Mid drive as a jackshaft

Aug 14, 2019
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My next project will be a trike and I'm thinking of dipping a toe into the electric pond.

I would like to keep the drive somewhat hidden and think behind the seatpost would be a good spot. For what I have planned, I'm pretty sure the BB will need be moved forward and up for the pedals. My thinking is to mount 2 sprockets onto the mid drive (minus the cranks). Is there any reason this wouldn't work?