Looks like a mini-ratchetting system. Like micro-indexing or something. So I am guessing that when you shift gears, the ratchet mechanism holds the derailer in place over the cog so you will not have the chain slip off if it isn't a perfect shift, like what happens in pure friction shifting? That would be a nice improvement over friction, as I have had the chain drop to higher gear when standing. Ouch!!
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