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  1. #1
    11 is one louder than 10
    Reputation: Green Giant's Avatar
    Join Date
    Dec 2003

    stripped left xtr 960 crank arm - anyone else?

    Last night having a great ride, 2nd off roader of the here here in Michigan.

    Left foot feels funny... left foot now removed from bike with pedal and left XTR960 crankarm attached.

    My left side splines stripped out. Bummer. My concern is that they were definitely installed properly, heck, I even used my torque wrench and checked bolts regularly.

    Those splines are awfully small. Now, I know I'm not the only clyde rolling on these bad boys.

    Anyone else?

    good news for me, purchased in 8/05, and from performance so I can send them in with my receipt and get an exchange, or a credit I suspect. (the bummer is that I just replaced the middle ring with a boone TI, and upgraded the BB) I threw out the old middle ring (doh) so I'd be out that ring if I send these back for an exchance, unless I find a used, 34 tooth xtr chainring)

    Just deciding if these small splines are always going to have this problem.
    "The thing is, Bob, it's not that I'm lazy, it's that I just don't care."

  2. #2
    mtbr member
    Reputation: ZX12's Avatar
    Join Date
    Feb 2007
    I had a similar occurance on a set of Dura-Ace cranks, which are basically the same design for road use.

    If the cap screw is not held captive by the clamping effect of the two pinch bolts, it will work its way out and allow the crank arm to slip off the splines regardless of how much torque is on the pinch bolts.

    I had followed Shimanos torque specs for the cap screw, but I found that I have better results by tightening it by feel rather than a specific torque value.

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