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      07-17-2012, 08:15 AM   #8
LarThaL
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Drives: 2011 M3
Join Date: Apr 2011
Location: West Springfield, MA

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I am running 12.5 f/r on ZCP wheels. Many with ZCP wheels are running 15f/12r with no issues (assuming stock sized tires). Since ZCP wheels are 4mm closer to the fender stock, you should be able to run 18f/15r no issue with non-ZCP wheels.

Increasing rear track width relative to the front will increase understeer.
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Audi S6 * Audi S3 * Porsche Cayman GTS
--Former BMW M3 owner