Hi Lone Ranger, I am an experianced motor-bicycle builder. Did you notice that the pic of Old No.6 that I posted here in this thread started out its life as a Ladies 10 speed mountain Bike?

Furthermore, I used the rotary clutch on it, along with the 2 handbrakes which were the origional topic.

Functionally there is very little difference wheather bike is 10, 12, 15, 18, 21 or more speeds. In some cases it becomes necessary to remove "people sprocket? derailer mechanism, if it will hit the engine, elsewise raise the engine.

It's all rather simple, really it is.

BTW do feel free to ask away, I am aware that all learning starts somewhere.

Mike

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