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Old 04-09-2009, 11:42 PM   #2
e36_all_out
2nd Gear Member
 
Join Date: Aug 2007
Location: T.O
Posts: 148
Yes the runflats will cause that noise. Especially while under braking because there is so much more load on the front wheels while you are applying the brake. Its called cupping and because of the suspension setup on the e90's is causes a very uneven wear on inner and outer treds.

The ride that you experience to be rough is caused by the stiff side wall which makes them runflats to begin with. It feels like the car has a lowered suspension.

Best way to check is rub your hand against the tred, it will feel like a porcupine. 1 way will be smooth the other will be like going up steps
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