I've just started my spoiler project and 1st thing I changed the seat!, Then I took the original tire off and put on a 130/80x16 rear. It just fits .I want to install a Honda GXH50 chain drive, but there's no room for the drive chain? On the right side I have my pedal chain and on the left I have my disc brakes.If I took my disc off, there's no chain clearance! So I thought about another friction drive but the normal roller drive housing is 3.5'' inside width & I need 6'' to make It work. Any suggestions??