i've been thinking of new ideas for how to drive the rear wheel. like how to use the drive sprocket without the rag joint or a hub adaptor. or how to do a shift kit without a jack shaft. looking at flip/flop dual drive hubs might be the answer. you could put the sprocket directly on the hub this way or put a locked casette on the left side this way, would need to build a derailer that worked backwards but it would eliminate the jack shaft. one draw back would be no coaster brake, any thoughts on this, lets hear what everyone thinks. link to flip/flops.
Flip-flop hub - Wikipedia, the free encyclopedia