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  1. #1
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    washer inside crank bolt necessary? noob

    just put my cranks back on, seemed that the crank bolts sank a little deeper than originally. then noticed the (&*%^ washers on the kitchen sink. i am talking about a bontrager ISIS drive unit, hollow and spined.

    anyone familiar with that washer that goes inside the crank, right under the bolt? think it matters much? bike spins alright out on the street...

    muchas garcias-

  2. #2
    Poser
    Reputation: direktor's Avatar
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    Yes, it matter greatly.

    Get it back on as soon as you can....

  3. #3
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    mind adding a little supporting arguments? not that i dont believe, but would like to understand. tanks in advance, bk

  4. #4
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    The washer spreads the force of the bolt evenly and smoothly across the spline. The crank is aluminum so even though its strong, its soft when you thread a bolt against it.

    The reason why the bolt sank is because, well, there is no washer there and the spline was probably getting chewed up as you thread the bolt in.

    Take the bolt out and inspect the crank for damage. Hopefully, you didnt tighten it enough to do much damage to the arm. Make sure you put the washer back in.

  5. #5
    Loose Nut Behind d' Wheel
    Reputation: Lucky's Avatar
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    Quote Originally Posted by psychojylo
    The washer spreads the force of the bolt evenly and smoothly across the spline. The crank is aluminum so even though its strong, its soft when you thread a bolt against it.

    The reason why the bolt sank is because, well, there is no washer there and the spline was probably getting chewed up as you thread the bolt in.

    Take the bolt out and inspect the crank for damage. Hopefully, you didnt tighten it enough to do much damage to the arm. Make sure you put the washer back in.
    Not only that, but the washer keeps the crank arm from rubbing directly on the bolt head. Very small movements may cause it to loosen. I've read posts where folks are having problems with the crank bolt coming loose, only to find they lost the washer last time they had the crank off.

    Kathy
    Look where you want to go. This is as true in life as it is in mtbiking.

  6. #6
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    thanks peeps, mucho aprecio.

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