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Originally Posted by RandallNeighbour
Anyone willing to tell me the correct tire size for these rims? I don't want cupping from too wide a tire again, and I think that's what happened, but I'm not sure.
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225 is the correct width for a 7.5" rim. i worked at a tire shop in college; cupping is generally more a function of a poor tread design than tire / wheel width. also, mounting a directional tire to spin the WRONG direction will cause cupping. certain brands / models cupped no matter what; the rest didn't cup at all when properly mounted.
i think the real question is which tires have you been running on your car? btw, i run 225/40 18's up front on 7.5" wheels (as do virtually all base 996's / 997's) and haven't ever had issues w/ cupping.