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I know Im a little late for this posting but this is the first time I came across such question. I do own a Trek Lime, purchased back in 2007. This is a fully automatic bicycle. It has 3 speeds a front hub dynamo (speed sensor), a shifter module-solenoid (computer) under the center frame, and the 3 speed auto-shifter hub in the rear wheel. As far as I know ...


As the Nuvinci system has been mentioned in other answers, I'll mention one more. SRAM makes the Automatix hub now. It's a 2 speed system (ratios 1:1, 1:1.37) with a centrifugal clutch. There's no manual shifting possible and no cables involved.


After watching both videos, I believe that whatever bent the rear derailer also bent the derailer hanger, which has your rear derailer out of alignment. The rear derailer/derailleur is that complicated part you replaced that moves the chain between gears on the rear, and also keeps the chain from getting loose and falling off. On most bikes, the rear ...

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