Originally Posted by decoherence
the smaller the sprocket is made for higher speeds. the opposite of 20mph. not even sure if a china girl can even make enough torque for a 22 tooth.
if you want to only do 20mph then you are looking for a large sprocket. like 40t.
My wife's 80cc is set up with a 48T sprocket, and it idles at 33kph/20mph when warmed up. That's on a 26" wheel. A 24" wheel would be a little slower.