Rear tire width max for 67 Barracuda

You dont need to roll the 1/4s to fit any of them if the backspacing is correct. 15X8 with a 4.5" backspacing should be perfect. Mine were 15X8.5 with a 4-7/8" back spacing. Even the 255-60-15s were real close to the springs till I moved them. The 325-50-15s were to wide for the rims so I swapped them for the 275-60-15s which were perfect but would have been to wide on those rims with the stock spring location.

I later mini tubbed it and could have easily fit a 14" wide tread under it.