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 03-09-10, 11:55 PM   #1
scionsound5
Junior Member
Thread Starter
 
Join Date: Mar 2010
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bottom Bracket troubles. Please help!

Hi! New to the forum that I've been reading for years.
I have an old panasonic frame which i built up to my first fixed gear. I've been riding on it for about a year and i've only recently noticed that my bottom bracket keeps getting loose.
Both cups are tight, i've put sufficient torque on each. But after about a mile of riding my bb keeps loosening. The wiggle is horizontal and at the bottom bracket, NOT the crank arms. I've tried everything, including teflon tape. The frame threads don't seem to be ruined, but if anyone has had a similar problem or has some recommendations that'd be awesome. Thanks!!
scionsound5 is offline   Reply With Quote
Old 03-09-10, 11:58 PM   #2
PedallingATX
Comanche Racing
 
PedallingATX's Avatar
 
Join Date: Feb 2009
Location: Deep in the heart of Texas
Bikes: Presto NJS build, Specialized Allez Pro w/ full Dura Ace and Ksyrium SLs, 1990something Specialized Sirrus
Posts: 2,822
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
hmm...it's a loose bb or a cartridge? If it's a loose one it could have pitted or something. I would recommend buying a cartridge one. Shimano UN54 works alright and can be had for like $25
PedallingATX is offline   Reply With Quote
Old 03-10-10, 02:46 AM   #3
Yan 
BeaverTerror
 
Yan's Avatar
 
Join Date: Jan 2006
Location: Shanghai, China
Bikes: 1995 Kestrel 4000; 2013 True North Touring; 1989 Miele Tivoli; 1979 Colnago Sport
Posts: 1,945
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 157 Post(s)
Is the play between the cups and the frame, or between the axle and cups?
__________________
Yan
Yan is offline   Reply With Quote
Old 03-10-10, 03:03 AM   #4
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: velospace.org/viewcluster?c=873
Posts: 7,115
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
I'm assuming the former. The BB shell may have become ovalised...

So the cups can wiggle in the threads before you put the BB together?
Kimmo is offline   Reply With Quote
Old 03-10-10, 09:43 AM   #5
scionsound5
Junior Member
Thread Starter
 
Join Date: Mar 2010
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's a sealed cartridge bb, the play is between the cups and the frame, and right after i've installed it it locks up nice in the frame so i don't think its ovalised. I've just put in a new cartridge this morning so I'll keep you posted after my ride today. (just really hope i'm not out 30$) Thanks for the help!
scionsound5 is offline   Reply With Quote
Old 03-10-10, 10:08 AM   #6
Cynikal
Team Beer
 
Cynikal's Avatar
 
Join Date: Apr 2004
Location: Sacramento CA
Bikes: Too Many
Posts: 5,935
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
If you have the sealed BB with the plastic cups, make sure that it isn't cracked.
Cynikal is offline   Reply With Quote
Old 03-10-10, 01:48 PM   #7
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Kimmo View Post
I'm assuming the former. The BB shell may have become ovalised...

So the cups can wiggle in the threads before you put the BB together?
The bb shell can't be ovalised. There would be evidence of thread damage for that to happen. I doubt the OP is putting the required torque on the cups it's 30nm+ with grease on the drive side anyways.

Now let's get some useful information of the op:

1) Specific bottom bracket he's using
2) BB shell width
operator is offline   Reply With Quote
Old 03-10-10, 02:16 PM   #8
due ruote 
Senior Member
 
due ruote's Avatar
 
Join Date: Dec 2006
Bikes:
Posts: 5,508
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 69 Post(s)
Quote:
Originally Posted by operator View Post
The bb shell can't be ovalised. There would be evidence of thread damage for that to happen. I doubt the OP is putting the required torque on the cups it's 30nm+ with grease on the drive side anyways.

Now let's get some useful information of the op:

1) Specific bottom bracket he's using
2) BB shell width
+1
I'm wondering if the cartridge is (was) too narrow for the shell.
due ruote is offline   Reply With Quote
Old 03-15-10, 10:46 AM   #9
scionsound5
Junior Member
Thread Starter
 
Join Date: Mar 2010
Bikes:
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Okay, well a whole work week of mashing back of forth on a new bb and it seems to be holding up fine. Of course then again I teflon taped the ***** out of it. I'm thinking maybe the bottom bracket threads on the drive side were just worn somehow? Strange but thanks for all the help! Happy riding!
scionsound5 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 11:18 PM.