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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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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