Oh I know that's why I will have a 6inch pulley to a 3
Wait, what?

Ok I need to know the speed of the jackshaft to axle ok so I have a 10 tooth to a 25 and on the other side of jack shaft is a 13 to a 55 tooth. I have 16 inch tires and I'm 150. Frame is about 100. Pounds. Engine is 212cc and or 3600rpm
All I'm doing is making a 5 to 1 gear ratio so I'm just going to find the chain size of the sprocket on the axle and have a 12 tooth to a 55