[rwhite65]

I put 245 50 r16 in the back, with 225 50 r16 in the front. I used a set of 16X8 rims that were specifically made to go on a mustang (proper back spacing). My car has been lowered and the fender wells have not been rolled. I had problems with the tires rubbing, until I adjusted the supension a little in the front and rear to get it the rubbing to quit. I unfortunately had to raise the car a little bit from it's old lowered point.

They say u can put 17's in there, but I would not even attempt it unless you are willing to roll the fender wells.
Ryan