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Retro-direct

Yes, it's a little mind-blowing.

First you think it could never work. Then you realize it does work, but you think it's such a crazy and immature technology that it could never work well. But for a "pure" retro-direct, the chainline doesn't move at all, so it should be possible to make it almost as reliable as a normal singlespeed?

caveats (that can be worked around)

see [1]

downsides

real-world gotchyas / practical improvements