Re: shifting
the only way I could see it working, is having a sub shaft with a set of sprockets that could slide back and forth, an old cassette would work, but it would have to be locked and able to slide.. then you would have to be able to use an old derailur and somthing to lift up on the chain when you wanted to shift... would lift on 1 thing, then push the cassette in line with the sprocket you want.. kinda complex, but it's the only way I see it working
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