What you need is some sort of sprung device to move the chain so that it is in line with both the cog, and the front chain-ring ...
? :)
Unless you means gears...rear derailleur ;)
Wow, thats a great idea, quick patent it! ;p
(Yeah it should be absolutley fine as a srs answer)
@JWestland started
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What you need is some sort of sprung device to move the chain so that it is in line with both the cog, and the front chain-ring ...