Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member
    Join Date
    Dec 2007
    Posts
    457
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Bottom Bracket Question

    My bottom bracket worked itself out about 4mm today on my ride towards the drive side of my bike. I screwed it back in but wonder what caused it to do so? It does not feel as if the bearings are going bad. I took the chain off and spun the crank while holding the seat tube and I felt no grinding or anything to indicate the bearings were going bad.

    However, I was doing intervals today and pushing hard and I may not be able to duplicate the stress I put on it by having it on the stand.

  2. #2
    Senior Member
    Join Date
    Apr 2008
    Location
    Chicago, IL
    My Bikes
    Vintage Miele
    Posts
    713
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Could it be that the lockring was not tight enough? Is there a lockring on your bb?

  3. #3
    Senior Member
    Join Date
    Dec 2007
    Posts
    457
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by krems81 View Post
    Could it be that the lockring was not tight enough? Is there a lockring on your bb?
    No lockring. It is a sealed BB.

  4. #4
    Senior Member
    Join Date
    Apr 2008
    Location
    Chicago, IL
    My Bikes
    Vintage Miele
    Posts
    713
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't understand why they make bbs without lockrings. I can't answer your question DK, but I can say that if you had a lockring this probably wouldn't be a problem for you. I'm not sure that its advancement to have newfangled cups that you can't lock down.

  5. #5
    Low car diet JiveTurkey's Avatar
    Join Date
    Aug 2007
    Location
    Corvallis, OR, USA
    My Bikes
    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
    Posts
    2,378
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    A lockring on the non-driveside/adjustable cup of a traditional BB is necessary because it is not cinched down, rather it must be screwed in just the right amount for the bearings. Bearing tightness in cartridge BBs are not adjustable by the cups, so there's no need for a lockring. Drive-side cups have no lockring--both traditional and cartridge.

  6. #6
    Low car diet JiveTurkey's Avatar
    Join Date
    Aug 2007
    Location
    Corvallis, OR, USA
    My Bikes
    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
    Posts
    2,378
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    OP: Just tighten it down. By the way, which side was it?

  7. #7
    Senior Member
    Join Date
    Dec 2007
    Posts
    457
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JiveTurkey View Post
    OP: Just tighten it down. By the way, which side was it?
    It came out on the drive side. I tightened it down but wonder when it will work loose again?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •