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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"><p>The <b>European Tyre and Rim Technical Organisation</b> (ETRTO) exists to specify and harmonise sizes of rims and their associated <a href="/wiki/Pneumatic_tyre" class="mw-redirect" title="Pneumatic tyre">pneumatic tyres</a> across the <a href="/wiki/European_Union" title="European Union">European Union</a>. ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user. </p><p>ETRTO works in liaison with the <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">International Organization for Standardization</a> to develop relevant standards.<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> </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=European_Tyre_and_Rim_Technical_Organisation&action=edit&section=1" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/ISO_5775" title="ISO 5775">ISO 5775</a> – standard bicycle tyre and rim designations</li> <li><a href="/wiki/Uniform_Tire_Quality_Grading" title="Uniform Tire Quality Grading">Uniform Tire Quality Grading</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=European_Tyre_and_Rim_Technical_Organisation&action=edit&section=2" 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"><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.iso.org/iso/about/organizations_in_liaison/organizations_in_liaison_details.htm?id=9056&LiaisonList=True">List of ISO committees in liaison with ETRTO</a></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 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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" 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<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 href="/wiki/Tire_code#Tractor_tires" title="Tire code">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 class="mw-selflink selflink">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 href="/wiki/Tire_code" title="Tire code">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 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