Starfire, Grubee, I got mine from powerking, and I seem to have a couple thousand rpm more than what most folks here are getting. I could just be lucky, but my 80(70)cc screams into a heavy powerband. 35/37mph on a 44 tooth with a 20 inch tire, which according to some people here isn't possible. Bike seems to hit full speed then bogs for a second then waaapppp!!! almost like second gear. That may just be mine though as far as I hear it just depends.