Bottom Bracket troubles. Please help!
03-09-10 | 11:55 PM
#1
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Joined: Mar 2010
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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!!
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!!
03-09-10 | 11:58 PM
#2
Comanche Racing
Joined: Feb 2009
Posts: 2,820
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From: Deep in the heart of Texas
Bikes: Presto NJS build, Specialized Allez Pro w/ full Dura Ace and Ksyrium SLs, 1990something Specialized Sirrus
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 $25
03-10-10 | 03:03 AM
#4
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Joined: Dec 2009
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From: Melbourne, Oz
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
I'm assuming the former. The BB shell may have become ovalised...
So the cups can wiggle in the threads before you put the BB together?
So the cups can wiggle in the threads before you put the BB together?
03-10-10 | 09:43 AM
#5
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It's a sealed cartridge bb, the play is between the cups and the frame, and right after i've installed it it locks up nice in the frame so i don't think its ovalised. I've just put in a new cartridge this morning so I'll keep you posted after my ride today. (just really hope i'm not out 30$) Thanks for the help!
03-10-10 | 10:08 AM
#6
Senior Member
Joined: Apr 2004
Posts: 6,357
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From: Sacramento CA
Bikes: Too Many
If you have the sealed BB with the plastic cups, make sure that it isn't cracked.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
03-10-10 | 01:48 PM
#7
cab horn
Joined: Jun 2004
Posts: 28,353
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From: Toronto
Bikes: 1987 Bianchi Campione
Now let's get some useful information of the op:
1) Specific bottom bracket he's using
2) BB shell width
03-10-10 | 02:16 PM
#8
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Joined: Dec 2006
Posts: 7,472
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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
Now let's get some useful information of the op:
1) Specific bottom bracket he's using
2) BB shell width
I'm wondering if the cartridge is (was) too narrow for the shell.
03-15-10 | 10:46 AM
#9
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Joined: Mar 2010
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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!
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