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Thread: movement in BB

  1. #1
    Senior Member BrokenGlass's Avatar
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    movement in BB

    today while cleaning off my bike and inspecting it all, i noticed there to be some play in the BB. when crank arms are parallel with the ground, they will move back and forth slightly. i just replaced the crankset and when i looked the BB i didnt notice any movement, and it seemed to be in good condition still. is there a chance that it could just be loose, or is it shot? its a square taper if that matters.
    thanks for any help.

    the picture is while looking down on the bike.
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  2. #2
    Senior Member DieselDan's Avatar
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    Time to replace the BB cartridge, or replace the BB bearings.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  3. #3
    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by BrokenGlass
    today while cleaning off my bike and inspecting it all, i noticed there to be some play in the BB. when crank arms are parallel with the ground, they will move back and forth slightly. i just replaced the crankset and when i looked the BB i didnt notice any movement, and it seemed to be in good condition still. is there a chance that it could just be loose, or is it shot? its a square taper if that matters.
    thanks for any help.

    the picture is while looking down on the bike.
    If it's a cartridge type you need to replace it. If it's a cup & cone type, it may just need to be properly adjusted. How old is this bike? It would help determine the BB type if you can post some close up pictures of the ends of the BB. If you determine it is a cup & cone type, here is the adjustment proceedure:

    http://www.parktool.com/repair/readhowto.asp?id=93
    "Work is the curse of the drinking class."
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  4. #4
    Senior Member BrokenGlass's Avatar
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    thanks for the replies. i think its a cup & cone type BB. heres a picture of the non-driveside of it from when i was replacing the crankset. i have more pictures than this one if youd like to see the drive side too. the bike is a 2003

    sorry about the delay in reply. professors decided to pile on the work.
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  5. #5
    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by BrokenGlass
    thanks for the replies. i think its a cup & cone type BB. heres a picture of the non-driveside of it from when i was replacing the crankset. i have more pictures than this one if youd like to see the drive side too. the bike is a 2003

    sorry about the delay in reply. professors decided to pile on the work.
    What I see in that picture looks like a typical cartridge type bottom bracket. The giveaway is that it clearly has a 20_spline ring which is typical of cartridges. Plus, most bikes new in 2003 would have cartridge BBs. You can get a new one for $15-20.
    "Work is the curse of the drinking class."
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  6. #6
    Senior Member BrokenGlass's Avatar
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    thanks for the help. is replace the cartridges easy? i'm still a novice in bike repair but want to be able to do most of it myself in the long term. i ride everyday (well, when i dont have too much school work). basically i dont want to screw anything up and then be out of a bike for weeks.

  7. #7
    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by BrokenGlass
    thanks for the help. is replace the cartridges easy? i'm still a novice in bike repair but want to be able to do most of it myself in the long term. i ride everyday (well, when i dont have too much school work). basically i dont want to screw anything up and then be out of a bike for weeks.
    See this page for full instructions on how to replace a cartridge style BB:

    http://www.parktool.com/repair/readhowto.asp?id=94
    "Work is the curse of the drinking class."
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