When I changed out my 17" stock wheels for 18" Gemballa Competitions, I honestly could not tell any difference in ride quality or handling. But then again, I don't track my car......yet. The front's are 8.5" wide and the rears are 10" wide. No spacers were required and they fill out the fenderwells perfectly. Spacers may be required with Porsche wheels, but an aftermarket wheel can be bought with the correct backspacing so spacers aren't required.
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