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Tuke,
My car had 18s on it when I got it and I stepped up to 19s. I noticed no difference in ride quality or noise. Based on my experience with other cars, stepping up from 16s to 19s will cause a noticeable difference in ride comfort, but not a whole lot of difference in noise on new tires. As those 19s wear they may start to get a little noisy. The handling will be better with the 19s over the 16s because there's so much less sidewall flex. I'm told, however, that the Boxster handles best with 18s. I chose the 19s for aesthetics and didn't notice any handling difference over the 18s.
I wouldn't describe the ride I'm experiencing as harsh by any means. The car isn't rattling my teeth out or anything. I think the ride is comfortable and quiet, but it's not a Coupe deVille. I definitely know I'm driving a sports car.
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