Originally Posted by MotorBicycleRacing
It's a Grubee 4G for the 5/8" shaft Huasheng or GXH Honda motor.
Looks like a 5:1 ratio
Totally right, the ratio i do not remember but the big pulley is a 100t and behind there is a 14t primary to the chain. The one in the chaft i thought it was a 10 0r an 8 i just cant remember. But with a 40T in the rear I get 35mph Top Speeds. And fairly fast, without pedaling at all and i am 190lbs.