50mm recommendations for friction drive?

yoyoman

1 kW
Joined
Jun 9, 2008
Messages
477
Location
San Diego, CA
I found a Dahon Boardwalk S1 for $40 and was hoping to put a "Commuter Booster" friction drive kit on it. Unfortunately, the used package I bought has a 63mm motor that will hit the chain. I'm thinking 50mm is my only choice.

So, does anyone have any 50mm recommendations? This bike will just be for a 2mile commute.
 
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