What size tires will fit on stock dart 15" wheels?

1970dartcustom said
on overall diameter on the list for the P245/60R15 it says 26.54.
on overall diameter on the list for the P215/65R15 it says 25.98.
So, that means that the rear tires will still be .56 higher than the front?
Also, going by each size's recommended rim width, it looks like 7's all around will still fit both...
So, you think this would work? Or am I missing something?
Thank you so much for your help...

Yup, rear tires would be taller. Not an issue unless you're planning an autoX car or road races, but then you wouldn't be looking at 15" rims.

The 15x7's in the rear would be a better fit because of the +6 offset. With an 8 3/4 that would be the minimum I'd use, even with a SBP set up (BBP adds to the track width). But that's for a car with the stock spring locations.

1970dartcustom said
Also, I'm running 383 with 8 3/4 and 727... lots of HP on those rear tires... will 8 inch tread be sufficient?
With 3/4 offset springs n such, you said +6mm offset was good which is what the 15x7's are...
the list says I can fit P255/60R15 on a 15x7 wheel and the tread width would be 8.2

How much hp is "lots"?

The problem is that you can't fit a lot of tire back there. You probably need more, but you can only fit so much. On a Dart with the stock spring locations you only have about 11" of room between the quarter and the springs. If you figure a 1/2" of clearance on each side, now you're down to 10". If you consider that has to be the widest part of the tire (the section width) then you're down to an 8" wide tread, and that's with only a 1/2" of clearance all around.

What I said was that a +6 offset on a 15x7 was ok for a SBP 8 3/4 with the stock spring location. That's the minimum I'd use, and only because of the SBP axles. That's not considering the spring offset. You need to confirm if you have a spring offset. If you do, you can run bigger tires than the 245's, but you'll need more backspacing to do it.