Max tire width

My 68 Dart is real close with some rubbing in and out with 245/60/15 and 15x7 rims that are 4.25" backspace. BUT the rear springs are shot and the car sit too low.[/QUOTE]

Springs will not correct the rubbing. The 245 tire will run w/the 4.5" b/s. A 235/60/15 fits like a glove w/the stock location.