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Shimano 70gs rear derailleur won't shift. The thumb levers move but don't engage. Can I fix it or will it have to be replaced.

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  • soccraig Jul 26, 2009

    Yes, the cable is still attached. The thumb levers move freely and don't engage yet the cable appears to be attached at both ends. I can't see how to remove the cover on the levers to see what's going on inside.

  • soccraig Jul 26, 2009

    I don't believe it's a cable adjustment issue. When I operate the lever the cable is not moved at all. It's like the levers don't engage at all. They went from working to not working all at once. No resistance in moving the levers at all.

  • soccraig Jul 26, 2009

    I don't believe it's a cable adjustment issue. When I operate the lever the cable is not moved at all. It's like the levers don't engage at all. They went from working to not working all at once. No resistance in moving the levers at all.

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I just had the same problem with my wife's old bike. After removing the cover (as explained in answer #2), I saw that the pawl (the part that engages the ratchet)was stuck in the open position because the grease had dried up. A shot of pbblaster (or WD40) freed it up and everything is now working fine.

Posted on Mar 20, 2010

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Loosen the cable from rear remove philips screw from front control, push the cable so that the stop pokes out beneath plastic cowling pry cowling off. There's a plastic clockwork gear that trips the handle... the gear is probably broken...

Posted on Jan 07, 2010

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Is the cable still attached ? have you tried adjusting the cable?

Posted on Jul 26, 2009

  • mike fuson Jul 26, 2009

    Is there a jacking screw around the cable for take up? try adjusting that.

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