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I was given a set of tires and not sure if they are OK for my 1999 Porsche 996 C4. They are 225/40ZR18 (Front) and 275/35ZR18 (Rear). Can they be used?
By offset I assume you mean something other than bolt pattern but rather how far the rims come out from the hub. What is the right offset? or is that dependent on fitting into the wheel well?