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Any DOT approved tire is legal, even in stock classes. So VictorRacers/Ecsta V700's, Hoosier A3S03/R3S03's, Yoko A032R's, and probably a few others are legal. You just can't run road race slicks.
If you're willing to modifiy the fenders, I think several of the heavier (heavier than a '89 civic hatchback) National cars are running 275's on 9.5 and 10" rims.
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