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Old 04-24-2011, 01:32 PM
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Russell Russell is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: MA
Posts: 1,144
Default 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.
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Last edited by Russell; 04-24-2011 at 02:15 PM.
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