wheels/tires 75 dstr

I'm running 15x7 Summit "Pro-Star" knockoffs, 4" backspacing and a 275/60/15 tire on my '75 Dart Sport. I have less than 1/2" clearance between the inner tire side and the spring. Clearance between the fender lip and the tire is about the same. I don't see how a 15x8 would have cleared with anything wider than a 255 series tire.

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