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  1. #1
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    Chilcotin Chain Drop

    Hi all,
    Since I built my Chilcotin up I've had a problem with the chain dropping when shifting from the 3rd or 2nd smallest cog to the smallest cog on the sprocket.

    I'm attaching some pictures to illustrate the situation:
    Chilcotin Chain Drop-img_20130922_144437.jpgChilcotin Chain Drop-img_20130922_144512.jpgChilcotin Chain Drop-img_20130922_144524.jpgChilcotin Chain Drop-img_20130922_144731.jpg

    2 bike shops and 3 bike mechanics later the situation persists.

    Because the only new part on the drivetrain was only the chain I was thinking that perhaps the RD and the sprocket were the problem since they looked pretty worn out (got about 1,300 miles on them). So today I got a new sprocket and a new RD + shifter, put them on and... same thing. The chain would randomly drop when shifting.

    My setup is:
    Shimano XTR M970 crank, Hope BB w/ 1 spacer on drive side, Race Face single chainring 34T, MRP G3 chainguide, SLX sprocket 11-34T, Saint M820 RD, XT chain, Hope rear hub.

    Chilcotin Chain Drop-img_20130922_144640.jpg

    Any help would be appreciated. I'm totally clueless on this.

  2. #2
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    I assume you've adjusted the stop screw on the derailleur so it cannot swing past the last cog?

  3. #3
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    I recently had this problem. The Stop Screw on the derailleur, as mentioned above, was backing out. It was a Saint 10sp with clutch similar to yours. I ended up putting blue locktite on the screw, and that stopped the problem. It took me a few weeks to diagnose the problem, since I did not think those screws were able to do that. Maybe it is the clutch putting a much larger spring rate on the RD than other derailleur types. At least your paint is still in good condition...mine, not so much.

    PS: Killer Orange Chilly, by the way! I love that color!
    Regional Race Manager, Knolly Bikes
    Washington State, Australia, New Zealand, South Africa
    ~~~KNOLLY KNATION RACING~~~

  4. #4
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    Quote Originally Posted by honns View Post
    I assume you've adjusted the stop screw on the derailleur so it cannot swing past the last cog?
    Picture #2 looks like its off to me. Screw in the 'high' limit screw.
    I support EMBA

  5. #5
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    Quote Originally Posted by Muttonchops View Post
    Picture #2 looks like its off to me. Screw in the 'high' limit screw.
    And find a new mechanic. This is basic stuff for a bike mechanic.

  6. #6
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    as the others have said,,, make sure the limit screws are correctly set,,,
    check mech hanger isnt bent,,,,,
    check cable tension,,,,,,

  7. #7
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    Thanks for all the replies.

    Yes we did adjustments to the H limiter screw until it was real tight but after a couple of tests in the parking lot chain still dropped from time to time especially when doing multi-release shifts from 3rd to 1st.

    Tried a new mech hanger. Same thing. Also checked cable tension.

    Tried with and without the mode converter. Same thing.

    Will try the blue loctite as suggested by rdhfreethought.

    Still baffled but again, thanks for all the suggestions.

  8. #8
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    Quote Originally Posted by B Gillespie View Post
    And find a new mechanic. This is basic stuff for a bike mechanic.
    +2..

  9. #9
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    Quote Originally Posted by bionicman View Post

    +2..
    +3...
    H limiting screw not properly set,
    I dont think that screw will loosen itself that fast in a parking lot testing.
    When trails gets tougher, Just stand up and deliver.

  10. #10
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    Check for proper chain length too,
    When trails gets tougher, Just stand up and deliver.

  11. #11
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    Mine has done this two or three times despite the limit screw being set correctly (my paint did not survive either). The only thing that has stopped it is to adjust the limit screw in too much which makes it so it's very difficult ( in fact it won't most of the time) for the chain to even drop down onto the smallest cog. Not ideal but better than having the chain drop off. Any help/suggestions would be appreciated.

  12. #12
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    Are this happening on Saint RD only or with the other brand too?
    I'm using 10speed X.9 and never encounter this...
    Sounds not a limiting screw problem then???
    When trails gets tougher, Just stand up and deliver.

  13. #13
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    Same thing happened to me with an 10 speed XT w/ single chainring up front. Never tried SRAM tho.

    KRob, I once adjusted the limit screw so chain couldn't drop to smallest cog when I was on the trail cause chain kept dropping.

  14. #14
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    Could it be that the angle on the chainline is too severe? Maybe the chainring needs a spacer or two to move the chain line into the center of the cassette?
    "My riding style - like I'm being chased by a clown." - rscecil007

  15. #15
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    wow
    it happend to me with long x9 and with my new xt meduim cage....
    thoght it was the hanger problem....
    but it happend only when i attack in high speed rock gardans style trails...

    and yess no more anodized black....

  16. #16
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    This is interesting, I'm runnin the same Saint RD as ranwar and I have never dropped a chain yet on my my xt 2 x 10 setup. I just checked my limit screws and the high limit screw is almost in the exact same position as yours. What shifters are you using? I'm using the saint shifter for the rd.

  17. #17
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    I'm using a Saint shifter.

    Just out of curiosity, what rear hub are you using?

  18. #18
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    mayby it happned more to a one plate x10....
    and we should Invest more time finding the middle of a chain line

    im going to put the new raceface nerrow wide chainring so I'll start from scratch in an attempt to balance the system....

  19. #19
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    Might be M820 - related issue. Have the same derailleur too and it works perfectly with 10sp XTR- cassettes, as well as XT`s. But same problem with SRAM XX1 and SLX- cassettes, shifting is shi*ty from 3rd smallest to 2nd smallest to smallest. Ok when shifting from smallest upwards. No chain dropping, only smooth operation is missing. In my case same happens with Saint and XTR shifters and it`s not either wheel related, XX1 does the same trick with any rear wheel Ive.

    Been too lazy really to find out problem, maybe I have to...

  20. #20
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    True in my case. Shifting from 3->2->1 is rough but not other way around. Haven't tried with XTR or XT cassette tho.

  21. #21
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    This happened to me as well. I fixed it but it was so long ago that I'm not completely positive what I did exactly. I have X9 10sp set up and I believe it was a combination of the limit screws and set screw. Many folks are also having issues with setting up their 10sp drivetrains. I'm a pretty proficient home mechanic and never had issues with 9 speeds. Wish I had better beta for you.

  22. #22
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    Quote Originally Posted by ranwar View Post
    I'm using a Saint shifter.

    Just out of curiosity, what rear hub are you using?
    I have a Hope Pro 2 evo hub on flow rim. Runnin a XT M771 cassette

  23. #23
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    I would check on the b-tension screw. If the derailleur is not the right distance from the cassette, you will get weird shifting anomalies.

  24. #24
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    post pictures to show rear mech position in the top and bottom gear on the cassette, position will tell us if the chain is the right length.

    if its the right length then might be the chain line...due to front mech being fitted wrong...compare chain line with other bikes so see if you have an unusual angle.

    else your shift limiter on you rear mech is faulty....assuming your Freehub body isn't squint which would be quite unusual. next and final step would be to check the rear mech hanger / frame is straight.
    Last edited by cfrench; 09-28-2013 at 11:04 AM.
    2013 Knolly Endorphin | 2013 Knolly Chilcotin | 2014 Knolly Podium.
    "think hedgehog not starfish" - delirian

  25. #25
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    I doubt any of your so called mechanics can actually spell their job title.
    2013 Knolly Endorphin | 2013 Knolly Chilcotin | 2014 Knolly Podium.
    "think hedgehog not starfish" - delirian

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