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Originally Posted by pbanders
FWIW, a friend of mine just got a new Cayman S with 19's. with PASM. As a passenger on a drive of a few miles with him, I didn't notice it was any harsher than my Boxster with 18's and no PASM. Perhaps more driving would have revealed a difference, but it wasn't immediately clear it was harsher.
I'd go with the 18's. Tires are cheaper, wheels are lighter.
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New body Boxster/Cayman was designed to ride on 18's like ours were designed to ride on 17's. They are set up for bigger diameter...so the sidewall on a 19" wheel on new car is same as sidewall on our 18" wheels. If we move up to a 19" we have a thinner sidewall than a new body cayman/boxster with the same size wheel.