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      06-06-2008, 01:01 PM   #5
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2008 E92 M3  [0.00]
From experience I would not go wider than recommended for the rim. As everyone has said the handling will be affected but what they haven't said is that your tramlining and steering input will also increase, your car will wonder more so over the road and will require more steering input to arrow straight which is a bigger problem as your speed increases.

I remember a customer's car (328ci) with factory fit 17" that was running 225 at the front, in the end the dealer decided to swap these for 205 or 215 at the front and the difference was remarkable.

You should never over tyre a rim.