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@Oddo
Stumbled upon one of these in the local classifieds a while ago.
The SRAM Truvativ HammerSchmidt 2 Speed Crankarms. They have a built-in planetary gear that can be engaged or disengaged for a neutral 1:1 or a 1.6 x ratio. Chain length and chain length remain the same so you could even ride it on an SSMTB I guess.
Some Reading here and here. And a very enthusiastic video from some bike fair in 2008(?)
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