I'm new to StangNet and to Mustangs in general, and have a fairly pointed tire-size question that may or may-not have been covered (couldn't find an exact answer in previous posts.) I just bought purchased an '88 GT about two weeks ago—the car I've wanted since I was about 12-years old—and it needs a new set of sneakers. The suspension is completely stock, and previous owner installed 17x9 Cobra R wheels (not sure about the backspacing or offset) with 245/45/17 Dunlop's all around—which don't rub or hit on anything. My question is: I'd like to run 255/40's up front and 275/40's in the rear. I'm willing to flip the quad shocks, but don't want to go messing with much else . . . does anyone know if this combo will work? I'm open to any suggestions on alternative tire sizes. Thanks for your help . . . I have many other questions, but will hit you with them one at a time.