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  1. #1
    Junior Member
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    Scary noise when standing and accelerating.

    When I stand up to accelerate from a dead stop in a low (hard) gear I'll hear an awful clacking/cracking noise from below but with no way to determine where it's coming from exactly. I'm afraid something's going to break. Any ideas of what to check?

  2. #2
    Senior Member
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    if you have a full suspension bike then that sound might be caused by a worn suspension pivot bearing. or the sound could be coming from your bottom bracket.

  3. #3
    PBR Racing RIC0's Avatar
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    Sounds like BB needs lubed up, could also be chainring bolts or pedals.
    Santa Cruz Tall Boy
    Cannondale CAAD 8

  4. #4
    Senior Member rumrunn6's Avatar
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    BB disintegrated, get it serviced. someone has to look inside
    cycling is like baseball ~ it doesn't take much to make it interesting

  5. #5
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    Most likely the BB but I have also heard similar noises out of failing pedals.

  6. #6
    Senior Member mystolenbikes's Avatar
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    None of the above.
    it sounds like a rim flex same thing happened to me while I was trying couple of different rims so check your spokes and adjust them if necessary.

  7. #7
    Former Member
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    When I get this noise it's usually coming from my knees.

    Failing that, grease the spindle-axle interface on a hollowtechII crank, if you have one.

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