The adapter and drive sprocket are now mounted on the output shaft, and the 7-speed cassette/freewheel threaded onto it. Unfortunately, I neglected to get a photo of the adapter on its own first. The output shaft has also been shortened at this point.

One of the two Hawker Genesis batteries is visible, suspended from the seat frame. The 12V batteries are wired in series to supply the 24V motor.

From the run of the drive chain, it is evident that the drive and driven sprockets are about the same size (24T, IIRC). The largest sprocket on the cassette driven by the pedals is a few teeth bigger (26T, again IIRC). The drive ratio from the motor back was chosen to allow a top speed of about 60kph, and the ratio from the pedals to allow a cyclist to provide some degree of pedal assist at all speeds.

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