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I had Hoosier qucktimes in 325/50R15's and they were almost an inch wider than the same size BFG drag radials.
So a 315-60 might fit a 15x8 ralley?
You can get away with the 315/60 15 or the 325/50 15, both are 11" wide tread. Mickey Thompson doesn't reccomend it, but I ran the 325/50's on an 8" wheel for a couple years. They looked a bit "balloony", but wore ok. Lorne