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Just go read the sidewall of the tires. It will say what size they are. 15s were common on the SC and early Carreras. I really love the look and performance of the 17s. The only downside is they are indeed more mass, and acceleration is indeed a bit less, but cornering and braking is massively improved. Just the ability to buy good summer performance tires that work great in the rain or dry is a big plus.
I was having to by tires designed for minivans for my last set of 15s.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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