Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-22-08, 10:16 PM   #1
Durward_Kirby
Senior Member
Thread Starter
 
Join Date: Dec 2007
Bikes:
Posts: 457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Durward_Kirby is offline   Reply With Quote
Old 05-22-08, 11:01 PM   #2
krems81
Senior Member
 
Join Date: Apr 2008
Location: Chicago, IL
Bikes: Vintage Miele
Posts: 714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Could it be that the lockring was not tight enough? Is there a lockring on your bb?
krems81 is offline   Reply With Quote
Old 05-22-08, 11:34 PM   #3
Durward_Kirby
Senior Member
Thread Starter
 
Join Date: Dec 2007
Bikes:
Posts: 457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Durward_Kirby is offline   Reply With Quote
Old 05-23-08, 12:10 AM   #4
krems81
Senior Member
 
Join Date: Apr 2008
Location: Chicago, IL
Bikes: Vintage Miele
Posts: 714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
krems81 is offline   Reply With Quote
Old 05-23-08, 01:23 AM   #5
JiveTurkey
Low car diet
 
JiveTurkey's Avatar
 
Join Date: Aug 2007
Location: Corvallis, OR, USA
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: 2,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
JiveTurkey is offline   Reply With Quote
Old 05-23-08, 01:24 AM   #6
JiveTurkey
Low car diet
 
JiveTurkey's Avatar
 
Join Date: Aug 2007
Location: Corvallis, OR, USA
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: 2,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
OP: Just tighten it down. By the way, which side was it?
JiveTurkey is offline   Reply With Quote
Old 05-23-08, 08:03 AM   #7
Durward_Kirby
Senior Member
Thread Starter
 
Join Date: Dec 2007
Bikes:
Posts: 457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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?
Durward_Kirby is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:26 AM.