Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5

Thread: BB question

  1. #1
    All around nice guy BRANDUNE's Avatar
    Join Date
    Apr 2007
    Location
    Sunny Seattle
    My Bikes
    THE KIND WITH TWO WHEELS AND ONE GEAR
    Posts
    1,742
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    BB question

    Hey guys,
    I recently built up my first aluminum frame, and I was feeling what I thought was flex in the BB. I could look down and see it moving, everyone just told me it was just frame flex. I took it all apart and regreased and retorqued everything just for my own sanity, now a couple days later I was looking closely and I can see the cups moving in the shell, I'm scared to take it apart, but I am assuming I have stripped my BB shell. My questions are A: how the hell did this happen? and B: is there any solution to this or is my frame now trash?

  2. #2
    Super Moderator
    Join Date
    Feb 2007
    Location
    Tariffville, CT
    My Bikes
    Tsunami Bikes
    Posts
    12,138
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    what kind of frame? do the BB cups press in or do they thread in?

    cdr
    "...during the Lance years, being fit became the No. 1 thing. Totally the only thing. It’s a big part of what we do, but fitness is not the only thing. There’s skills, there’s tactics … there’s all kinds of stuff..." Tim Johnson

  3. #3
    All around nice guy BRANDUNE's Avatar
    Join Date
    Apr 2007
    Location
    Sunny Seattle
    My Bikes
    THE KIND WITH TWO WHEELS AND ONE GEAR
    Posts
    1,742
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oh sorry, they are threaded, and the frame is generic, I believe it is what they rebrand as the DBR podium

  4. #4
    Senior Member tradtimbo's Avatar
    Join Date
    Aug 2007
    Location
    Monterey, California
    My Bikes
    1982 Fuji Team, 1979 Raleigh Team Record, 1984 Raleigh Team USA, Japanese Raleigh Super Course, 2000 LeMond Buenos Aires, 90's Schwinn High Plains, 1978? Austro Daimler Inter 10
    Posts
    547
    Mentioned
    0 Post(s)
    Tagged
    1 Thread(s)
    Aluminum is soft, and the threads easily deformed. Is there a chance you cross-threaded the BB on your initial installation, removed, and installed straight? did you properly adjust the bottom bracket before installing your cranks? Its not unheard of for a BB that is not adjusted properly to bind up. any evidence of that? Do you have the same thread types in the shell as on the cups? Is it possible that you used TOO much torque installing the BB? Aluminum threads can be stripped.

    I suggest you remove everything and check it all out. Your answer lies inside.
    Can anyone give me a ride from Monterey to Big Bear on Wednesday or Thursday?

    The Sustainable Cyclist

  5. #5
    Your mom
    Join Date
    Aug 2006
    Posts
    2,546
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've had BB flex in my Cannondale frame. Had to teflon tape the BB threads to compensate. Did you get the BB shell faced before install? This might solve it for you.

Posting Permissions

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