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      01-15-2012, 08:46 AM   #2
Kgolf31
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Drives: 2007 Z4MC, 2012 128i
Join Date: Sep 2008
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Quote:
Originally Posted by Dubbedown View Post
Considering a square 17x9 setup for the track. 255/40 maintains the stock ride height of 25" but I wonder if that's too much sidewall? Am I better off going 245/40 even though that's shorter than stock height?
Going shorter will produce slightly more torque, but you'll run out of top end quicker.

The sidewall all depends on what tire you go with. Go with a tire that has a very soft sidewall you might run into problems with roll over.
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