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Thread: Derailleur help

  1. #1
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    Derailleur help

    Today I went riding and had a derailleur meltdown. Before the ride I checked and it was shifting crisply with no issues. Midway through the ride I noticed that it wasn't shifting to the biggest half of the cassette. It progressively got worse and then wouldnt even shift out of the smallest cog. What could be the culprit?

    I checked, cable tension is fine and it's installed correctly. Hanger looks straight and everything seems to be moving fine.

    Help would be greatly appreciated.

  2. #2
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    Here are some causes of bad shifting:

    http://www.shimano.com/publish/conte...20Shifting.pdf

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    Ordinarily, this would be because the cable tension somehow got lost, but you say its okay. From this description i would narrow it down to the shifter being the culprit. I would pull the cover off of your shifter and check that the cable head did not become lodged or even sheared off.

    P.s this is my first post on MTBR but i am a bike shop mechanic of five years, hope this helps.

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    I had something like that happen with my road bike ,turnd out the shifter was broke.

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    Quote Originally Posted by NRBtwintip View Post
    Ordinarily, this would be because the cable tension somehow got lost, but you say its okay. From this description i would narrow it down to the shifter being the culprit. I would pull the cover off of your shifter and check that the cable head did not become lodged or even sheared off.

    P.s this is my first post on MTBR but i am a bike shop mechanic of five years, hope this helps.
    Best first post of the year award I think!
    It's all Here. Now.

  6. #6
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    Quote Originally Posted by rockerc View Post
    Best first post of the year award I think!

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    Will it shift if you pull the cable by hand? If so, it is likely the shifter. Also look for tiny stones that may have gotten into the stop points. I had that happen and for no apparent reason I couldn't shift.

  8. #8
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    These are really good ideas guys. I'll check into them in a bit. It will not shift if i pull it by hand. I guess what I can do is get a new D cable and check all the stop points and see that everything is good.

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