I had a set of 28x9 slicks on our 69 Z mounted on original 15x7 rallys. Fit fine with no issues.
We daily drive it with 255/60-15's that have a 10.2" section width when measured on a 7.5" wheel. I have them mounted on a 7" wheel, and they also have no issues with rubbing anyplace. Car has factory tail pipes.
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