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Old 05-30-2009, 01:20 PM   #3 (permalink)
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Location: Germantown, WI
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Stay with the 175s. The others are wider and will harm aerodynamics. It may not seem like much, but BMW did testing (there is a thread here somewhere on it) and Cd was noticably improved with a skinnier tire. Also, a wider tire will likely have increased rolling resistance.
Current project: A better alternator delete
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