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Funny story, I was just looking into this. They seem really cool, but I'm worried about it shifting when the motors slow down due to the uncontrolled autoshifting on weird turns. I also am not sure what drives the shift. Love those bicycle gear hubs though.
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You can see shifting at just past 2:01.
http://www.youtube.com/watch?v=7LTZPrksqU0
I don't really see a simple way to shift these without limiting the rotation of each wheel, though.