Probably going with 1" or as small as 3/4" depending on availability. It won't make much difference in performance on this little kart. It has a 6.5hp engine! At the time my brother got this thing I weighed about 295-300lbs. It would haul me around at 30mph. With my wife driving, it would run close to 40mph and throw a 10-15' long rooster tail of gravel. It's pretty stout for a kart.
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