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  1. #1
    mtbr member
    Join Date
    Jan 2011

    Shimano XTR drivetrain chain dump

    Recently bought a new hard tail and love the bike, went ahead and got the full XTR setup. 2x10. Occasionally when I hit a bumpy section my chain will dump off the large chainring in between my frame and small chainring. This poses a problem because when I ride rocky trail I dump my chain about every fifteen minutes. I'm not shifting when this happens, just hitting a rough section. Never pedaling either, it usually happens on a rough decent. I really want to race this bike, but if I'm dumping the chain every few minutes I'm out.

  2. #2
    mtbr member
    Reputation: bigdrunk's Avatar
    Join Date
    Feb 2004
    Too many links in the chain? Thats where my money is.

  3. #3
    mtbr member
    Reputation: limba's Avatar
    Join Date
    Jan 2004
    Yeah, maybe the chain is too long. Let's us know when you figure it out.

  4. #4
    bog is offline
    mtbr member
    Join Date
    Jun 2004
    Are you cross chaining when this is happening?
    What length cage are you running on the rear derailleur?
    Do you know if it is dropping off the top of the chainring or the bottom?

    Could be a few things but I'm with the other guys. Your chain is likely too long. Could also need some adjustment of the B-tension screw on the rear derailleur.
    Tallboy3c : Stigmata2 : Hightower LT

  5. #5
    mtbr member
    Reputation: DavidR1's Avatar
    Join Date
    Jul 2008
    Seems strange that it will dump from your large chain ring past your small ring to the frame?? Do you have the correct front derailleur installed? There is a specific front derailleur for a 2X setup.

    I have not had this issue with mine at all FWIW.

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