What size tires will fit on stock dart 15" wheels?
Is your car still factory SBP or converted to LBP and disc's up front? As others have said this will affect what offset you need to buy. In the end a rim, large square and tape measure help a lot or a Percy's wheel rite.
I agree with Dano. Can you buy a single (or a pair) 15 X 7 wheel and bolt it on the rear without a tire. Measure off that wheel and draw a diagram showing how much clearance there is to the spring (front and rear of the spring ) and to the outer wheel lip and inner fender. Measure both sides of the car! They probably will not be equal. Expect up to 1/2" difference per Mopar Performance.
I do not have personal experience with early 70's Darts but it looks like Joe's car is what you have. Pat attention to what he says. Looking at his pics, you have an advantage because of your spring offset. That's good but look past the spring to the top of the tire and notice the clearance to the inner wheel well. Not much.
Fact...Factory Chrysler 15 X 7 wheels have 4-1/4" BS, no matter the style. These typically fit.
A good rule of thumb is to keep wheel width within 1/2" of tread width to get good tire performance. If you want 8" tread, an 8" wheel is perfect. Do what you can to use the 8" wheel even if it means ordering a custom offset. I don't know how that affects trim ring fitment on Rallyes.
My opinion is that a 215-65 on a 15 X 7 front wheel may be a little tall without trimming the lower fender lip. A 215-60 is a little shorter and gives more clearance. As mentioned already, it's not just the width, the diameter is equally important.
P.S. Nice looking car Joe.
P.P.S. poly bushings in the rear shackles will take out some of the rear side-to-side movement if your tires are close to the body.
