Originally Posted by Chinookmark
What about two sets of sprockets mounted, and a slider with a handlebar lever, like the gear change on a bicycle? It would be like a two speed, but actually be a twelve speed.
Interesting thought, but let's remember that a bicycle has a tensioner built into the chain drive at the rear derailleur. I'm not so sure that technology would be portable to a system where the chain is much more massive and the power delivery is much greater. And even if it is something that would adapt, there would then be another item on the bike that's got to be maintained. If it's kept at the rear wheel as on a bicycle, that is more unsprung weight.
Yeah, I know. You see blue sky, I see clouds.