wheel/tire size (71 dart swinger)
Here's my 71 with 15 x 7 cop car rallies on the front and rear. Backspacing is 4.25 inches on these rims. I've got the fronts at 225-60 and the rears are 245-60's. I'm fairly certain that if I had another 1/4 inch of BS I could fit 255's back there (someday).