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Message: <blockquote data-quote="bimmerman" data-source="post: 37569" data-attributes="member: 126"><p>Must agree with Kevster. 205/55/15 will preserve your speedometer accuracy as well. Try using this handy calculator. <a href="http://www.miata.net/garage/tirecalc.html" target="_blank">http://www.miata.net/garage/tirecalc.html</a>Your 3 series is not the most grippy of cars but it sure is one heckova fun car to chuck around corners. 205/55/15 will not only give you comfort but will also allow you to go sideways with lotsa early warning and feel before traction is totally lost. A lower tire profile will give you more grip but will also tend to break away suddenly at the limit without due warning and give you a nasty surprise. Not so much fun in such a fun car in my opinion and does not suit the cars character.</p></blockquote><p></p>