I am about ready to purchase a set of 18 inch Roush Chromies, and am curious if I will have any problems fitting them on a 99 Gt convertible. Will the wheels rub on the walls when I turn? Are there other issues I need to consider before purchasing these rims. I know nothing about tires, or rims for that matter. I do know my car has 17 inch O.E. Rims on it currently, and they don't rub at all. Any information will help a ton, and thanks in advance!