ive seen one with a gsxr 750 and he has a 13 60 set up with 22'' tires.he said that he toped out around 90mph and it was geard low enought that he could ride in the yeard in 2nd.
imo the 47 is to small or to high.i would say a 13 60 for 22''tires or 13 64 for 25'.
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