{"id":78,"date":"2020-07-13T23:23:49","date_gmt":"2020-07-13T14:23:49","guid":{"rendered":"https:\/\/everinterest.net\/en\/?p=78"},"modified":"2026-04-23T07:02:23","modified_gmt":"2026-04-22T22:02:23","slug":"f25-summer-tyre-primacy4-235-55r18","status":"publish","type":"post","link":"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/","title":{"rendered":"BMW F25 X3 Summer Tyres \u2013 Michelin Primacy 4 235\/55R18 Size-Up"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">These are the summer tyres I&#8217;ve been running on my BMW F25 X3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Michelin Primacy 4 235\/55R18 VOL<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.michelin.co.uk\/auto\/tyres\/michelin-primacy-4\" target=\"_blank\" rel=\"noopener\">Michelin Primacy 4 \u2013 Official Product Page (michelin.co.uk)<\/a><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/#Why_I_Changed_the_Size_from_OEM\" >Why I Changed the Size from OEM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/#Speedometer_Odometer_Correction\" >Speedometer &#038; Odometer Correction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/#Fitment_Real-World_Impressions\" >Fitment &#038; Real-World Impressions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/#Where_I_Had_Them_Fitted\" >Where I Had Them Fitted<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_I_Changed_the_Size_from_OEM\"><\/span>Why I Changed the Size from OEM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The stock tyre size on the F25 X3 is <strong>245\/50R18<\/strong>. I went up to <strong>235\/55R18<\/strong> hoping for a small bump in fuel economy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It took me a long time to settle on a tyre. I figure I&#8217;ll run a set for at least 50,000 km, so I was more careful than usual. Since I always carry a puncture repair kit and a portable inflator, I ruled out run-flat tyres and stuck to standard options for the stock 18-inch wheels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I compared several candidates on Kakaku.com and seriously considered the <strong>Le Mans V 245\/50R18 100W<\/strong> right up to the end. The Primacy 4 edged it out mainly because the price was slightly lower at the time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Speedometer_Odometer_Correction\"><\/span>Speedometer &#038; Odometer Correction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The outer diameter grows from 703 mm to 715 mm \u2014 a difference of about 1.7 %. That means the speedometer reads roughly 1.7 % slower than the actual speed. With the stock size, GPS confirmed the real speed was about 97 km\/h when the dash showed 100 km\/h. With the new size the indicated speed is still below actual, so there is no legal issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The contact patch is 10 mm narrower side-to-side, but the larger diameter increases the fore-aft contact length to compensate. Whether the net result actually improves fuel economy \u2014 I was genuinely curious to find out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fitment_Real-World_Impressions\"><\/span>Fitment &#038; Real-World Impressions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There were no examples online of anyone fitting this size on an F25 X3, which did make me a little nervous. In practice, there was absolutely no rubbing against the wheel arch, and the speedometer error matched my calculation almost perfectly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Being a Volvo-certified tyre, the Primacy 4 delivers on all three counts I care about: <strong>low road noise, confident grip, and reasonable fuel economy<\/strong>. The slight ride-height gain from the taller tyre is a pleasant bonus. The odometer also ticks up 1.7 % more slowly, which feels oddly satisfying at high mileage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_I_Had_Them_Fitted\"><\/span>Where I Had Them Fitted<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I ordered the tyres online and had them mounted at my local pit station. They do clean, careful work at very reasonable prices \u2014 highly recommended if you are in the area.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I plan to write up a proper comparison of fuel economy and other performance metrics once I have enough data from different tyre sets.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>These are the summer tyres I&#8217;ve been running on my BMW F25 X3. Michelin Primacy 4 235\/55R18 VOL Michelin Primacy 4 \u2013 Official Product Page (michelin.co.uk) Why I Changed the Size from OEM The stock tyre size on the F25 X3 is 245\/50R18. I went up to 235\/55R18 hoping for a small bump in fuel economy. It took me a long time to settle on a tyre. I figure I&#8217;ll run a set for at least 50,000 km, so I was more careful than usual. Since I always carry a puncture repair kit and a portable inflator, I ruled out run-flat tyres and stuck to standard options for the stock [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":83,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[8,3],"tags":[57,48,47,10,11,13,50,56,52,54,53,12],"class_list":["post-78","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bmw-x3-f25","category-cars-motorbikes","tag-18inch","tag-235-55r18","tag-245-50r18","tag-bmw","tag-f25","tag-fuel-economy","tag-michelin","tag-non-run-flat-tires","tag-primacy4","tag-summer-tires","tag-vol","tag-x3"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>BMW F25 X3 Summer Tyres \u2013 Michelin Primacy 4 235\/55R18 Size-Up - Maybe Useful Stuff \u2013 BMW DIY &amp; Cars<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BMW F25 X3 Summer Tyres \u2013 Michelin Primacy 4 235\/55R18 Size-Up - Maybe Useful Stuff \u2013 BMW DIY &amp; Cars\" \/>\n<meta property=\"og:description\" content=\"These are the summer tyres I&#8217;ve been running on my BMW F25 X3. Michelin Primacy 4 235\/55R18 VOL Michelin Primacy 4 \u2013 Official Product Page (michelin.co.uk) Why I Changed the Size from OEM The stock tyre size on the F25 X3 is 245\/50R18. I went up to 235\/55R18 hoping for a small bump in fuel economy. It took me a long time to settle on a tyre. I figure I&#8217;ll run a set for at least 50,000 km, so I was more careful than usual. Since I always carry a puncture repair kit and a portable inflator, I ruled out run-flat tyres and stuck to standard options for the stock [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/everinterest.net\/en\/f25-summer-tyre-primacy4-235-55r18\/\" \/>\n<meta property=\"og:site_name\" content=\"Maybe Useful Stuff \u2013 BMW DIY &amp; Cars\" \/>\n<meta property=\"article:published_time\" content=\"2020-07-13T14:23:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-22T22:02:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/everinterest.net\/en\/wp-content\/uploads\/2020\/07\/f25-summer-tires-ic-e1597754958255.png\" \/>\n\t<meta property=\"og:image:width\" content=\"450\" \/>\n\t<meta property=\"og:image:height\" content=\"405\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"t48m\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"t48m\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/f25-summer-tyre-primacy4-235-55r18\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/f25-summer-tyre-primacy4-235-55r18\\\/\"},\"author\":{\"name\":\"t48m\",\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/#\\\/schema\\\/person\\\/a66256bbebeed9fb8841f0738020bdfa\"},\"headline\":\"BMW F25 X3 Summer Tyres \u2013 Michelin Primacy 4 235\\\/55R18 Size-Up\",\"datePublished\":\"2020-07-13T14:23:49+00:00\",\"dateModified\":\"2026-04-22T22:02:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/f25-summer-tyre-primacy4-235-55r18\\\/\"},\"wordCount\":405,\"publisher\":{\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/#\\\/schema\\\/person\\\/a66256bbebeed9fb8841f0738020bdfa\"},\"image\":{\"@id\":\"https:\\\/\\\/everinterest.net\\\/en\\\/f25-summer-tyre-primacy4-235-55r18\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/everinterest.net\\\/en\\\/wp-content\\\/uploads\\\/2020\\\/07\\\/f25-summer-tires-ic-e1597754958255.png\",\"keywords\":[\"18 inch\",\"235\\\/55R18\",\"245\\\/50R18\",\"bmw\",\"F25\",\"fuel economy\",\"Michelin\",\"non-run-flat\",\"primacy4\",\"summer tyres\",\"vol\",\"X3\"],\"articleSection\":[\"BMW X3 (F25)\",\"Cars &amp; 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Michelin Primacy 4 235\/55R18 VOL Michelin Primacy 4 \u2013 Official Product Page (michelin.co.uk) Why I Changed the Size from OEM The stock tyre size on the F25 X3 is 245\/50R18. I went up to 235\/55R18 hoping for a small bump in fuel economy. It took me a long time to settle on a tyre. I figure I&#8217;ll run a set for at least 50,000 km, so I was more careful than usual. 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