At an impasse with rear wheel/tire fitment

2 Darts said
I tried 255/60-15 on the cop car wheels on the Demon. Rear tire was ¼" from spring. Front tire would not fit under fender. I called Stockton Wheel and asked for recommendations. They advised 235/60-15 which is snug but workable. It bottoms out in the fender up front on turns. The next time I get tires for this car, I'm going to go to 225/60-15.

The cop car rims are 15x7 with a 4.25" backspace if they're originals. That's what I had on my Duster, with 225/60/15's all the way around. Even with the 225's I didn't have a ton of room to the rear springs, the BBP 7.25's are only like 51.5" flange to flange compared to the 8 3/4's which are supposed to be 52 5/8".

The 225/60/15's fit just fine up front, I didn't have any interference issues with those, although they do still sit fairly close to the fender. On the Duster I used the front fender-to-bumper braces to move the lower outer corners of the fenders out, but that's not a problem on a Dart because the wheel opening angles forward. That tire combination was actually how I set up the backspacing on my 18x9's with 275/35/18's, the outer face of the 275's is in the same place as the 225's were.