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Thread: Wobbly Crank

  1. #1
    Senior Member askrom's Avatar
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    Wobbly Crank

    I'm able to, using my hands alone, wobble my crank arm about 1/8" to the left and right. I can only guess what this means for my riding performance, but I imagine it explains why when I pedal really hard my chain scrapes my front derailleur no matter how I fine tune it (it's non-indexed).

    Does this mean that the bottom bracket isn't adjusted properly? Or, worse, that the BB is shot? My setup is about 12 years old.

  2. #2
    Senior Member slagjumper's Avatar
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    If both arms move it is the BB. If it has been that way for a while you probably need a new one. If only the gear side crank arm moves maybe all you have to do is tighten that side. Does the crank us a cotter pin or 14or15 mm center bolt? Avoid riding it untill you can get it fixed.

  3. #3
    Bike jocks ar still jocks Portlandonian's Avatar
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    If it's a standard sized bike I would just buy a new BB, they really aren't that expensive, or just new BB bearings.

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