Re: Top Speed, 80cc Chinese motor? what is the record?
I'll find that link that has the rpm/speed calculator for these bikes, it's a cool little program that someone made just for these bikes so you just plug in your sprocket size, and your primary gear ratio along with your tire size, then engine rpm to tell speed. This can be played with if you know speed but need to know rpm as well... I'll come back in here and post the link once I find it.