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  1. #1
    mtbr member
    Reputation: TheGenTwo's Avatar
    Join Date
    Oct 2009

    Someone Ease My Worries: Possible Crack On DeoreXT M770 Crank?

    Dear passers-by and Shimano tech

    I recently made a purchase of a secondhand XT m770 crankset(170mm length) from a notable figure in the local biking community .

    After the excitement of getting my hands on one faded once I reached home, a closer inspection on the cracks revealed a scar on the driveside crankarm, just above the pedal thread hole .

    To illustrate it , I have conjured a rough diagram and pictures exemplifying what I meant:

    Diagram(red line represents scar):

    Photo of "scar":

    The lighting made the scar look shiny

    I have also noted the cosmetic nature of the scar:

    1. Not jagged
    2. No "branches" i.e the alleged crack does not branch out into tiny cracks at each end
    3. Thin scar ( my nail cant seem to penetrate into the "abyss" of the crack "
    4. Rougly 11mm long

    Now I have no real idea on what I am going to do with the cranks...

  2. #2
    Reputation: SteveUK's Avatar
    Join Date
    Apr 2006
    Instead of conjuring a rough diagram, why not spend that time getting well-lit, properly focused pictures?

    What use is a philosopher who doesn't hurt anybody's feelings? -

  3. #3
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    It looks like a scratch. It's not any place that will fail catastrophically if it turns into a crack.
    I'm a member of NSMBA and IMBA Canada

  4. #4
    mtbr member
    Reputation: TheGenTwo's Avatar
    Join Date
    Oct 2009
    So it shouldnt be any area of concern, am I right?

    I have no proper camera to take the pictures, only relying on a poor handphone camera.

    Will try to post up new pictures.

  5. #5
    mtbr member
    Reputation: kiwi_matt's Avatar
    Join Date
    Jul 2008
    I wouldn't worry about that. I'd be stoked if that was the worst my cranks had seen.

  6. #6
    mtbr member
    Reputation: Tinshield's Avatar
    Join Date
    Jul 2007
    Looks like a scratch to me.
    JRA Cycles
    My Trek HiFi
    NEMBA Racing
    I love learning new things in my pajamas.

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