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  1. #1
    RoadBikeReview Member
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    head broke off cable bolt front derailleur

    I think it is called an anchor bolt.

    I rarely have to switch out of the big ring (no climbs local)....anyway I went out to jump on the bike for a ride today and noticed the front derailleur bolt that holds the cable had broken off clean. Odd, since I never really use the small ring and did not bump it.

    Glad it happened at home than on a ride, I noticed it when I went to lube the chain and when I spun the crank it popped off the chain.

    So, how do I get the rest of the bolt out if the head fell off? Can I use a screw extractor (was googling)?

    I've never had this type of issue before and want to not ruin the ultegra front dérailleur! Any help or insight would be appreciated.

    I think I drill a small pilot hole and then use a screw extractor set? will need to be so precise as the bolt is so small.

  2. #2
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    Time for a trip to either your LBS, or (better yet) your local machine shop. Machinists usually have clamps and vices that can stabilize most odd-shaped items, and drill presses that are worlds away in accuracy of most home shop tools.

    A good machine shop would probably be able to bore a pilot hole and "easy-out" the bolt shaft. I don't think it would cost too much.
    Bill in Pasadena

  3. #3
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    Quote Originally Posted by superflylondon View Post
    I think it is called an anchor bolt.

    I rarely have to switch out of the big ring (no climbs local)....anyway I went out to jump on the bike for a ride today and noticed the front derailleur bolt that holds the cable had broken off clean. Odd, since I never really use the small ring and did not bump it.

    Glad it happened at home than on a ride, I noticed it when I went to lube the chain and when I spun the crank it popped off the chain.

    So, how do I get the rest of the bolt out if the head fell off? Can I use a screw extractor (was googling)?

    I've never had this type of issue before and want to not ruin the ultegra front dérailleur! Any help or insight would be appreciated.

    I think I drill a small pilot hole and then use a screw extractor set? will need to be so precise as the bolt is so small.
    Remove the derailleur from the bike.
    Center punch, drill/bit, extractor, steady hand, and patience.

  4. #4
    wim
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    As far as I know, almost all Shimano front derailleur cable pinch bolts thread into a steel nut loosely placed into a counterbore on the pull arm. If this is true on your derailleur as well, just push the bolt remains and the nut out. You may have to file off a burr or two where the bolt head used to be.
    Last edited by wim; 03-11-2013 at 05:32 AM.

  5. #5
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    Wim, thanks for posting that.

    I had a better look today and cleaned out all the road junk (Canada winter beater bike Cervelo 2009 S1) and where the head broke off it was clean/flush with where the threads begin but mine does have the bolt on the back.

  6. #6
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    In this case give it a test on pushing it out, while it is still on the bike (punch and few light hammer taps). If this doesn't work take it off and place the part on a wrench socket (just larger than the nut but still supporting the surrounding metal) and tap it with a punch and hammer.

  7. #7
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    Thanks everyone the bolt just popped out, just now have get a new nut/bolt. awesomeness.

    The part was so caked in road grim, salt...etc was hard to tell it was just a bolt and not a threaded part inside the front derailluer.

  8. #8
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    now trying to find a replacement nut online...

  9. #9
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    Try a LBS, shouldn't have a problem getting what you need.

    And maybe you could wash and inspect the bike while searching for those parts.

  10. #10
    wim
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    Quote Originally Posted by superflylondon View Post
    now trying to find a replacement nut online...
    It's just a standard metric steel nut. Bike store, Ace Hardware, or some such place.

  11. #11
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    Inside the derailleur it is not really a standard nut. The whole where the nut would sit in is round, and inside it has grooves like a star where the nut would grab onto. I'll post a pic later tonight.

  12. #12
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    As promised a pic of the hole the bolt sits in. Not a standard nut, I think i might just be able to get away with something that does not sit in the whole fully but just would bind up against the hole as I just need to pin the cable inplace. odd that I can't find a bolt nut combo online....grrr.

     photo 20130318_203820_zps992fe0ac.jpg

  13. #13
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    and yes it is dirty...I'm in Canada and it is on my winter beater (2009 cervelo s1).

  14. #14
    hle
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    Quote Originally Posted by superflylondon View Post
    and yes it is dirty...I'm in Canada and it is on my winter beater (2009 cervelo s1).
    I have the same problem... did you find a new one?

  15. #15
    wyrd biđ ful ărćd
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    Are you able to try remove the remaining bolt that is in the nut? Then you can just source for a bolt.

  16. #16
    hle
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    Quote Originally Posted by c_h_i_n_a_m_a_n View Post
    Are you able to try remove the remaining bolt that is in the nut? Then you can just source for a bolt.
    I don't know how. I tried to drill it out... but no success.

  17. #17
    hle
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    Quote Originally Posted by hle View Post
    I don't know how. I tried to drill it out... but no success.
    Now I managed to drill it out. Just had to use a better drill put some oil on it and drill slowly. The bolt itself is standard. I have several spare ones. Just had to shorten it a little bit.

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