{"id":5809,"date":"2020-02-28T09:00:46","date_gmt":"2020-02-28T08:00:46","guid":{"rendered":"https:\/\/www.presticebdt.com\/?p=5809"},"modified":"2020-11-06T10:05:51","modified_gmt":"2020-11-06T09:05:51","slug":"tire-code-explained-find-the-size-tire","status":"publish","type":"post","link":"https:\/\/www.presticebdt.com\/el\/tire-code-explained-find-the-size-tire\/","title":{"rendered":"\u0397 \u03ad\u03bd\u03bd\u03bf\u03b9\u03b1 \u03c4\u03bf\u03c5 \u03ba\u03c9\u03b4\u03b9\u03ba\u03bf\u03cd \u03b5\u03bb\u03b1\u03c3\u03c4\u03b9\u03ba\u03ce\u03bd \u03b5\u03be\u03b7\u03b3\u03b5\u03af\u03c4\u03b1\u03b9 | Motorsport World"},"content":{"rendered":"<section  class='av_textblock_section av-k4odsn2t-022461ea4f00186a837ce1192d07fe83'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h1 style=\"text-align: center;\"><strong>Tire code explained: check the size of your tires <\/strong><\/h1>\n<h2>The meaning of tire code explained.<\/h2>\n<p>We&#8217;ve already written a number of articles related to tyre behaviour and their performances (<a href=\"https:\/\/www.presticebdt.com\/el\/modeling-tyre-magic-formula-and-brush-model\/\">see here<\/a>). This time we want to focus on a more real problem: the tire code. How many times have you tried to understand the meaning of the tire code visibile on the side? In this article, we&#8217;ll get a chance to explain the fundamental meaning of the tire code.<\/p>\n<h5><strong>Physical characteristics and dimensions in a tire. The basic characteristics of a tire, usually written with hot-stamped code markings on the side of the tire, are:<br \/>\n<\/strong><\/h5>\n<ul>\n<li>Performance characteristics<\/li>\n<li>Construction features<\/li>\n<li>Date of production<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-5810 size-medium\" src=\"https:\/\/www.presticebdt.com\/wp-content\/uploads\/2020\/02\/1-10-300x241.png\" alt=\"Tire code explained\" width=\"300\" height=\"241\" title=\"\" srcset=\"https:\/\/b3469057.smushcdn.com\/3469057\/wp-content\/uploads\/2020\/02\/1-10-300x241.png?lossy=2&amp;strip=1&amp;webp=1 300w, https:\/\/b3469057.smushcdn.com\/3469057\/wp-content\/uploads\/2020\/02\/1-10-495x400.png?lossy=2&amp;strip=1&amp;webp=1 495w, https:\/\/b3469057.smushcdn.com\/3469057\/wp-content\/uploads\/2020\/02\/1-10-705x566.png?lossy=2&amp;strip=1&amp;webp=1 705w, https:\/\/b3469057.smushcdn.com\/3469057\/wp-content\/uploads\/2020\/02\/1-10.png?lossy=2&amp;strip=1&amp;webp=1 750w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>We indicate:<\/p>\n<ul>\n<li><strong>T<\/strong>: Tire type (P = passenger, that is, for cars) not mandatory in Europe<\/li>\n<li><strong>l<\/strong>: Maximum tire width, under pressure and load conditions defined by the standards, this measurement is expressed in millimeters, in rare cases in inches and in the past it was also expressed with a literal system, in some cases it is possible to switch between a system other<\/li>\n<li><strong>h<sub>l<\/sub><\/strong>: Ratio, expressed as a percentage, between shoulder height and section width (therefore multiplying l by h gives the height of the shoulder). The tire is defined as low when this ratio is less than 80, super-low when it is less than 45. The smaller this number, the better the grip at the expense of comfort. If omitted, it is to be considered 80.<\/li>\n<li><strong>S<sub>t<\/sub><\/strong>: Structure concerning the arrangement of the plies and indicated with a letter, it can be radial &#8220;R&#8221; (&#8220;ZR&#8221; if the tire exceeds 240 km \/ h) or diagonal (also called bias belted or conventional or crossed plies) &#8221; B &#8220;or&#8221; &#8211; &#8220;<\/li>\n<li><strong>d<\/strong>: Rim diameter (usually in inches, more rarely in millimeters)<\/li>\n<li><strong>c<sub>M<\/sub><\/strong>: maximum permissible load. It is a reference index to the limit mass (in kg) allowed on the single wheel. By law, tires with a capacity equal to or greater than the values \u200b\u200btranscribed in the registration certificate must be fitted. The actual values \u200b\u200breferred to the indices are:<\/li>\n<li>0 = 45 <em>kg<\/em><\/li>\n<li>10 = 60 <em>kg<\/em><\/li>\n<li>28 = 100 <em>kg<\/em><\/li>\n<li>42 = 150 <em>kg<\/em><\/li>\n<li>52 = 200 <em>kg<\/em><\/li>\n<li>66 = 300 <em>kg<\/em><\/li>\n<li>76 = 400 <em>kg<\/em><\/li>\n<li>84 = 500 <em>kg<\/em><\/li>\n<li>90 = 600 <em>kg<\/em><\/li>\n<li>96 = 710 <em>kg<\/em><\/li>\n<li>100 = 800 <em>kg<\/em><\/li>\n<li>108 = 1000 <em>kg<\/em><\/li>\n<li>122 = 1500 <em>kg<\/em><\/li>\n<li>132 = 2000 <em>kg<\/em><\/li>\n<li>146 = 3000 <em>kg<\/em><\/li>\n<li>164 = 5000 <em>kg<\/em><\/li>\n<li>188 = 10000 <em>kg<\/em><\/li>\n<li>212 = 20000 <em>kg<\/em><\/li>\n<li>268 = 100000 <em>kg<\/em><\/li>\n<li>279 = 136000 <em>kg<\/em><\/li>\n<li><strong>v<sub>M<\/sub><\/strong>: Maximum permissible speed expressed by a letter, by law tires must be fitted with a capacity equal to or greater than the values \u200b\u200btranscribed in the registration certificate, more precisely:<\/li>\n<li><strong>A1<\/strong>: 5 <em>km\/h<\/em><\/li>\n<li><strong>A8<\/strong>: 40 <em>km\/h<\/em><\/li>\n<li><strong>B<\/strong>: 50 <em>km\/h<\/em><\/li>\n<li><strong>J<\/strong>: 100 <em>km\/h<\/em><\/li>\n<li><strong>P<\/strong>: 150 <em>km\/h<\/em><\/li>\n<li><strong>U<\/strong>: 200 <em>km\/h<\/em><\/li>\n<li><strong>Y<\/strong>: 300 <em>km\/h<\/em><\/li>\n<\/ul>\n<p>There are also some <strong>particular indices<\/strong>, which do not only indicate the speed or indicate it in a different way<\/p>\n<ul>\n<li>VR: over 210 km \/ h (maximum is not specified)<\/li>\n<li>ZR: over 240 km \/ h (maximum is not specified)<\/li>\n<li>ZR + W: over 240 km \/ h (maximum speed less than 270 km \/ h)<\/li>\n<li>ZR + Y: over 240 km \/ h (maximum speed less than 300 km \/ h)<\/li>\n<li>ZR + load index + W: over 240 km \/ h (top speed above 300 km \/ h)<\/li>\n<\/ul>\n<p>(all tires exceeding 240 km \/ h must have the letter Z indicated in the indication of the dimensional designation of the tire eg: 255\/30 ZR 19 94W)<\/p>\n<ul>\n<li><strong>S<sub>ca<\/sub><\/strong>: Attitude to use without inner tube, with the wording &#8220;TL&#8221; or &#8220;Tubeless&#8221;<\/li>\n<li><strong>D<\/strong>: expressed as xxyy, where xx is the week and yy the year of construction.<\/li>\n<li><strong>N<\/strong>: Name of the tire, in the form of a registered trademark.<\/li>\n<li><strong>M + S<\/strong>: commonly defined winter tires (Mud and Snow)<\/li>\n<\/ul>\n<p><strong>XL<\/strong>: heavier load (usually stiffer shoulder)<\/p>\n<p>An <strong>example<\/strong> of a real membership could be:<\/p>\n<p><strong>P235 \/ 45R17 97W<\/strong><\/p>\n<p>interpretable as:<\/p>\n<ul>\n<li>P indicates that it is a passenger car tire (&#8220;P&#8221; of passenger).<\/li>\n<li>235 &#8211; the width is 235 mm.<\/li>\n<li>45 &#8211; the ratio of height to width is 45% &#8211; consequently the height is 105.75 mm.<\/li>\n<li>R &#8211; this is a radial tire.<\/li>\n<li>17 &#8211; for 17-inch wheels.<\/li>\n<li>97 &#8211; the maximum permissible weight, in this case of 730 kg.<\/li>\n<li>W &#8211; for a maximum speed of 270 km\/h (167 mph).<\/li>\n<\/ul>\n<p>The production date is identified by three digits of which the first two indicate the week and the last one thousandth of the year of manufacture, sometimes a four-digit code is used where the last two indicate the year of production, example 4792 (week 47, year 1992) or 4709 (week 47, year 2009)<\/p>\n<p><strong>Approval codes<\/strong><\/p>\n<p>Depending on the country or continent, the tire must follow certain <strong>homologation<\/strong> laws and bear the wording of the same on the tire, generally given that tire manufacturers work internationally, multiple approvals can be reported on the same tire.<\/p>\n<p>The main terms are:<\/p>\n<h4><img decoding=\"async\" class=\"aligncenter wp-image-5811 size-full\" src=\"https:\/\/www.presticebdt.com\/wp-content\/uploads\/2020\/02\/Immagine1.jpg\" alt=\"how to find size in a tire code\" width=\"293\" height=\"150\" title=\"\"><\/h4>\n<h3>What is a DOT of a tire?<\/h3>\n<h4>DOT of a tire explained.<\/h4>\n<ul>\n<li>DOT (Department of Transportation) American approval with attached tire production date, 4-digit date, the first two indicate the week and the other two refer to the year of production<\/li>\n<li>ECE-UN \/ EU and Directive 92\/23 \/ EEC are the European approvals<\/li>\n<li>E1 indicates the approval and the country that issued it, approval is a mandatory requirement.<\/li>\n<\/ul>\n<p>These approvals also provide for the use of additional abbreviations to identify the characteristics of use of the tire or particular characteristics \/ treatments, such as:<\/p>\n<ul>\n<li>MST (Multi Service Tire) indicates p special tires suitable for mixed road and off-road use.<\/li>\n<li>NHS (Not for Highway Service) indicates tires not for road use, as for competition use only.<\/li>\n<li>P (passenger car) indicates a tire for exclusive use for cars, this abbreviation is placed before the tire size<\/li>\n<li>RETREAD or 108 R wording for retreaded tires, where the original (European) type-approval mark is canceled, and replaced by a mark that refers to the UN-ECE Regulation no. 108<\/li>\n<li>Snowflake symbol represents a mountain with a snowflake inside, this symbol identifies winter tires approved according to American standards.<\/li>\n<\/ul>\n<h3><strong>Tire label explained. How to find consumption, wet grip and rolling noise of a tire.<br \/>\n<\/strong><\/h3>\n<p><img decoding=\"async\" class=\"size-full wp-image-5812 aligncenter\" src=\"https:\/\/www.presticebdt.com\/wp-content\/uploads\/2020\/02\/Immagine2.jpg\" alt=\"Tire label\" width=\"132\" height=\"192\" title=\"\"><\/p>\n<p>The measured, evaluated and shown parameters are:<\/p>\n<ul>\n<li><strong>Consumption<\/strong> (rolling resistance), where the rolling resistance is assessed, as the greater the rolling resistance and the higher the fuel consumption, which changes not only because of the physical characteristics of the tire, but also with the <strong>\u03c0\u03af\u03b5\u03c3\u03b7<\/strong> of the same.<\/li>\n<\/ul>\n<ul>\n<li><strong>Wet grip<\/strong>, this evaluation is carried out by braking a car on a wet surface Test performed by a standard vehicle equipped with ABS, which must go from 80 to 20 km\/h, water layer between 0.5 and 1.5 mm, with a temperature between 2 and 20\u00b0C for winter tires and between 5 and 35\u00b0C for summer tires.<\/li>\n<li><strong>External rolling noise<\/strong>, represents the noise produced by the tire while driving outside the vehicle and displays the value in dB and through a loudspeaker with lots of sound bars, which represent:\n<ul>\n<li>3 black bars = tire compliant with current regulations<\/li>\n<li>2 black bars = average noisy tire, between the future limit and 3 dB below<\/li>\n<li>1 black bar = low noise tire, over 3 dB below the future limit.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div><\/section>\n<div  class='av_promobox av-kh614co7-5d88543892e18728edb5b5d9331ff249 avia-button-yes  avia-builder-el-1  el_after_av_textblock  avia-builder-el-last'><div class='avia-promocontent'><p>\nFor all the articles about tires, please check here!<\/p>\n<\/div><div  class='avia-button-wrap av-kh614co7-702884592a58515470c1bf57d035e990-wrap avia-button-right'><a href='https:\/\/www.presticebdt.com\/el\/tag\/tyre-behaviour\/'  class='avia-button av-kh614co7-702884592a58515470c1bf57d035e990 av-link-btn avia-icon_select-no avia-size-large avia-position-right avia-color-theme-color'  ><span class='avia_iconbox_title' >Read!<\/span><\/a><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>\u0397 \u03ad\u03bd\u03bd\u03bf\u03b9\u03b1 \u03c4\u03bf\u03c5 \u03ba\u03c9\u03b4\u03b9\u03ba\u03bf\u03cd \u03b5\u03bb\u03b1\u03c3\u03c4\u03b9\u03ba\u03ce\u03bd \u03b5\u03be\u03b7\u03b3\u03b5\u03af\u03c4\u03b1\u03b9. \u03a0\u03ce\u03c2 \u03bd\u03b1 \u03b5\u03bb\u03ad\u03b3\u03be\u03b5\u03c4\u03b5 \u03c4\u03bf \u03bc\u03ad\u03b3\u03b5\u03b8\u03bf\u03c2 \u03c4\u03c9\u03bd \u03b5\u03bb\u03b1\u03c3\u03c4\u03b9\u03ba\u03ce\u03bd \u03c3\u03b1\u03c2; \u0395\u03c4\u03b9\u03ba\u03ad\u03c4\u03b1 \u03b5\u03bb\u03b1\u03c3\u03c4\u03b9\u03ba\u03ce\u03bd \u03ba\u03b1\u03b9 \u03c0\u03c1\u03bf\u03b4\u03b9\u03b1\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2 DOT.<\/p>","protected":false},"author":4,"featured_media":5813,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[39,94,36,130],"_links":{"self":[{"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/posts\/5809"}],"collection":[{"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/comments?post=5809"}],"version-history":[{"count":0,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/posts\/5809\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/media\/5813"}],"wp:attachment":[{"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/media?parent=5809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/categories?post=5809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.presticebdt.com\/el\/wp-json\/wp\/v2\/tags?post=5809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}