{"id":123751,"date":"2024-12-07T07:54:48","date_gmt":"2024-12-07T15:54:48","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=123751"},"modified":"2025-02-26T09:29:56","modified_gmt":"2025-02-26T17:29:56","slug":"tire-measurements-explained","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/tire-measurements-explained\/","title":{"rendered":"Tire Measurements Explained"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column123751_e04a39-50 > .kt-inside-inner-col,.kadence-column123751_e04a39-50 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column123751_e04a39-50 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column123751_e04a39-50 > .kt-inside-inner-col{flex-direction:column;}.kadence-column123751_e04a39-50 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column123751_e04a39-50 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column123751_e04a39-50{position:relative;}@media all and (max-width: 1024px){.kadence-column123751_e04a39-50 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column123751_e04a39-50 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column123751_e04a39-50 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-da344b  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-828e87\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e, .wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e[data-kb-block=\"kb-adv-heading123751_0bb356-3e\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e[data-kb-block=\"kb-adv-heading123751_0bb356-3e\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading123751_0bb356-3e[data-kb-block=\"kb-adv-heading123751_0bb356-3e\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading123751_0bb356-3e summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading123751_0bb356-3e\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You&rsquo;ll come across a group of letters and numbers etched on the sidewall of your tires. These figures represent a specific feature on your tires.<\/li>\n\n\n\n<li>Tire type, width, aspect ratio, and speed rating are some of the specifications you&rsquo;ll spot on the sidewall.<\/li>\n\n\n\n<li>There are two ways you can measure tire height. You can either compute it manually or simply use a calculator.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/simpletire\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Tires\">Tires<\/a> are one of the many parts of your vehicle that require frequent replacements, mainly because they&rsquo;re always coming into contact with the ground.<\/p>\n\n\n\n<p>And if you&rsquo;re relatively new to driving or owning a vehicle, one of the first things you should familiarize yourself with is the size of your tires.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Tire Sizes Work<\/h2>\n\n\n\n<p>You&rsquo;ll come across a group of letters and numbers etched on the sidewall of your tires. These figures represent a specific feature on your tires.<\/p>\n\n\n\n<p>For easier representation, let&rsquo;s use this tire size&#19968;P 215 \/ 65 R 15 89 H.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tire Type<\/h3>\n\n\n\n<p>The letter &ldquo;P&rdquo; in our example represents the tire type, which stands for &ldquo;passenger vehicle tire.&rdquo; Vehicles that fall under this classification include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cars<\/li>\n\n\n\n<li>SUVs<\/li>\n\n\n\n<li>Crossovers<\/li>\n\n\n\n<li>Electric vehicles<\/li>\n\n\n\n<li>Small pickup trucks<\/li>\n<\/ul>\n\n\n\n<p>Other than the passenger vehicle tire classification, tires can also be classified as LT or &ldquo;light truck tire,&rdquo; as well as ST or &ldquo;special trailer.&rdquo;<\/p>\n\n\n\n<p>LT tires are intended for vehicles that can carry heavy loads, mainly three-quarter or one-ton trucks and SUVs.<\/p>\n\n\n\n\n\n\n<p>Lastly, ST tires are for travel, boat, and utility trailers.<\/p>\n\n\n\n<p><strong>Note:<\/strong> If there&rsquo;s no letter before the tire width, you probably have a metric tire or <a href=\"https:\/\/www.carparts.com\/blog\/euro-metric-and-p-metric-tire-sizes-explained\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"European-sized tire\">European-sized tire<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tire Width<\/h3>\n\n\n\n<p>Going back to our example, the three-digit number following the tire type represents the tire width.<\/p>\n\n\n\n<p>Also referred to as the section width, this figure represents the tire&rsquo;s side-to-side measurement in millimeters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Aspect Ratio<\/h3>\n\n\n\n<p>The aspect ratio follows the tire width. To avoid confusion, a forward slash separates the two figures.<\/p>\n\n\n\n<p>Aspect ratio refers to the height of the sidewall measured from the rim of the wheel to the top of the tread. Aspect ratio is often expressed as a percentage of tire width.<\/p>\n\n\n\n<p>But if you want to get the tire&rsquo;s sidewall height in inches, you&rsquo;ll need to perform a couple of mathematical functions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, convert the tire width from millimeters to inches.<\/li>\n\n\n\n<li>Next, multiply the figure by 65% or 0.65.<\/li>\n\n\n\n<li>The figure derived from this equation will represent the sidewall height in inches.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"810\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info-1024x810.jpg\" alt=\"diagram showing info of a tire sidewall\" class=\"wp-image-130951\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info-1024x810.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info-300x237.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info-768x608.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info-150x119.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-sidewall-info.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Diagram showing aspect ratio and other information on a tire&rsquo;s sidewall | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Construction Type<\/h3>\n\n\n\n<p>In our example, &ldquo;R&rdquo; stands for &ldquo;radial tires,&rdquo; which is the industry standard for everyday tires. Radial tires generally have a blend of polyester, steel, and fabric in their plies, which are then coated with rubber.<\/p>\n\n\n\n<p>Radial tires are known for their exceptional road grip, low rolling resistance, ride comfort, and durability.<\/p>\n\n\n\n<p>Tires can also be marked with the letter &ldquo;D&rdquo; after the aspect ratio, which stands for diagonal plies.<\/p>\n\n\n\n<p>Diagonal plies or bias-constructed tires have criss-crossed plies usually found in motorcycle and trailer tires.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Wheel Diameter<\/h3>\n\n\n\n<p>Wheel diameter refers to the distance between the two bead seat areas measured in inches.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Load Index<\/h3>\n\n\n\n<p>The last number you&rsquo;ll see on your tire represents the <a href=\"https:\/\/www.carparts.com\/blog\/tire-speed-rating-and-tire-load-index-charts\/#Tire_Load_Index_Chart\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"load index\">load index<\/a> or the heaviest weight the tire can support when it&rsquo;s inflated to the maximum air pressure rating.<\/p>\n\n\n\n<p>The tire load index has a corresponding weight capacity expressed in pounds (lbs.).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Speed Rating<\/h3>\n\n\n\n<p>A letter from the alphabet would be the last thing you&rsquo;ll see on your tire, which represents the tire&rsquo;s speed rating.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blog\/tire-speed-rating-and-tire-load-index-charts\/#Tire_Speed_Rating_Chart\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"speed rating\">speed rating<\/a> indicates the safest top speed the tire can travel for a sustained amount of time. A higher speed rating also means that the tire is better equipped for managing heat and provides better control when travelling at high speeds.<\/p>\n\n\n\n<p>In our example, the speed rating is &ldquo;H.&rdquo; This rating means that the tire can sustain its performance if the vehicle is traveling at 130 mph.<\/p>\n\n\n\n<p>Tires that are designed for speeds above 149 mph have a &ldquo;ZR&rdquo; designation, as well as a letter &ldquo;Y&rdquo; enclosed in brackets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Measure Total Tire Height<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"653\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-1024x653.jpg\" alt=\"tire size measurement explained\" class=\"wp-image-123778\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-1024x653.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-300x191.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-768x490.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-1536x980.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained-150x96.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/12\/tire-size-measurement-explained.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">When measuring tire height, you need to multiply the tire&rsquo;s sidewall height by two and add the rim size.<\/figcaption><\/figure>\n\n\n\n<p>There are two ways you can measure tire height. You can either compute it manually or simply use a calculator.<\/p>\n\n\n\n<p>When measuring tire height, you need to multiply the tire&rsquo;s sidewall height by two and add the rim size. Note that the equation to compute the tire&rsquo;s sidewall is already mentioned in this article.<\/p>\n\n\n\n<p>But if math isn&rsquo;t your thing and you want to take the easier route, you can hit up the search bar and look for a tire height calculator.<\/p>\n\n\n\n<p>Most tire height calculators will only require you to input details like the tire width, aspect ratio (in percentage), and wheel size.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Change Your Vehicle&rsquo;s Recommended Tire Size?<\/h2>\n\n\n\n<p>While it&rsquo;s possible to replace your vehicle&rsquo;s tire size with a modified one, it&rsquo;s important to remember that a lot of factors will come into play when you do.<\/p>\n\n\n\n<p>Switching to a bigger tire size significantly reduces the gap between the tire and fender, increases your vehicle&rsquo;s ground clearance, and helps improve overall ride comfort.<\/p>\n\n\n\n<p>On the downside, expect to lose some torque when you switch to a bigger tire size. Your brakes&rsquo; stopping power could also be affected negatively due to the bigger size.<\/p>\n\n\n\n<p>If you&rsquo;re planning to get a different tire size for your vehicle, make sure you&rsquo;ve done enough research and consult professionals on how to go about the modification to avoid any complications down the road.<\/p>\n\n\n\n<p>Getting the wrong tire specifications can damage your vehicle&rsquo;s suspension, wheels, and other parts.<\/p>\n\n\n\n<p>Tire width is another factor to consider when replacing your stock tires. Going for wider tires can have a lot of advantages, including increased lateral grip, better braking performance, decreased body roll, and improved aesthetic appeal.<\/p>\n\n\n\n<p>However, wider tires also have their fair share of disadvantages, including increased fuel consumption, reduced turning radius, and increased road noise.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<p>You can never go wrong with familiarizing yourself with your tire&rsquo;s specifications. Doing so ensures that you buy the right set of replacements every time, helping you save time and money.<\/p>\n\n\n\n<p>Like other vehicle upgrades, stock tires can be switched with different specifications for performance and aesthetic reasons.<\/p>\n\n\n\n<p>But before you install a different set of tires in terms of size, make sure you&rsquo;ve done enough research. Changing tire size can have a significant impact on your vehicle&rsquo;s suspension and overall performance, so make sure you&rsquo;re on the right track by consulting professionals.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get Wheels and Tires for Your Vehicle Today<\/h2>\n\n\n\n<p>Whether you&rsquo;re changing your tire size or simply getting replacement tires, you should always make sure you&rsquo;re getting the right tires for your vehicle. Getting the wrong tires isn&rsquo;t only an expensive mistake but a dangerous one too. Driving with the wrong tire size can affect your vehicle&rsquo;s braking distance, cornering stability, and steering responsiveness. It can also cause damage to your struts and shocks, leading to premature wear. For your own sake, make sure to double-check the tires you&rsquo;re getting. Luckily, getting the right tire size is fast and easy with CarParts.com.<\/p>\n\n\n\n<p><a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a> offers a wide selection of wheel and tire packages of varying sizes for different types of vehicles. To avoid getting the wrong tires, don&rsquo;t forget to use our built-in vehicle selector. Just input your vehicle&rsquo;s year, make, and model, and you&rsquo;ll see all the different tires that are compatible with your ride. The best part is that you don&rsquo;t have to wait too long for your new set of tires to arrive. If you order by 12 p.m. ET, you can expect your package to arrive in as fast as two business days!<\/p>\n\n\n\n<p>Don&rsquo;t take any chances when buying a new set of tires. Check out our catalog of high-quality <a href=\"https:\/\/www.carparts.com\/wheel-and-tire-package\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel and tire packages\">wheel and tire packages<\/a> at CarParts.com and order the right one for your vehicle today!<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Tires are one of the many parts of your vehicle that require frequent replacements, mainly because they&rsquo;re always coming into&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/tire-measurements-explained\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":123752,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3752],"tags":[3799],"ppma_author":[2607,2985],"class_list":{"0":"post-123751","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-wheels-and-tires","9":"tag-wheel-and-tire-package","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tire Measurements Explained - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Wondering how tire sizes work? 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He has produced a coffee table book of digital watercolors called \u201cMemories of South Alabama\u201d created from his personal photos, along with a dozen Christian fiction short original novels and a collection of short stories, all available in Kindle or softcover format. 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He has won two International Automotive Media Awards for technical articles published in trade magazines.<\/p><\/li>\r\n<li><p>Has attended hundreds of hours of automotive training from OEMs including GM, Volkswagen, Mazda, Renault, Jeep, Chrysler, as well as additional training at events like KC Vision and MACS (Mobile Air Climate Systems Association).<\/p><\/li>\r\n<li><p>Taught college level auto mechanics for 19 years.<\/p><\/li>\r\n<li><p>Has written for automotive training companies (including course development work for training companies in Canada and the Netherlands) and has been hired to teach professional trade show technician courses at multiple training events in Texas and Alabama.<\/p><\/li>\r\n<li><p>While still teaching at the college level, Richard launched a new automotive program in Geneva, Alabama, setting up a dual enrollment department in a new building, organizing the shop and classroom, teaching morning classes to high school students for 2 years while still teaching at the college in the afternoon.<\/p><\/li>\r\n<li><p>Richard\u2019s college program at Lurleen B. Wallace Community College worked at professional shop speed during his tenure to prepare graduates for production level work in the real world.<\/p><\/li>\r\n<\/ul>"}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/123751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=123751"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/123751\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/123752"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=123751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=123751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=123751"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=123751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}