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FWIW I've got a set of OEM 17 inch Boxster II wheels with Michelin Pilot Sport 2 N3 tires in the OEM size and a set of 18 inch Lt. Alloy Carrera wheels also with Michelin Pilot Sport 2 N3 tires in the OEM sizes. I weighed them and I think the fronts were about the same weight and the 18 inch rears were about a pound heavier. And on the street I can't really tell the difference between them. I've only used the 18's in the few HPDE's that I've done.
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