What would be the largest rim and tire combination (taking backspacing into account) for filling the wheel wells of a 67 firebird with 15" rims without rubbing the sub frame or fender wells. I currently have 4 American Racing TT Two's 15"x8" with 3.75" backspacing with 235 60 15 on the front and 255 60 15 on the back. The front currently rub the sub frame on sharp turns and rub the upper fender trim on big dips.
