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racer_d · 05-28-2007, 05:13 PM

The 986 Boxster rear maximum width from the factory is 9"
The 996 Carerra (narrow body/ non Turbo body) rear maximum width from the factory is 10"

Going from 17" to 18" is a "plus 1" jump up. you trade rim diameter for sidewal thickness. The OVERALL diameter of the tire/rim combo (the wheel) will be within likely 2% difference.

18"s will provide crisper handling response (smaller sidewall) and worse pothole/bump protection and smoothness (smaller sidewall).

05-28-2007, 05:13 PM	#3
racer_d Registered User Join Date: Nov 2006 Location: Virginia Posts: 846	The 986 Boxster rear maximum width from the factory is 9" The 996 Carerra (narrow body/ non Turbo body) rear maximum width from the factory is 10" Going from 17" to 18" is a "plus 1" jump up. you trade rim diameter for sidewal thickness. The OVERALL diameter of the tire/rim combo (the wheel) will be within likely 2% difference. 18"s will provide crisper handling response (smaller sidewall) and worse pothole/bump protection and smoothness (smaller sidewall). __________________ 1976 914 2.0 2000 Boxster 2.7 (sold) 1978 911 SC (sold) 1970 914 w/2056 (sold)