Originally Posted by happycheapskate
So, if the Sturmey model can be driven backwards, and you have the motor chain turning it, how do you rig the pedal side? Are you using the rubber rag joint cog on the right side?
That is why I said if you can machine the hub to take a standard BMX freewheel, you could have it made, for purpose of this thread. I think it would be quite a high ratio though, on the motor side, in all 3 gears.
Who said any thing about peddles? heheh peddles are so out of style, and many states such as Washington, have remove the 'peddle' out of the moped(motorized + peddle ) clauses.
Trouble you guys get with the shifter in the back wheel is the step differences, where as in a jackshaft, you'll get far more reasonable steps.
I know the OP wants to stack sprockets and use a derailleur, but I'd forgo the engineering and use a light jack-shaft.