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      01-26-2008, 01:09 PM   #10
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Originally Posted by e46e92love View Post
Mark, would say that the reason why 18s are better is mostly because of weight? And if that is the case, then 19s that way the same or less than 18s will perform the same?
Even at the same weight the 18's will slightly outperform 19's, because the 19's will carry more of it's weight towards the outside of the wheel/tire combination, the rim is still further from the center, giving a larger moment of inertia, requiring more energy to spin up and slow down.

The smaller sidewalls may give better response at turn-in but you'll give it up in harshness and small bump absorption. It's not like comparing 35 series tires to 50 series tires in either case. I have 18's and 19's on my Cayman and swapping between them the degredation in ride quality is noticeable, but the 19's look better, even on a small car.