My car is a 1992 Classic Roadster built by lonestar back in the day.
Anyway my car did have 295 50 15's on the rear.
Once in a while they would scrape (on the edge)
with some weight, going over a dip or bump, but not too bad.
I now run 275 40 17's on the rear and 235 45 17's on the front.
I have no problems with clearance now.

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The older I get, the faster I was........
So now I'm so fast apparently I appear to be standing still.