Would love that... considering you could squeeze a cyclo triple with 1/8 cogs on the splined driver with the longer SA axle, threading on a 5 speed might be doable and believe I have seen where this was done.
I have a Moulton F series in the works and a drive set up like this might just be the bomb for what will be a full on road bike that needs an internal hub to give you any kind of decent road gearing... was thinking a three speed with a dual drive would have been a good way to go with this instead of the stock 4 speed IGH as it would tighten up the gear steps.
Would of course have to swap the internals to a shell for 28 spokes as this is what the Moulton rims use.





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It sounds like the guy that sold you the bike is a standup guy, something that is rare these days.

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