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Old 07-10-2012, 09:34 AM   #3
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,505
Clueless.

Yes, the stickier rubber will improve lap times but going to a +1 wheel (18in in this case) would not change the gearing unless the owner was a complete idiot and didn't select a correspondingly lower profile tire to keep the overall circumference between the 17in wheel/tire and 18in wheel/tire the same. Same circumference = same gearing and no loss of acceleration.
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