Tire size for 70 Dart

With the stock spring locations and wheel houses on a Dart the best you’ll do is a 255, and some cars can’t even manage that because of body tolerances. I wouldn’t say a 255 is a safe bet for everyone unless you’re willing to do some work on the quarter lip. Some clear fine, some won’t.

A 1/2” spring offset will let you run up to 275’s with the stock wheel houses on a Dart. For 295’s you’d need a full 3” spring relocation and mini-tubs. Not gonna fit those in the stock wheel house on a Dart.