Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Banned.
    Join Date
    Mar 2011
    Posts
    1,100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    creaking bottom bracket

    i've heard the expression used a lot but never experienced myself until now. or at least I think I'm experiencing it. my bike is making a noise that sounds like bedsprings when I stand up on the pedals and start to get after it. it's fairly embarassingly loud. fortunately, I just bought a new aerozine cermaic bottom bracket because i got it on closeout for $25. Before I go ahead and install, I just want to get a better idea if that is definately my problem. What exactly causes creaking? is it just bearings worn out or lube dried up?

    BTW we are talking about an ultegra 6600 series crank/bb

  2. #2
    Senior Member
    Join Date
    May 2004
    Location
    Wilmington, DE
    My Bikes
    2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
    Posts
    8,849
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Before replacing your bottom bracket with a new one, I'd remove the crank and check the bearings by hand. If they feel smooth, remove the cups, grease the threads, then torque to spec. Do the same with the crank arms, installing per Shimano's instructions. If the creak remains, there are a number of other causes for creaks in addition to bottom brackets. Visit http://www.sheldonbrown.com/creaks.html to learn more.

  3. #3
    Senior Member CACycling's Avatar
    Join Date
    Feb 2008
    Location
    Oxnard, CA
    My Bikes
    '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
    Posts
    4,445
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The Hollowtech II style cranksets need to have the spindles greased where they contact the bearing cups. If this wasn't done, or not enought grease used, it will lead to creaking. Noises can come from many places and still sound like they are from the BB. Only way to tell is tackle them one at a time till the creak is gone.

  4. #4
    Banned.
    Join Date
    Mar 2011
    Posts
    1,100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    can i get the crank arm off without taking out that little cap? i forgot that the tool i have doesn't have that on the other side. I know it has to do with bearing adjustment but I'm just wondering if I can get it off, check the greasing of everything and install new bb then go to lbs and adjust that cap if needed.

  5. #5
    Senior Member
    Join Date
    May 2004
    Location
    Wilmington, DE
    My Bikes
    2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
    Posts
    8,849
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    No, that cap preloads the bearings by threading into the spindle and pulling the non-drive side arm onto the spindle. That cap likely is not torqued all that tight so you may be able to use a big flat blade screw driver to unscrew it. Don't blame me if you damage it doing that though

  6. #6
    Banned.
    Join Date
    Mar 2011
    Posts
    1,100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by joejack951 View Post
    No, that cap preloads the bearings by threading into the spindle and pulling the non-drive side arm onto the spindle. That cap likely is not torqued all that tight so you may be able to use a big flat blade screw driver to unscrew it. Don't blame me if you damage it doing that though
    thats what i thought. I remember installing it and putting it in their finger tight and not really knowing what it was for. I'll swing by my bike shop and get the right tool for it.

  7. #7
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,255
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    the preload cap doesn't need to be really tight. finger tight is good enough.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  8. #8
    Banned.
    Join Date
    Mar 2011
    Posts
    1,100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm an idiot, it wasn't the bb. I bought new titanium skewers. something about how I closed the rear was making the bike creak. changed my bb for nothing! oh well. now I got some ceramic bearings in there. I bought the crank used so who knows how much life that bb had in it.

Posting Permissions

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