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  1. #1
    mtbr member
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    Help! I think I ruined my freinds crankarm!

    My girlfriends brother doesnt ride clipless pedals and has big downhill flats on his Kona Mokomoko. I was borrowing his bike while in limbo (selling my bike) and I think I may have ruined the right crank arm on his Race Face Prodigy Set. I was trying to put his pedals back on--tightening them with a crescent wrench (first mistake) and cranking on them hard without apparently making sure they were going in straight (second mistake) then I went out to test ride it and the pedal started gyro-wobbling and just came off (third mistake). When I put the bike back on the stand this is what I found:


    I'm guessing the threads on the right crank arm are shot unless someone with a shred of intelligence or creativity (clearly not me) can think of anything different. I really don't want to have to buy a whole new crankset. I'm not sure if you can just buy one arm or what. Someone throw me a freaking bone here??? TYIA

  2. #2
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Dec 1998
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    48,025
    That it to a shop and have them put a Helicoil in. Basically it replaces the damaged threads with a steel insert. Works great.
    mtbtires.com
    The trouble with common sense is it is no longer common

  3. #3
    mtbr member
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    Awesome, I'll go check it out tomorrow, thanks very much.

  4. #4
    Are you talking to me?
    Reputation: damion's Avatar
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    Jun 2003
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    3,884

    Shiggy is right.

    A Helicoil should do the trick. If not, a replacement is not a big deal.
    gfy

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