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Final Drive Considerations
Most motorcycle final drives use a standard industrial 14m pitch belt and pulley arrangement between the transmission (small diameter) and (large diameter) at the rear wheel. There is quite a vast selection of pulleys available from both OEM and after market sources in aluminum and steel amongst the various motorcycle brands. Selecting the most desireable ratio to begin with and changing later on if needed would be pretty painless. Good cheap used motorcycle parts are readily found just about anywhere.
For instance, on some of its models past and present, Harleys use a 70 tooth aluminum sprocket/pulley about 13" outside diameter with one flange integrally cast into it. It uses a wide belt but it could be easily machined down for our 3/4" wide belt requirement and match up nicely with the 14" Insight wheel.
Fastening the pulley to drive the Insight wheel must be done in a way that will not interfere with normal tire changing. The best way would be to use an adapter that does not alter the existing Insight wheel in any way and would be therefore entirely separate from it. This pulley adapter could also contain the necessary wheel spacer. The pulley/adapter assembly would slip over the 9" brake drum, would be deep enough to extend beyond the tire and would fit over the wheel lugs before mounting the wheel.
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