Re: Integrated motor mount and jack shaft
Sprocket #1 is 18T (14T would be better). #1 should not be a freewheel, I welded it so it would be a standard sprocket.
Sprocket #2 must be a standard bicycle freewheel. This will prevent the pedals from turning while under motor power.
Sprocket #3 is a 10T (#41 sprocket with teeth cut thin to accept standard bicycle chain).
The motor mount is slotted for adjustment of the chain tension of sprocket #2(going to the chainring).
Sprocket #3 needs only the derailure for tension.
Sprocket #1: The bearing housing was welded in place with the chain installed. Due to it's short length, chain stretch is minimal. However I did later install a u-bolt to slightly flex bearing mount to take up the (minimal stretch).
I have many, many miles on this system and it functions well.
Last edited by Russell; 04-24-2011 at 02:15 PM.