15X7 w/4in BS Tire Size Question

autoxcuda said

Are you running small bolt pattern original axles? Including original axle re-drilled for LBP?

OR aftermarket or shortened large bolt pattern axles?

With small bolt original axles, I've run 4.25" backspace rallyes with 245/60/15 on my 68 Dart. Close on inside and outside with a very low leaf spring worn out rear end.

LBP aftermarket/shortened axles move the axle flange out 1/4" or so. Then you will need 4.5 backspacing.

Click to expand...

I'll add to these questions, which front brake are you using. With the 75 BBP disk brake setup I've tried a 255/60-15 (does not work), 235/60-15 (works with fenders adjusted outwards), 205/60-15 (no problems at all). The first two were attempted using 15x7 cop car wheels, the latter with 15x7 Magnum 500s. All wheels 4¼ inch back spacing.

At the rear, the 255/60-15s were less than ¼ inch from the leaf spring. The other two fit with no problem at all. The axle was an A-body 7¼ BBP.

Hope this is helpful.