I have a 81 cutlass supreme when I first bought the it had 275/60/15 tires on the back I wanna know what's the widest tire I can go with Idc if it sticks a inch or inch and a half past the wheel well but just no to much and need a idea with what backs pacing to go with on rims right now I have 255/60/15 on the rear with a 15x8 rim and 3.75 back spacing all the help I can get will help just don't want to tub the car