63-66 Dart. How wide of a tire on the back?

I always find these questions interesting. There is 5" from the front of the brake flange to the spring. How can you have a rim with 4" of back spacing and still have 1" of clearance from the spring to the tire?

The biggest rim/tire combination on a '65 Dart is 15x7 with 3.5" of back spacing. This is a factory steel 15x7 rim from a Cordoba. The biggest tire is p235x60. This combination centers the tire within the wheel well with about 1/2" clearance between the springs and fender lips.

If you are going to use this combination, I would replace the rubber bushings with poly to limit axle movement to a minimum.

I don't see how anything bigger would fit without moving the springs.