With wilwood brakes,I am running a 245 45 17 tire on a 17X8 wheel and a 5.72 backspace. A 1/4 spacer will bring the wheel out more to the fender. I am running 285 40 18s with 18 X10s in the back with street lynx More here http://www.cuda-challenger.com/cc/index.php?topic=75207.60 https://board.moparts.org/ubbthreads/show...e=2#Post6313383