Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Senior Member EGreen's Avatar
    Join Date
    Sep 2005
    Location
    Brooklyn, NY. Made in France
    Posts
    1,137
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    When is a Bottom Bracket Done?

    What are the symptoms of a Bottom Bracket on the decline and in need of a replacement?

    Why I ask is because I have recurring crank creaking. The first time I went to a total of 3 mechanics. The first one whom I did not personally speak with (the set up is that the mechanics are in the basement and the sales guy reports) It was reported that he said that the BB needed to be replaced. I went to two other guys who said no. The last of which tightened everything, thoroughly cleaned an lubed my bike and I rode away with no crank noise and feeling like I was riding a new bike.

    A couple of hundred miles/2 weeks later, the crank creaking has reemerged. I am wondering if the first guy was correct and that the thorough lubing just masked the problem for awhile.

    That it was not lubed with 'Titanium grease' (the frame is Ti) could this be an issue?

    btw this is a Record BB (over a year old) and Record ultra torque carbon cranks (double) A lot of riding year round.

    Edit -The noise itself is a creaking on the right (drive train side) of the crank with every rotation- but only with pressure. It cannot be replicated on a stand.
    Last edited by EGreen; 09-02-08 at 04:50 AM.

  2. #2
    Senior Member Road Fan's Avatar
    Join Date
    Apr 2005
    Location
    Ann Arbor, MI
    My Bikes
    Terraferma 650b, Mondonico SL and ELOS, Masi Gran Criterium, Trek 610, Breezer Liberty, Georgena Terry Classic
    Posts
    11,000
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by EGreen View Post
    What are the symptoms of a Bottom Bracket on the decline and in need of a replacement?

    Why I ask is because I have recurring crank creaking. The first time I went to a total of 3 mechanics. The first one whom I did not personally speak with (the set up is that the mechanics are in the basement and the sales guy reports) It was reported that he said that the BB needed to be replaced. I went to two other guys who said no. The last of which tightened everything, thoroughly cleaned an lubed my bike and I rode away with no crank noise and feeling like I was riding a new bike.

    A couple of hundred miles/2 weeks later, the crank creaking has reemerged. I am wondering if the first guy was correct and that the thorough lubing just masked the problem for awhile.

    That it was not lubed with 'Titanium grease' (the frame is Ti) could this be an issue?

    btw this is a Record BB (over a year old) and Record ultra torque carbon cranks (double) A lot of riding year round.

    Edit -The noise itself is a creaking on the right (drive train side) of the crank with every rotation- but only with pressure. It cannot be replicated on a stand.
    On our bikes I've only had this sound when a cartridge BB is moving in the BB shell, i.e. not secured correctly. I fixed it by removing the crank and BB, cleaning everything, and reassembling. You could need the BB shell faced, or the threads could be in bad shape, or you don't have it at suitably tight torque, or the threads just need a threadlocker in place. I can't say anything about Ti grease or any special Ti issues. The right attachment is very tight, at least on old fashioned BBs.

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,295
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Assembling the bb cups with a lot of grease or a couple of layers of plumber's teflon tape on the threads and torquing them to spec should quiet everything down for good. The recommended torque is very high (35 N-m or 310 inch-pounds) so a normal wrench won't get there unless you really lay on it.

    If the bearings are really bad, there will be roughness and play you should be able to feel on the repair stand. If the bb is shot, Campy has a three year warranty on their components.

    There is nothing special about "Ti grease" or Ti-prep" (anti-seize). They are standard greases and anti-seize packaged in tiny containers at hugely inflated cost.

  4. #4
    Senior Member EGreen's Avatar
    Join Date
    Sep 2005
    Location
    Brooklyn, NY. Made in France
    Posts
    1,137
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    Assembling the bb cups with a lot of grease or a couple of layers of plumber's teflon tape on the threads and torquing them to spec should quiet everything down for good. The recommended torque is very high (35 N-m or 310 inch-pounds) so a normal wrench won't get there unless you really lay on it.

    If the bearings are really bad, there will be roughness and play you should be able to feel on the repair stand. If the bb is shot, Campy has a three year warranty on their components.

    There is nothing special about "Ti grease" or Ti-prep" (anti-seize). They are standard greases and anti-seize packaged in tiny containers at hugely inflated cost.
    Thanks for the well informed feedback (Both HR and RF)!

Posting Permissions

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