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17 rim tyres
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<blockquote data-quote="absidian" data-source="post: 249970" data-attributes="member: 4356"><p>As they say, "do the maths" and you'll know the answer. </p><p></p><p>215/45/17 diameter 625mm circumference 1964mm</p><p>215/50/17 647mm 2032mm</p><p>Difference: diameter 21.5mm, circumference 67.5mm</p><p>About 3.44% difference.</p><p></p><p>So, your speedo will read 70mph (112.7kmph) when you're travelling 72.4mph (116.5kmph).</p><p></p><p></p><p>Incidentally, the 328s and M3s take 225/45/17 which is a closer match (1.44% difference) and is also a more common size to find/buy.</p><p></p><p></p><p>Hope this was useful. Enjoy making your conclusion <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>---</p></blockquote><p></p>
[QUOTE="absidian, post: 249970, member: 4356"] As they say, "do the maths" and you'll know the answer. 215/45/17 diameter 625mm circumference 1964mm 215/50/17 647mm 2032mm Difference: diameter 21.5mm, circumference 67.5mm About 3.44% difference. So, your speedo will read 70mph (112.7kmph) when you're travelling 72.4mph (116.5kmph). Incidentally, the 328s and M3s take 225/45/17 which is a closer match (1.44% difference) and is also a more common size to find/buy. Hope this was useful. Enjoy making your conclusion :) --- [/QUOTE]
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