Hey i have been reading through a ton of wheel and tire questions on the site and cant seem to find any one that can give a straight answer.... Right now i am running 315/35/17 nitto drag radials. I just purchased new Saleen style reps in 18x 10.5 for the rear. The rep on the phone said that essentially an 315/30/18 will have the same measurements as the tire on the car now. I was wondering if there is anyone out there that actually is running a 315/30 or 35 / 18 on there 99/04 mustang without rolled fenders. I currently dont have rolled fenders and have no issues with rubbing as of now. The car has dd bullits in the rear now with the 315's The car has steeda springs in it as well. Thank you for your time and input Will i be able to put on a 315/30 or 35/ 18 without any issues???