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I would stick to the OEM sizes so you keep the same rolling diameter and don't throw off the speedometer.
For tire, the Michelin PS4S will be a great all-rounder. Continental Extreme Contacts would be another tire to consider, but the Michelins tend to be quieter.
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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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