Quote:
Originally Posted by itsnotanova
I've had 2 sets of 17's, 3 sets of 18's and one set of 19's on my boxster. I couldn't really tell any difference between 17 and 18 inch wheels. I think your tires have a bigger influence on ride quality. I didn't notice much of a performance difference either. The 18's I have on now weigh less and ride better than everything I've had so far. Not by much, but a little. 19's were horrible though. Not so much the ride quality. They were boat anchors and I could instantly notice the performance loss
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This was my experience over a 10 year period with my 986. As long as you use quality light weight wheels there is virtually no difference in performance or ride quality. The one very perceptible difference is that 18" tires cost about 25%-30% more than 17s for the same widths and tire model so you WILL notice a difference at the tire shop.
RobertKing is kinda new around here so we can forgive his misunderstanding of final tire circumference.