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Gotta say that one of the first things I noticed when I got my M3 was that the car just needed more outright grip. However, if you want to stay with exactly the same overall tire diameter and stagger and go to wider tires, you will need to go to a 285/305 set-up. I do not believe 285's will fit in front regardless of what wheel configuration you use. Also, when you go wider in front, you lose steering feel and responsiveness.
I'm thinking 255/295 is probably the way to go. Good rear width. Front width not so much as to diminish responsiveness, equal front and rear diameters for 255/35 and 295/30 on 19" wheels. Not sure how much more understeer you will get with this set-up, however.
What do you all think?
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Audi S6 * Audi S3 * Porsche Cayman GTS
--Former BMW M3 owner
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