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Just reinforcing what Xmetal posted about going up in tire sizes. 235 fronts should have 265 rears. 245 fronts should have 275 rears.
Unfortunately for 19's on the rear there isn't a way to not mess with rolling diameter compared to stock. But keep in mind BMW also over-reports your speed from the factory. On stock wheels an indicated 80mph is actually 77. Almost all OEMs do this because the EU has legislation against under-reporting speed.
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'08 Z4M Coupe | Space Grey/Imola Red Extended/Carbon Leather | Eventuri Intake | Strömung Exhaust | Strong Strut Front/Rear Braces | 19" E46 M3 ZCP Wheels
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