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      12-03-2012, 10:56 AM   #7
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Drives: 2011 135i - DCT M
Join Date: Nov 2012
Location: Texas

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Originally Posted by splitsecond View Post
Now that you mention 255's... where do people feel like we start to reach a point of diminishing returns with tire width? I know 255 is supposed to be noticeably better than 245, but is there much benefit in going up to 275 (assuming rolled fenders)?
I think the biggest problem with our cars on the track is understeer. The key to mitigating that understeer is more grip on the front. I would worry that going up to a 275 in the back without really making massive grip improvements on the front would do more harm than good. I'm not a pro, but that's just my sense.

I did 3 negative camber on the front with 10mm wider front and back. I had substantially less understeer and way better turn in.