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Depends on how fast you want to go. I would say 40's would be the VERY SMALLEST tire I would run, but would look for some 44's or bigger. Maybe some surplus military tires in the 52" flavor.
I agree with that guy, the rock wells are geared in the 6.? range so if you want any decent rpm's you need a large diameter tire, also you have the huge pumkin to deal with that may afect steering and crossmembers /forums/images/graemlins/thumb.gif