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      01-03-2013, 03:12 AM   #6
Drives: AW '09 E90 328xi
Join Date: Oct 2012
Location: Toronto

Posts: 514
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The wider rears do add to understeer because it gives the car a wider stance (ie. wider turning angle). Square setup would reduce the understeer.

for 18x8.5 wheels, 225/40 or 235/40 on all corners will work well if you want square.
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