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class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Metric tire codes</span> </div> </a> <button aria-controls="toc-Metric_tire_codes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Metric tire codes subsection</span> </button> <ul id="toc-Metric_tire_codes-sublist" class="vector-toc-list"> <li id="toc-Vehicle_Class" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Vehicle_Class"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Vehicle Class</span> </div> </a> <ul id="toc-Vehicle_Class-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Section_Width" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Section_Width"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Section Width</span> </div> </a> <ul id="toc-Section_Width-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Slash" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Slash"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Slash</span> </div> </a> <ul id="toc-Slash-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Aspect_Ratio" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Aspect_Ratio"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Aspect Ratio</span> </div> </a> <ul id="toc-Aspect_Ratio-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Construction" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Construction"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.5</span> <span>Construction</span> </div> </a> <ul id="toc-Construction-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Diameter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Diameter"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.6</span> <span>Diameter</span> </div> </a> <ul id="toc-Diameter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Load_Index_and_Load_Range" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Load_Index_and_Load_Range"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.7</span> <span>Load Index and Load Range</span> </div> </a> <ul id="toc-Load_Index_and_Load_Range-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Speed_rating" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Speed_rating"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.8</span> <span>Speed rating</span> </div> </a> <ul id="toc-Speed_rating-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Other_codes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Other_codes"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Other codes</span> </div> </a> <button aria-controls="toc-Other_codes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Other codes subsection</span> </button> <ul id="toc-Other_codes-sublist" class="vector-toc-list"> <li id="toc-Wear,_Traction,_and_Temperature_Grades" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Wear,_Traction,_and_Temperature_Grades"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Wear, Traction, and Temperature Grades</span> </div> </a> <ul id="toc-Wear,_Traction,_and_Temperature_Grades-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-DOT_code" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#DOT_code"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>DOT code</span> </div> </a> <ul id="toc-DOT_code-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-E-mark" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#E-mark"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>E-mark</span> </div> </a> <ul id="toc-E-mark-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Light_truck_(LT)_tire_codes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Light_truck_(LT)_tire_codes"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Light truck (LT) tire codes</span> </div> </a> <button aria-controls="toc-Light_truck_(LT)_tire_codes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Light truck (LT) tire codes subsection</span> </button> <ul id="toc-Light_truck_(LT)_tire_codes-sublist" class="vector-toc-list"> <li id="toc-Load_range" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Load_range"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Load range</span> </div> </a> <ul id="toc-Load_range-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Wheel/rim_widths" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Wheel/rim_widths"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Wheel/rim widths</span> </div> </a> <ul id="toc-Wheel/rim_widths-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Additional_marks" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Additional_marks"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Additional marks</span> </div> </a> <ul id="toc-Additional_marks-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Tire_geometry" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Tire_geometry"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Tire geometry</span> </div> </a> <button aria-controls="toc-Tire_geometry-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Tire geometry subsection</span> </button> <ul id="toc-Tire_geometry-sublist" class="vector-toc-list"> <li id="toc-Examples" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Examples"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Examples</span> </div> </a> <ul id="toc-Examples-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Historical_tire_codes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Historical_tire_codes"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Historical tire codes</span> </div> </a> <button aria-controls="toc-Historical_tire_codes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Historical tire codes subsection</span> </button> <ul id="toc-Historical_tire_codes-sublist" class="vector-toc-list"> <li id="toc-North_America" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#North_America"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.1</span> <span>North America</span> </div> </a> <ul id="toc-North_America-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> 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<div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Alphanumeric code specifying tire sizes and limits</div> <p class="mw-empty-elt"> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Tire_code_-_en.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Tire_code_-_en.svg/220px-Tire_code_-_en.svg.png" decoding="async" width="220" height="169" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Tire_code_-_en.svg/330px-Tire_code_-_en.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/be/Tire_code_-_en.svg/440px-Tire_code_-_en.svg.png 2x" data-file-width="1300" data-file-height="1000" /></a><figcaption>Tire identification labels</figcaption></figure> <p>Automotive <a href="/wiki/Tire" title="Tire">tires</a> are described by several alphanumeric <b>tire codes</b> (in <a href="/wiki/North_American_English" title="North American English">North American English</a>) or <b>tyre codes</b> (in <a href="/wiki/English_in_the_Commonwealth_of_Nations" title="English in the Commonwealth of Nations">Commonwealth English</a>), which are generally molded into the <a href="/wiki/Sidewall" class="mw-redirect" title="Sidewall">sidewall</a> of the tire. These codes specify the dimensions of the tire and its key limitations, such as load-bearing ability and maximum speed. Sometimes the inner sidewall contains information not included on the outer sidewall, and vice versa. </p><p>The code has grown in complexity over the years, as is evident from the mix of <a href="/wiki/SI" class="mw-redirect" title="SI">SI</a> and <a href="/wiki/United_States_customary_units" title="United States customary units">USC</a> units, and ad-hoc extensions to lettering and numbering schemes. </p><p>Most passenger car tires sizes are given using either the P Metric tire sizing system or the Metric tire sizing system (which is based on ISO standards but is not to be confused with the <a href="/wiki/International_System_of_Units" title="International System of Units">ISO metric system</a>). <a href="/wiki/Pickup_trucks" class="mw-redirect" title="Pickup trucks">Pickup trucks</a> and <a href="/wiki/SUV" title="SUV">SUVs</a> use the Light Truck Numeric or Light Truck High Flotation system. Heavy trucks and commercial vehicles use another system altogether. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="ETRTO,_TRA,_and_JATMA"><span id="ETRTO.2C_TRA.2C_and_JATMA"></span>ETRTO, TRA, and JATMA</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=1" title="Edit section: ETRTO, TRA, and JATMA"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/European_Tyre_and_Rim_Technical_Organisation" title="European Tyre and Rim Technical Organisation">European Tyre and Rim Technical Organisation</a> (ETRTO) and the Tire and Rim Association (TRA), formerly known as The Tire and Rim Association of America, Inc.,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> are two organizations that influence national tire standards. There exists also the Japan Automobile Tyre Manufacturers' Association, Inc. (JATMA). In practice, the standards of the three organizations have evolved together and are fairly interchangeable, though the load and inflation tables will give slightly different values for the same size tire.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>In the United States, the Office of Vehicle Safety Compliance, a component of the Department of Transportation, is one of the agencies tasked to enforce the Federal Motor Vehicle Safety Standard (FMVSS).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Canada has published tire regulations, such as the Motor Vehicle Tire Safety Regulations SOR 95-148.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Tire-code.jpg" class="mw-file-description"><img alt="Shows an example of a tire code" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Tire-code.jpg/220px-Tire-code.jpg" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Tire-code.jpg/330px-Tire-code.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/38/Tire-code.jpg/440px-Tire-code.jpg 2x" data-file-width="1024" data-file-height="576" /></a><figcaption>Metric tire code example</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="Metric_tire_codes">Metric tire codes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=2" title="Edit section: Metric tire codes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The metric tire code consists of a string of letters and numbers describing the dimensions of the tire, as follows:<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-etrto.org_6-0" class="reference"><a href="#cite_note-etrto.org-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Vehicle_Class">Vehicle Class</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=3" title="Edit section: Vehicle Class"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An optional letter (or letters) indicating the intended use or vehicle class for the tire: </p> <ul><li><b>P</b>: Passenger Car</li> <li><b>LT</b>: Light Truck</li> <li><b>C:</b> Commercial trucks</li> <li><b>ST</b>: Special Trailer</li> <li><b>T</b>: Temporary (restricted usage for "space-saver" spare wheels)</li> <li>A preceding "P" indicates that the tire loads are designed to TRA standards, while the absence of a letter indicates that the tire conforms to ETRTO standards.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Section_Width">Section Width</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=4" title="Edit section: Section Width"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A 3-digit number indicating the "nominal section width" of the tire in millimeters; the widest point from both outer edges (side wall to side wall). The tire surface that touches the road usually has a narrower width (called "tread width"). </p> <div class="mw-heading mw-heading3"><h3 id="Slash">Slash</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=5" title="Edit section: Slash"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A slash "/" character for character separation. </p> <div class="mw-heading mw-heading3"><h3 id="Aspect_Ratio">Aspect Ratio</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=6" title="Edit section: Aspect Ratio"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A 2- or 3-digit number indicating the "aspect ratio" of the sidewall height as a percentage of the nominal section width of the tire. If the information is omitted, it is assumed to be 82%. However, if the number is larger than 200, then this is the diameter of the entire tire in millimeters. </p> <div class="mw-heading mw-heading3"><h3 id="Construction">Construction</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=7" title="Edit section: Construction"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An optional letter or two indicating construction of the fabric carcass of the tire: </p> <ul><li><b>B</b>: bias belt (where the sidewalls are the same material as the tread, leading to a rigid ride)</li> <li><b>D</b>: diagonal</li> <li><b>R</b>: <a href="/wiki/Radial_tire" title="Radial tire">radial</a></li> <li>if omitted, it is a cross-ply tire</li> <li>The R in a radial tire may be preceded by an optional letter indicating the <a href="#Speed_rating">speed rating</a> of the tire according to a deprecated naming system. This letter can be ignored as the actual speed rating is given by the letter appearing at the end of the metric tire code, following the <a href="#Load_index">load index</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Diameter">Diameter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=8" title="Edit section: Diameter"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A 1- or 2-digit number indicating the diameter, in inches, of the rim that the tires are designed to fit. There is the rare exception of metric-diameter tires, such as the use of the 390 size, which in this case would indicate a rim of 390 mm in diameter. Few tires are made to this size currently. The number may be longer where a half-inch size is used, for example many heavy transport trucks now use 22.5-inch tires.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Load_Index_and_Load_Range">Load Index and Load Range</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=9" title="Edit section: Load Index and Load Range"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The load index on a passenger-car tire is a two- or three-digit numerical code used to cross-reference a load & inflation table that will give the maximum load each tire can carry at a given pressure. </p><p>The load index is sometimes used in conjunction with the load range, which appears elsewhere on the tire. It usually consists of two letters (usually LL for Light Load, SL for Standard Load, and XL for Extra Load). However, it may also be written out as "EXTRA LOAD." It may also be absent entirely, which indicates a Standard Load tire. </p><p>These two codes allow one to look up the required <a href="/wiki/Cold_inflation_pressure" title="Cold inflation pressure">cold inflation pressure</a> to carry a given load, according to the load inflation charts or tables. The load tables are too large to include in this article, but may be found at tirepressure.org.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Generally, tire codes with a preceding "P" shall reference the P Metric Tire Load Inflation Chart, while those without shall reference the Metric Tire Load Inflation Chart. </p> <div class="mw-heading mw-heading3"><h3 id="Speed_rating">Speed rating</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=10" title="Edit section: Speed rating"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The speed symbol is made up of a single letter, or an A with one numeral. It is indicative of the maximum speed at which the tire can carry its rated load while ensuring that no part of the tire overheats when operating in steady-state conditions on smooth roads.<sup id="cite_ref-etrto.org_6-1" class="reference"><a href="#cite_note-etrto.org-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <caption><b>Speed rating<sup id="cite_ref-etrto.org_6-2" class="reference"><a href="#cite_note-etrto.org-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></b> </caption> <tbody><tr> <th><b>Code</b> </th> <td><b>km/h</b> </td> <td><b>mph</b> </td> <td> </td> <th><b>Code</b> </th> <td><b>km/h</b> </td> <td><b>mph</b> </td></tr> <tr> <th>A1 </th> <td>5 </td> <td>3 </td> <td> </td> <th>L </th> <td>120 </td> <td>75 </td></tr> <tr> <th>A2 </th> <td>10 </td> <td>6 </td> <td> </td> <th>M </th> <td>130 </td> <td>81 </td></tr> <tr> <th>A3 </th> <td>15 </td> <td>9 </td> <td> </td> <th>N </th> <td>140 </td> <td>87 </td></tr> <tr> <th>A4 </th> <td>20 </td> <td>12 </td> <td> </td> <th>P </th> <td>150 </td> <td>94 </td></tr> <tr> <th>A5 </th> <td>25 </td> <td>16 </td> <td> </td> <th>Q </th> <td>160 </td> <td>100 </td></tr> <tr> <th>A6 </th> <td>30 </td> <td>19 </td> <td> </td> <th>R </th> <td>170 </td> <td>106 </td></tr> <tr> <th>A7 </th> <td>35 </td> <td>22 </td> <td> </td> <th>S </th> <td>180 </td> <td>112 </td></tr> <tr> <th>A8 </th> <td>40 </td> <td>25 </td> <td> </td> <th>T </th> <td>190 </td> <td>118 </td></tr> <tr> <th>B </th> <td>50 </td> <td>31 </td> <td> </td> <th>U </th> <td>200 </td> <td>124 </td></tr> <tr> <th>C </th> <td>60 </td> <td>37 </td> <td> </td> <th>H </th> <td>210 </td> <td>130 </td></tr> <tr> <th>D </th> <td>65 </td> <td>40 </td> <td> </td> <th>V </th> <td>240 </td> <td>149 </td></tr> <tr> <th>E </th> <td>70 </td> <td>43 </td> <td> </td> <th>Z </th> <td>over 240 </td> <td>over 149 </td></tr> <tr> <th>F </th> <td>80 </td> <td>50 </td> <td> </td> <th>W </th> <td>270 </td> <td>168 </td></tr> <tr> <th>G </th> <td>90 </td> <td>56 </td> <td> </td> <th>(W) </th> <td>over 270 </td> <td>over 168 </td></tr> <tr> <th>J </th> <td>100 </td> <td>62 </td> <td> </td> <th>Y </th> <td>300 </td> <td>186 </td></tr> <tr> <th>K </th> <td>110 </td> <td>68 </td> <td> </td> <th>(Y) </th> <td>over 300 </td> <td>over 186 </td></tr></tbody></table> <p>Speed ratings of S and above have certain constraints that must be met in order to reach their maximum speeds. Namely, their operating pressures must be adjusted according to the table below.<sup id="cite_ref-etrto.org_6-3" class="reference"><a href="#cite_note-etrto.org-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <tbody><tr> <td>Speed Rating </td> <td>Max Speed S1 without pressure adjustment (km/h) </td> <td>Pressure adjustment for every 10 km/h over S1 (kPa) </td> <td>Maximum Speed S2 without load reduction (km/h) </td> <td>Load reduction for every 10 km/h over S2 (kg) </td> <td>Maximum Speed (km/h) </td></tr> <tr> <td>S </td> <td>160 </td> <td>5 </td> <td>180 </td> <td>0% </td> <td>180 </td></tr> <tr> <td>T </td> <td>160 </td> <td>7 </td> <td>190 </td> <td>0% </td> <td>190 </td></tr> <tr> <td>H </td> <td>160 </td> <td>6 </td> <td>210 </td> <td>0% </td> <td>210 </td></tr> <tr> <td>V </td> <td>160 </td> <td>6 </td> <td>210 </td> <td>3% </td> <td>240 </td></tr> <tr> <td>W </td> <td>190 </td> <td>10 </td> <td>240 </td> <td>5% </td> <td>270 </td></tr> <tr> <td>Y </td> <td>220 </td> <td>10 </td> <td>270 </td> <td>5% </td> <td>300 </td></tr></tbody></table> <p>Speed ratings with parentheses such as (W) and (Y) have maximum speeds set by the manufacturers. The load rating is often included within the parentheses, e.g. (86Y). </p><p>Prior to 1991, tire speed ratings were shown inside the tire size, before the "R" construction type. The available codes were SR (180 km/h, 112 mph), HR (210 km/h, 130 mph), VR (in excess of 210 km/h, 130 mph), and ZR (in excess of 240 km/h, 150 mph). </p><p>In many countries, the law requires that tires must be specified, and fitted, to exceed the maximum speed of the vehicle they are mounted on, with regards to their speed rating code (except for "temporary-use" spare tires). In some parts of the <a href="/wiki/European_Union" title="European Union">European Union</a>, tires that are not fit for a car's or motorcycle's particular maximum speed are illegal to mount. The sole exception are M+S tires, where a warning sticker stating the allowed maximum speed must be placed within clear sight of the driver inside the vehicle. Some manufacturers will install a <a href="/wiki/Speed_limiter" title="Speed limiter">speed governor</a> if a vehicle is ordered with tires rated below the vehicle's maximum speed. In some parts of the European Union, e.g. Germany, it is allowed to mount tires with a lower speed rating code if the car manufacturer specifies tires with a very high speed rating in the registration documents and the vehicle will not reach this speed based on insufficient power.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> In this case it is possible to calculate the appropriate speed rating with a formula.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Other_codes">Other codes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=11" title="Edit section: Other codes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Wear,_Traction,_and_Temperature_Grades"><span id="Wear.2C_Traction.2C_and_Temperature_Grades"></span>Wear, Traction, and Temperature Grades</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=12" title="Edit section: Wear, Traction, and Temperature Grades"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:UTQG_ratings_on_Japanese_Tire.jpg" class="mw-file-description"><img alt="Example UTQG ratings shown on a tire" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/UTQG_ratings_on_Japanese_Tire.jpg/220px-UTQG_ratings_on_Japanese_Tire.jpg" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/UTQG_ratings_on_Japanese_Tire.jpg/330px-UTQG_ratings_on_Japanese_Tire.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/93/UTQG_ratings_on_Japanese_Tire.jpg/440px-UTQG_ratings_on_Japanese_Tire.jpg 2x" data-file-width="1920" data-file-height="1080" /></a><figcaption>Example UTQG ratings on a tire</figcaption></figure> <p>The wear, traction, and temperature characteristics of passenger tires are displayed according to the <a href="/wiki/Uniform_Tire_Quality_Grading" title="Uniform Tire Quality Grading">Uniform Tire Quality Grading</a> (UTQG) standard. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:DOT_tire_code.jpg" class="mw-file-description"><img alt="An example DOT tire code" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/DOT_tire_code.jpg/220px-DOT_tire_code.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/DOT_tire_code.jpg/330px-DOT_tire_code.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/DOT_tire_code.jpg/440px-DOT_tire_code.jpg 2x" data-file-width="660" data-file-height="440" /></a><figcaption>An example DOT tire code</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="DOT_code">DOT code</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=13" title="Edit section: DOT code"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The DOT code can be found immediately after the letters "DOT" on a tire sidewall. </p><p>It is useful in identifying tires subject to <a href="/wiki/Product_recall" title="Product recall">product recall</a><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> or at end of life due to age. It is mandated by the <a href="/wiki/United_States_Department_of_Transportation" title="United States Department of Transportation">U.S. Department of Transportation</a><sup id="cite_ref-DoT_13-0" class="reference"><a href="#cite_note-DoT-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> but is used worldwide.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p><p>The first three characters indicate the manufacturing plant and are assigned by the NHTSA<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> (tires made before 2015 had only two characters). </p><p>Following the manufacturer's plant code, the next two digits within a DOT code signify the tire size. For instance, the size code "WC" might correspond to the tire size 205/55 R16. However, these size codes aren't standardized. Each tire manufacturer may assign these codes as they see fit, provided they maintain a consistent and explainable system within their coding. </p><p>After the size code, the next sequence in a DOT number consists of three or four digits that designate the tire type. This coding, though optional, is widely used by tire manufacturers for internal tracking purposes, such as managing returns and quality control. The decision on how exactly to code the tire type lies with each manufacturer, leading to a variety of coding systems across the industry. </p><p>The last four numbers of the DOT marking on tires tell you the week (1 through 52) and year the tire was made. So, a tire with the last four digits of 0121 was made the first week of January 2021, 0221 is second week of January of 2021, and so on. </p> <div class="mw-heading mw-heading3"><h3 id="E-mark">E-mark</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=14" title="Edit section: E-mark"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>All tires sold for road use in Europe after July 1997 must carry an E-mark. The mark itself is either an upper case "E" or lower case "e" – followed by a number in a circle or rectangle, followed by a further number. An (upper case) "E" indicates that the tire is certified to comply with the dimensional, performance and marking requirements of <a href="/wiki/ECE_Regulation" class="mw-redirect" title="ECE Regulation">ECE Regulation</a> 30. A (lower case) "e" indicates that the tire is certified to comply with the dimensional, performance and marking requirements of Directive 92/23/EEC. The number in the circle or rectangle denotes the country code of the government that granted the type approval. The last number outside the circle or rectangle is the number of the type approval certificate issued for that particular tire size and type.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Light_truck_(LT)_tire_codes"><span id="Light_truck_.28LT.29_tire_codes"></span>Light truck (LT) tire codes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=15" title="Edit section: Light truck (LT) tire codes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><span class="anchor" id="Light_truck_(LT)_sizes"></span><span class="anchor" id="Light_truck_(LT)_tire_sizes"></span><span class="anchor" id="Light_truck_(LT)_tire_codes"></span><span class="anchor" id="Light_truck_(LT)_tires"></span> </p> <figure class="mw-halign-right" typeof="mw:File/Frame"><a href="/wiki/File:Tirecode-lt.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/a/ae/Tirecode-lt.gif" decoding="async" width="288" height="287" class="mw-file-element" data-file-width="288" data-file-height="287" /></a><figcaption>Tire identification diagram, light truck specific features</figcaption></figure> <p>Flotation tires keep vehicle tires floating above loosely packed dirt, minimizing soil disturbance in agricultural environments and maximizing vehicle stability on unpaved surfaces in construction environments. </p><p><a href="/wiki/Light_truck" title="Light truck">Light truck</a> tires are indicated by the letters LT at the end instead of the beginning of the sequence, as follows: </p> <ul><li>The tire diameter is given for High Flotation tires and omitted from Numeric tires. <ul><li><b>2-digit number</b>: The diameter of the tire in inches.</li> <li><b>x</b>: Separator character.</li></ul></li> <li><b>3- or 4-digit number</b>: The section width (cross-section) of the tire in inches. If the tire diameter is not given, section widths ending in zero (e.g., 7.00 or 10.50) indicate the aspect ratio of 92%, while section widths not ending in zero (e.g., 7.05 or 10.55) indicate the aspect ratio of 82%. These aspect ratios often vary from today's tire manufacturer specification.</li> <li>Construction of the fabric of the tire: <ul><li><b>B</b>: bias belt</li> <li><b>D</b>: diagonal</li> <li><b>R</b>: radial</li></ul></li> <li><b>2-digit number</b>: Diameter in inches of the rim that this tire is designed to fit.</li> <li><b>LT</b>: Designates that this is a light truck tire.</li> <li>Load index and speed rating are sometimes not mandatory for flotation sizes, but must be for any tire approved for street and highway use. <ul><li><b>2- or 3-digit number</b>: Load index; see table below.</li> <li><b>1- or 2-digit/letter combination</b>: Speed rating; see table below.</li></ul></li> <li>Additional marks: see subheading below.</li></ul> <p>As an example, if a tire size has two sets of numbers (6-12, 5.00-15, 11.2-24), then the first number (<b>5.00</b>-15) is the approximate width in inches, and the second number (5.00-<b>15</b>) is the rim diameter in inches. </p><p>If a tire size has three sets of numbers (15x6.00-6, 26x12.00-12, 31x15.50-15), then the first number (<b>26</b>x12.00-12) is the approximate tire diameter in inches, the second number (26x<b>12.00</b>-12) is the approximate width in inches, and the third number (26x12.00-<b>12</b>) is the rim diameter in inches.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Load_range">Load range</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=16" title="Edit section: Load range"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The load range letter on light-truck tires indicates their ply rating.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <tbody><tr> <th>Load range </th> <th>Ply rating </th></tr> <tr> <td>A </td> <td>2 </td></tr> <tr> <td>B </td> <td>4 </td></tr> <tr> <td>C </td> <td>6 </td></tr> <tr> <td>D </td> <td>8 </td></tr> <tr> <td>E </td> <td>10 </td></tr> <tr> <td>F </td> <td>12 </td></tr> <tr> <td>G </td> <td>14 </td></tr> <tr> <td>H </td> <td>16 </td></tr> <tr> <td>J </td> <td>18 </td></tr> <tr> <td>L </td> <td>20 </td></tr> <tr> <td>M </td> <td>22 </td></tr> <tr> <td>N </td> <td>24 </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Wheel/rim_widths"><span id="Wheel.2Frim_widths"></span>Wheel/rim widths</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=17" title="Edit section: Wheel/rim widths"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>To determine the allowable range of rim widths for a specific tire size, the TRA Yearbook or the manufacturer's guide should always be consulted for that specific tire – there is no <a href="/wiki/Rule_of_thumb" title="Rule of thumb">rule of thumb</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> Running a tire on a rim size or type not approved by its manufacturer can result in tire failure and a loss of vehicle control. </p> <div class="mw-heading mw-heading2"><h2 id="Additional_marks">Additional marks</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=18" title="Edit section: Additional marks"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are numerous other markings on a typical tire, these may include: </p> <ul><li><b>"*"</b>: BMW-Mini original manufacturer fitment</li> <li><b>030908</b>: Approval number of the tire</li> <li><b>"100T"</b>: Commonly appears after tire size. Meaning: standard load inflation table (100) & speed rating (T)</li> <li><b>AMx</b>: <a href="/wiki/Aston_Martin" title="Aston Martin">Aston Martin</a> OE Fitments<sup id="cite_ref-Bridgestone_Glossary_20-0" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>"AO"</b>: Audi original manufacturer fitment</li> <li><b>Arrows</b>: Some tread designs are "directional", and designed to perform better when driven in a specific direction. Such tires will have an arrow showing which way the tire should rotate when the vehicle is moving forwards.</li> <li><b>B</b>: Bias belted; tires for motorcycles (Example: 150/70 B 17 69 H) – diagonal construction with belt added under the tread</li> <li><b>BSB</b>: Broken serrated band</li> <li><b>BSL</b>: Black serrated letters</li> <li><b>BSW</b>: Black sidewall</li> <li><b>E4</b>: Tire approved according to the ECE-regulations, the number indicating the country of approval.</li> <li><b>"ELT"</b>: Pirelli Elect tyres, specific for electric car</li> <li><b>"J"</b>: Jaguar original manufacturer fitment</li> <li><b>LL</b>: Light load; tires for light usage and loads</li> <li><b>"M/C"</b>: Only for motorcycle fitment</li> <li><b>M+S</b>, or <b>M&S</b>: Mud and snow; A tire that meets the <a href="/wiki/Rubber_Manufacturers_Association" title="Rubber Manufacturers Association">Rubber Manufacturers Association</a> (RMA) and Rubber Association of Canada (RAC) all-season tire definition.<sup id="cite_ref-Bridgestone_Glossary_20-1" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> These are commonly found on all-season tires, with self-cleaning tread and average traction in muddy or very snowy conditions, and for low temperatures. Spike tires have an additional letter, "E" (M+SE).</li> <li><b>A/T</b> or <b>AT</b>: All Terrain; Designed for all conditions on and off road, master of none</li> <li><b>M+T</b> or <b>M&T</b>: Mud and terrain; Designed to perform in mud or on other terrain that requires additional traction such as on rocks, in deeper snow, and in loose gravel.</li> <li><b>M/T</b> or <b>MT</b>: Mud Terrain; Designed for deep mud and <a href="/wiki/Rock_crawling" title="Rock crawling">rock crawl</a></li> <li><b>Made in ...</b>: Country of production</li> <li><b>MGT</b>: Maserati Genuine Tire. Original tires for <a href="/wiki/Maserati" title="Maserati">Maserati</a></li> <li><b>MO</b>: Original tires for <a href="/wiki/Mercedes-Benz" title="Mercedes-Benz">Mercedes-Benz</a></li> <li><b>MOE</b>: <a href="/wiki/Mercedes-Benz" title="Mercedes-Benz">Mercedes-Benz</a> Original Extended mobility (sometimes incorrectly<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> referred to as a <a href="/wiki/Run-flat_tire" title="Run-flat tire">Run-flat tire</a>)<sup id="cite_ref-Bridgestone_Glossary_20-2" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>Mountain snowflake pictograph</b>: Winter passenger and light truck tires that meet the severe snow service requirements of Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC).<sup id="cite_ref-Bridgestone_Glossary_20-3" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>N-x</b>: Original tires for <a href="/wiki/Porsche" title="Porsche">Porsche</a> where "x" is a "0" for the first approved in that size, "1" the second, ...<sup id="cite_ref-Bridgestone_Glossary_20-4" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>"NHS"</b>: Not highway service</li> <li><b>ORWL</b>: Outlined raised white lettering</li> <li><b>OWL</b>: Outlined white lettering</li> <li><b>RF</b>: Reinforced – for Euro-metric tires, the term 'reinforced' means the same thing as 'extra load'<sup id="cite_ref-Bridgestone_Glossary_20-5" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>RFT</b>: Run-flat tire; Tires designed for vehicles without spare tires. Reinforced sidewalls allow the tire to be driven "flat" for a distance specified by the manufacturer (usually 50 miles)</li> <li><b>RSC (inside a circle)</b>: <a href="/wiki/BMW" title="BMW">BMW</a> runflat system component<sup id="cite_ref-Bridgestone_Glossary_20-6" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>RWL</b>: Raised white lettering <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Examples_of_different_tire_sidewall_markings.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Examples_of_different_tire_sidewall_markings.png/550px-Examples_of_different_tire_sidewall_markings.png" decoding="async" width="550" height="153" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Examples_of_different_tire_sidewall_markings.png/825px-Examples_of_different_tire_sidewall_markings.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Examples_of_different_tire_sidewall_markings.png/1100px-Examples_of_different_tire_sidewall_markings.png 2x" data-file-width="1482" data-file-height="411" /></a><figcaption>Examples of different tire sidewall markings</figcaption></figure></li> <li><b>SFI</b>, or <b>Inner</b>: side facing inward; inside of <a href="/wiki/Asymmetric_tire" class="mw-redirect" title="Asymmetric tire">asymmetric tires</a></li> <li><b>SFO</b>, or <b>Outer</b>: side facing outward; outside of asymmetric tires</li> <li><b>SL</b>: Standard load; tire for normal usage and loads</li> <li><b>Star</b>: Original tires for <a href="/wiki/BMW" title="BMW">BMW</a></li> <li><b>TL</b>: Tubeless</li> <li><b>TPC</b>: <a href="/wiki/General_Motors" title="General Motors">General Motors</a> OE fitments<sup id="cite_ref-Bridgestone_Glossary_20-7" class="reference"><a href="#cite_note-Bridgestone_Glossary-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li><b>TT</b>: Tube-type, tire must be used with an inner-tube</li> <li><b>TWI</b>: Tread wear indicator – a device, such as a triangle or a small <a href="/wiki/Michelin_Man" title="Michelin Man">Michelin Man</a> icon, located where the tread meets the sidewall, and indicating the location of the raised wear bars in the tire tread channels – <b>TWI</b> is also used to refer to the raised wear bars themselves.</li> <li><b>VSB</b>: Vertical serrated band</li> <li><b>WSW</b>: White sidewall</li> <li><b>XL</b>: extra load; a tire that allows a higher inflation pressure than a standard load tire, which increases the tire's maximum load</li> <li><b>ZP</b>: zero-pressure; Michelin's branding for their run-flat models.</li> <li>To facilitate proper balancing, most tire manufacturers also mark red circles (uniformity) and/or yellow dots (weight) on the sidewalls of their tires to enable the best possible match-mounting of the tire/wheel assembly.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Tire_geometry">Tire geometry</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=19" title="Edit section: Tire geometry"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When referring to the purely geometrical data, a shortened form of the full notation is used. To take a common example, <b>195/55R16</b> would mean that the nominal width of the tire is approximately 195 mm at the widest point, the height of the side-wall of the tire is 55% of the width (107 mm in this example) and that the tire fits 16-inch-diameter (410 mm) rims. The code gives a direct calculation of the theoretical diameter of the tire. For a size shown as "T/A_W" use (2×T×A/100) + (W×25.4) for a result in millimeters or (T*A/1270)+ W for a result in inches. Take the common example used above; (2×195×55/100)+(16×25.4) = 621 mm or (195×55/1270)+16 = 24.44 inches. </p><p>Less commonly used in the US and Europe (but often in Japan for example) is a notation that indicates the full tire diameter instead of the aspect ratio of the side-wall height. To take the same example, a 16-inch rim would have a diameter of 406 mm. Adding twice the tire height (2×107 mm) makes a total 620 mm tire diameter. Hence, a <b>195/55R16</b> tire might alternatively be labelled <b>195/620R16</b>. </p><p>Whilst this is theoretically ambiguous, in practice these two notations may easily be distinguished because the height of the side-wall of an automotive tire is typically much less than the width. Hence when the height is expressed as a percentage of the width, it is almost always less than 100% (and certainly less than 200%). Conversely, vehicle tire diameters are always larger than 200 mm. Therefore, if the second number is more than 200, then it is almost certain the Japanese notation is being used – if it is less than 200 then the U.S./European notation is being used. </p><p>The diameters referred to above are the theoretical diameter of the tire. The actual diameter of a specific tire size can only be found in the TRA Yearbook or the manufacturer's data books.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> Note that the tire's cross-section and diameter are always specified when measured on a rim of a specified width; different widths will yield different tire dimensions. </p> <div class="mw-heading mw-heading3"><h3 id="Examples">Examples</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=20" title="Edit section: Examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The tires on a <a href="/wiki/BMW_MINI" class="mw-redirect" title="BMW MINI">BMW Mini Cooper</a> might be labeled: <i>P195/55R16 85H</i> </p> <ul><li>P – these tires are for a passenger vehicle. However 'P' denotes P metric size load and speed rating changes for P tire & non-P tires</li> <li>195 – the nominal width of the tire is approximately 195 mm at the widest point</li> <li>55 – indicates that the height of the sidewall of the tire is 55% of the width (107 mm)</li> <li>R – this is a radial tire</li> <li>16 – this tire fits 16 in (410 mm) rims</li> <li>85 – the load index, a maximum of 515 kg (1,135 lb) per tire in this case</li> <li>H – the speed index, this means the maximum permitted speed, here 210 km/h (130 mph)</li></ul> <p>The tires on a <a href="/wiki/Hummer_H1" title="Hummer H1">Hummer H1</a> might be labeled: <i>37X12.5R17LT</i> </p> <ul><li>37 – the tire is 37 in (940 mm) in diameter</li> <li>12.5 – the tire has a cross section of 12.5 in (320 mm)</li> <li>R – this is a radial tire</li> <li>17 – this tire fits 17 in (430 mm) rims</li> <li>LT – this is a light truck tire</li></ul> <div class="mw-heading mw-heading2"><h2 id="Historical_tire_codes">Historical tire codes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=21" title="Edit section: Historical tire codes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="North_America">North America</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=22" title="Edit section: North America"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, <b>6.50-15</b>.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p><p>From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches. To differentiate from the earlier 90-ratio tires, the decimal point is usually omitted from the width – for example, <b>685-15</b> for a tire 6.85 inches wide. </p><p>Starting in 1972 tires were specified by load rating, using a letter code. In practice, a higher load rating tire was also a wider tire. In this system a tire had a letter, optionally followed by "R" for radial tires, followed by the aspect ratio, a dash and the diameter – <b>C78-15</b> or <b>CR78-15</b> for bias and radial, respectively. Each diameter of rim had a separate sequence of load ratings; thus, a C78-14 and a C78-15 are not the same width. An aspect ratio of 78% was typical for letter-sized tires, although 70% was also common and lower profiles down to 50% were occasionally seen.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=23" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Bicycle_tire" title="Bicycle tire">Bicycle tire</a></li> <li><a href="/wiki/Motorcycle_tyre" title="Motorcycle tyre">Motorcycle tyre</a></li> <li><a href="/wiki/Plus_sizing" title="Plus sizing">Plus sizing</a></li> <li><a href="/wiki/Speedometer#Error" title="Speedometer">Speedometer errors</a> induced by variations in tire size.</li> <li><a href="/wiki/Tire_manufacturing" title="Tire manufacturing">Tire manufacturing</a></li> <li><a href="/wiki/Uniform_Tire_Quality_Grading" title="Uniform Tire Quality Grading">Uniform Tire Quality Grading (UTQG)</a></li> <li><a href="/wiki/Wheel_sizing" title="Wheel sizing">Wheel sizing</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=24" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.us-tra.org/traAbout.html">Scope of the Association and Some of its History</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100303220431/http://www.us-tra.org/traAbout.html">Archived</a> 2010-03-03 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, The Tire and Rim Association. Retrieved 2010-01-04.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.dunloptires.com/care/tech.html">Care and Maintenance - Technical</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100115092140/http://dunloptires.com/care/tech.html">Archived</a> 2010-01-15 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, Dunlop Tires. Retrieved 2010-01-05.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.nhtsa.dot.gov/staticfiles/DOT/NHTSA/Vehicle%20Safety/Test%20Procedures/Associated%20Files/TP120-03.pdf">Laboratory Test Procedure for FMVSS 120</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090702224742/http://www.nhtsa.dot.gov/staticfiles/DOT/NHTSA/Vehicle%20Safety/Test%20Procedures/Associated%20Files/TP120-03.pdf">Archived</a> 2009-07-02 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, National Highway Traffic and Safety Administration, United States Department of Transportation, April 10, 2000. Retrieved 2010-01-05.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.canlii.org/en/ca/laws/regu/sor-95-148/latest/sor-95-148.html">Motor Vehicle Tire Safety Regulations SOR 95-148</a>, Canadian Legal Information Institute. 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Retrieved <span class="nowrap">May 20,</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.iso.org&rft.atitle=ISO+-+83.160.10+-+Road+vehicle+tyres&rft_id=https%3A%2F%2Fwww.iso.org%2Fics%2F83.160.10%2Fx%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-etrto.org-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-etrto.org_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-etrto.org_6-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-etrto.org_6-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-etrto.org_6-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMalinverni" class="citation web cs1">Malinverni, Pier Giovanni. <a rel="nofollow" class="external text" href="https://www.etrto.org/getattachment/About-us/History/ETRTO-MORE-THAN-50-YEARS-OF-STANDARDISATION-2015-03-25.pdf?lang=en-US">"More than 50 years of standardisation"</a> <span class="cs1-format">(PDF)</span>. <i>The European Tyre and Rim Technical Organisation</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+European+Tyre+and+Rim+Technical+Organisation&rft.atitle=More+than+50+years+of+standardisation&rft.aulast=Malinverni&rft.aufirst=Pier+Giovanni&rft_id=https%3A%2F%2Fwww.etrto.org%2Fgetattachment%2FAbout-us%2FHistory%2FETRTO-MORE-THAN-50-YEARS-OF-STANDARDISATION-2015-03-25.pdf%3Flang%3Den-US&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.drtheo.nl/CX/TRX-history.htm">A brief history of radial tires and the offbeat TRX system</a>, Michelin TRX, Dr. Theo Netherlands. Retrieved 2010-01-05.</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">Similarly, whilst most bicycle wheels have a diameter measured in inches, the 700mm wheel (=27.56") is increasingly common.</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://tirepressure.org/">"All Tire Pressures, Models, Tire Types and more"</a>. <i>tirepressure.org</i><span class="reference-accessdate">. Retrieved <span class="nowrap">November 11,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=tirepressure.org&rft.atitle=All+Tire+Pressures%2C+Models%2C+Tire+Types+and+more&rft_id=https%3A%2F%2Ftirepressure.org%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:31992L0023&rid=4">"Council Directive 92/23/EEC of 31 March 1992 relating to tyres for motor vehicles and their trailers and to their fitting"</a>. THE COUNCIL OF THE EUROPEAN COMMUNITIES<span class="reference-accessdate">. Retrieved <span class="nowrap">December 6,</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Council+Directive+92%2F23%2FEEC+of+31+March+1992+relating+to+tyres+for+motor+vehicles+and+their+trailers+and+to+their+fitting&rft.pub=THE+COUNCIL+OF+THE+EUROPEAN+COMMUNITIES&rft_id=http%3A%2F%2Feur-lex.europa.eu%2Flegal-content%2FEN%2FTXT%2FHTML%2F%3Furi%3DCELEX%3A31992L0023%26rid%3D4&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.auto-motor-oel.de/ratgeber/geschwindigkeitsindex-reifen/442/#Geschwindigkeitsindex-berechnen">"How to calculate speed ratings"</a>. 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Retrieved <span class="nowrap">December 6,</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=How+to+calculate+speed+ratings&rft.pub=Auto+Motor+%C3%96l&rft_id=http%3A%2F%2Fwww.auto-motor-oel.de%2Fratgeber%2Fgeschwindigkeitsindex-reifen%2F442%2F%23Geschwindigkeitsindex-berechnen&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.goodyear.com/en-US/tires/recall">"Goodyear Tire Recall - Goodyear Tires"</a>. <i>www.goodyear.com</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.goodyear.com&rft.atitle=Goodyear+Tire+Recall+-+Goodyear+Tires&rft_id=https%3A%2F%2Fwww.goodyear.com%2Fen-US%2Ftires%2Frecall&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-DoT-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-DoT_13-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.law.cornell.edu/cfr/text/49/574.5">"49 CFR 574.5 - Tire identification requirements."</a>.</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.rubbernews.com/article/20160309/NEWS/160309961/dept-of-transportation-issues-new-dot-codes">"Dept. of Transportation issues new DOT codes"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Dept.+of+Transportation+issues+new+DOT+codes&rft_id=https%3A%2F%2Fwww.rubbernews.com%2Farticle%2F20160309%2FNEWS%2F160309961%2Fdept-of-transportation-issues-new-dot-codes&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.wfirm.com/complete-list-of-tire-dot-plant-codes/">"Complete List of Tire DOT Codes by Manufacturer"</a>. <i>www.wfirm.com</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.wfirm.com&rft.atitle=Complete+List+of+Tire+DOT+Codes+by+Manufacturer&rft_id=https%3A%2F%2Fwww.wfirm.com%2Fcomplete-list-of-tire-dot-plant-codes%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJazar2013" class="citation book cs1">Jazar, Reza N. (November 19, 2013). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=IbW8BAAAQBAJ&q=european+tire+e+mark&pg=PA8"><i>Vehicle Dynamics: Theory and Application</i></a>. Springer Science & Business Media. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9781461485445" title="Special:BookSources/9781461485445"><bdi>9781461485445</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Vehicle+Dynamics%3A+Theory+and+Application&rft.pub=Springer+Science+%26+Business+Media&rft.date=2013-11-19&rft.isbn=9781461485445&rft.aulast=Jazar&rft.aufirst=Reza+N.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DIbW8BAAAQBAJ%26q%3Deuropean%2Btire%2Be%2Bmark%26pg%3DPA8&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.millertire.com/faqs/">"FAQ's"</a><span class="reference-accessdate">. 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Tire Rack.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=MERCEDES-BENZ+ORIGINAL+EXTENDED+TIRES&rft.pub=Tire+Rack&rft_id=https%3A%2F%2Fwww.tirerack.com%2Ftires%2Ftiretech%2Ftechpage.jsp%3Ftechid%3D234&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.yokohamatire.com/tires-101/maintenance-care-1/mounting-your-tires">"Tire care – Match mounting"</a>. Yokohama Tire Corporation.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Tire+care+%E2%80%93+Match+mounting&rft.pub=Yokohama+Tire+Corporation&rft_id=https%3A%2F%2Fwww.yokohamatire.com%2Ftires-101%2Fmaintenance-care-1%2Fmounting-your-tires&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text">"2010 Year Book", The Tire and Rim Association, Inc.</span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.vintagecarconnection.com/vintage_tire_size_conversion_chart.htm">"Vintage Tire Size Conversion Chart"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Vintage+Tire+Size+Conversion+Chart&rft_id=http%3A%2F%2Fwww.vintagecarconnection.com%2Fvintage_tire_size_conversion_chart.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.tirerack.com/tires/tiretech/45_conversionchart.html">"Tire Size Conversion Chart"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Tire+Size+Conversion+Chart&rft_id=http%3A%2F%2Fwww.tirerack.com%2Ftires%2Ftiretech%2F45_conversionchart.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATire+code" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Tire_code&action=edit&section=25" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://www.wfirm.com/complete-list-of-tire-dot-plant-codes">List of DOT codes</a>, Complete List of United States Tire DOT codes by manufacturer and plant</li> <li><a rel="nofollow" class="external text" href="http://www.nhtsa.dot.gov/cars/rules/TireSafety/ridesonit/brochure.html">Tire Safety</a>, United States Department of Transportation</li> <li><a rel="nofollow" class="external text" href="https://www.gov.uk/government/news/government-bans-old-coach-bus-and-lorry-tyres-from-roads-in-new-measures-to-improve-road-safety">UK Government bans tyres over 10 years</a>, United Kingdom Department of Transport</li> <li><a rel="nofollow" class="external text" href="https://tiresbook.com/how-long-tires-last/">Tires Lifespan and Tire Sidewall Code for Load Index</a>, Tires Book</li> <li><a rel="nofollow" class="external text" href="https://tirelib.com/">Tire Size Calculator and Conversion</a>, Tirelib</li> <li><a rel="nofollow" class="external text" href="https://www.tyrerunner.com/blog/we-are-the-size-of-your-palm-spare-a-little-time-for-us">Tire Safety checks</a>, Tyre Safety checks</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output 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.navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Tires" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Tires" title="Template:Tires"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Tires" title="Template talk:Tires"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Tires" title="Special:EditPage/Template:Tires"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Tires" style="font-size:114%;margin:0 4em"><a href="/wiki/Tire" title="Tire">Tires</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Types" title="Outline of tires">Types</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Tubeless_tire" title="Tubeless tire">Tubeless tire</a></li> <li><a href="/wiki/Radial_tire" title="Radial tire">Radial tire</a></li> <li><a href="/wiki/Low_rolling_resistance_tire" title="Low rolling resistance tire">Low rolling resistance tire</a></li> <li><a href="/wiki/Run-flat_tire" title="Run-flat tire">Run-flat tire</a></li> <li><a href="/wiki/Michelin_PAX_System" title="Michelin PAX System">Michelin PAX System</a></li> <li><a href="/wiki/Airless_tire" title="Airless tire">Airless tire</a></li> <li><a href="/wiki/Tweel" title="Tweel">Tweel</a></li> <li><a href="/wiki/Rain_tyre" title="Rain tyre">Rain tyre</a></li> <li><a href="/wiki/Snow_tire" title="Snow tire">Snow tire</a></li> <li><a href="/wiki/All-terrain_tire" class="mw-redirect" title="All-terrain tire">All-terrain tire</a></li> <li><a href="/wiki/Bar_grip" title="Bar grip">Bar grip</a></li> <li><a href="/wiki/Off-road_tire" title="Off-road tire">Knobby tire</a></li> <li><a href="/wiki/Off-roading#Large_tires" title="Off-roading">Large tire</a></li> <li><a href="/wiki/Mud-terrain_tyre" class="mw-redirect" title="Mud-terrain tyre">Mud-terrain tire</a></li> <li><a href="/wiki/Paddle_tire" title="Paddle tire">Paddle tire</a></li> <li><a href="/wiki/Orange_oil_tires" title="Orange oil tires">Orange oil tires</a></li> <li><a href="/wiki/Whitewall_tire" title="Whitewall tire">Whitewall tire</a></li> <li><a href="/wiki/Tire#Aircraft" title="Tire">Aircraft tire</a></li> <li><a href="/wiki/Tundra_tire" title="Tundra tire">Tundra tire</a></li> <li><a href="/wiki/Bicycle_tire" title="Bicycle tire">Bicycle tire</a></li> <li><a href="/wiki/Tubular_tire" class="mw-redirect" title="Tubular tire">Tubular tire</a></li> <li><a href="/wiki/Lego_tire" class="mw-redirect" title="Lego tire">Lego tire</a></li> <li><a href="/wiki/Motorcycle_tyre" title="Motorcycle tyre">Motorcycle tyre</a></li> <li><a class="mw-selflink-fragment" href="#Tractor_tires">Tractor tire</a></li> <li><a href="/wiki/Racing_slick" title="Racing slick">Racing slick</a></li> <li><a href="/wiki/Formula_One_tyres" title="Formula One tyres">Formula One tyres</a></li> <li><a href="/wiki/Spare_tire" title="Spare tire">Spare tire</a></li> <li><a href="/wiki/Continental_tire" title="Continental tire">Continental tire</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Components" title="Outline of tires">Components</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Tire_bead" title="Tire bead">Bead</a></li> <li><a href="/wiki/Beadlock" title="Beadlock">Beadlock</a></li> <li><a href="/wiki/Tire_tread" title="Tire tread">Tread</a></li> <li><a href="/wiki/Siping_(rubber)" title="Siping (rubber)">Siping (rubber)</a></li> <li><a href="/wiki/Valve_stem" title="Valve stem">Valve stem</a> <ul><li><a href="/wiki/Dunlop_valve" title="Dunlop valve">Dunlop valve</a></li> <li><a href="/wiki/Presta_valve" title="Presta valve">Presta valve</a></li> <li><a href="/wiki/Schrader_valve" title="Schrader valve">Schrader valve</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Attributes" title="Outline of tires">Attributes</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Camber_thrust" title="Camber thrust">Camber thrust</a></li> <li><a href="/wiki/Circle_of_forces" title="Circle of forces">Circle of forces</a></li> <li><a href="/wiki/Cold_inflation_pressure" title="Cold inflation pressure">Cold inflation pressure</a></li> <li><a href="/wiki/Contact_patch" title="Contact patch">Contact patch</a></li> <li><a href="/wiki/Cornering_force" title="Cornering force">Cornering force</a></li> <li><a href="/wiki/Ground_pressure" title="Ground pressure">Ground pressure</a></li> <li><a href="/wiki/Pacejka#The_Pacejka_.22Magic_Formula.22_tire_models" class="mw-redirect" title="Pacejka">Pacejka's Magic Formula</a></li> <li><a href="/wiki/Pneumatic_trail" title="Pneumatic trail">Pneumatic trail</a></li> <li><a href="/wiki/Relaxation_length" title="Relaxation length">Relaxation length</a></li> <li><a href="/wiki/Rolling_resistance" title="Rolling resistance">Rolling resistance</a></li> <li><a href="/wiki/Self_aligning_torque" title="Self aligning torque">Self aligning torque</a></li> <li><a href="/wiki/Slip_angle" title="Slip angle">Slip angle</a></li> <li><a href="/wiki/Steering_ratio#Alternate_definition" title="Steering ratio">Steering ratio</a></li> <li><a href="/wiki/Tire_balance" title="Tire balance">Tire balance</a></li> <li><a href="/wiki/Tire_load_sensitivity" title="Tire load sensitivity">Tire load sensitivity</a></li> <li><a href="/wiki/Tire_uniformity" title="Tire uniformity">Tire uniformity</a></li> <li><a href="/wiki/Lateral_Force_Variation" class="mw-redirect" title="Lateral Force Variation">Lateral Force Variation</a></li> <li><a href="/wiki/Radial_Force_Variation" class="mw-redirect" title="Radial Force Variation">Radial Force Variation</a></li> <li><a href="/wiki/Traction_(engineering)" class="mw-redirect" title="Traction (engineering)">Traction (engineering)</a></li> <li><a href="/wiki/Treadwear_rating" class="mw-redirect" title="Treadwear rating">Treadwear rating</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Behaviors" title="Outline of tires">Behaviors</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aquaplaning" title="Aquaplaning">Aquaplaning</a></li> <li><a href="/wiki/Groove_wander" title="Groove wander">Groove wander</a></li> <li><a href="/wiki/Slip_(vehicle_dynamics)" title="Slip (vehicle dynamics)">Slip (vehicle dynamics)</a></li> <li><a href="/wiki/Tramlining" title="Tramlining">Tramlining</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Maintenance" title="Outline of tires">Maintenance</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Tire_maintenance" title="Tire maintenance">Tire maintenance</a></li> <li><a href="/wiki/Tire_rotation" title="Tire rotation">Tire rotation</a></li> <li><a href="/wiki/Bicycle_pump" title="Bicycle pump">Bicycle pump</a></li> <li><a href="/wiki/Central_Tire_Inflation_System" class="mw-redirect" title="Central Tire Inflation System">Central Tire Inflation System</a></li> <li><a href="/wiki/Tire_mousse" title="Tire mousse">Tire mousse</a></li> <li><a href="/wiki/Tire-pressure_monitoring_system" title="Tire-pressure monitoring system">Tire-pressure monitoring system</a></li> <li><a href="/wiki/Tire-pressure_gauge" title="Tire-pressure gauge">Tire-pressure gauge</a></li> <li><a href="/wiki/Direct_TPMS" title="Direct TPMS">Direct TPMS</a></li> <li><a href="/wiki/Bead_breaker" title="Bead breaker">Bead breaker</a></li> <li><a href="/wiki/Tire_changer" title="Tire changer">Tire changer</a></li> <li><a href="/wiki/Tire_iron" title="Tire iron">Tire iron</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Life_cycle" title="Outline of tires">Life cycle</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Tire_manufacturing" title="Tire manufacturing">Tire manufacturing</a></li> <li><a href="/wiki/List_of_tire_companies" title="List of tire companies">List of tire companies</a></li> <li><a href="/wiki/Retread" title="Retread">Retread</a></li> <li><a href="/wiki/Waste_tires" class="mw-redirect" title="Waste tires">Waste tires</a></li> <li><a href="/wiki/Tire_recycling" title="Tire recycling">Tire recycling</a></li> <li><a href="/wiki/Tire_fire" title="Tire fire">Tire fire</a></li> <li><a href="/wiki/Blowout_(tire)" title="Blowout (tire)">Blowout</a></li> <li><a href="/wiki/Flat_tire" title="Flat tire">Flat tire</a></li> <li><a href="/wiki/Ozone_cracking" title="Ozone cracking">Ozone cracking</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Organizations" title="Outline of tires">Organizations</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/European_Tyre_and_Rim_Technical_Organisation" title="European Tyre and Rim Technical Organisation">European Tyre and Rim Technical Organisation</a></li> <li><a href="/wiki/Tire_Society" title="Tire Society">Tire Society</a></li> <li><a href="/wiki/Tire_Science_and_Technology" title="Tire Science and Technology">Tire Science and Technology</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_tires#Identification" title="Outline of tires">Identification</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Tire code</a></li> <li><a href="/wiki/Plus_sizing" title="Plus sizing">Plus sizing</a></li> <li><a href="/wiki/Tire_label" class="mw-redirect" title="Tire label">Tire label</a></li> <li><a href="/wiki/UTQG" class="mw-redirect" title="UTQG">Uniform Tire Quality Grading (UTQG)</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow hlist" colspan="2" style="font-weight:bold;"><div> <ul><li><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Symbol_portal_class.svg" class="mw-file-description" title="Portal"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/16px-Symbol_portal_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/23px-Symbol_portal_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/31px-Symbol_portal_class.svg.png 2x" data-file-width="180" data-file-height="185" /></a></span> <a href="/wiki/Outline_of_tires" title="Outline of tires">Outline of tires</a></li> <li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Tires" title="Category:Tires">Category</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Powertrain" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Powertrain" title="Template:Powertrain"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Powertrain" title="Template talk:Powertrain"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Powertrain" title="Special:EditPage/Template:Powertrain"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Powertrain" style="font-size:114%;margin:0 4em"><a 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