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Chili hed & old bike fixr
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1,126 Posts
tatum07 said:
Anyone have a problem with Shimano bottom brackets unscrewing from the frame such that the drive side crank arm is pulled out awayed from the frame? The non-drive crank arm is pulled towards the frame. I ride a Colnago CT-1 with Italian threaded BB. The frame is Ti, so luckily the bb was not stripped, according to my LBS (i have not picked up the bike yet).

I orginally had a dura ace bb installed, but replaced it with ultegra for durability reasons. I never experinced this problem when the dura ace was installed. So I'm wondering if it has to do with compatibilty issues with the ultegra product line.

BTW my LBS suggested that I consider replacing the group with Campy as Campy might be more compatable as it is Italian made. I find this hard to believe as many of the pro's ride dura ace on Italian frames including Colnago with no problems.

Any help is greatly appreciated.
This is a common occurance on Italian frames regardless of the name on the parts. Yiur Ultegra bb was not installed to the proper torque spec as listed in the Shimano literature and if the LBS did it, shame on them. With their comment on Shimano vs Campy it is obvious where the problem is.
 

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Chili hed & old bike fixr
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1,126 Posts
tatum07 said:
thanks. My lbs cautiously indicated that the problem was fixed. When I pick up the bike today I will ask him about propoer torque.
If they have any scruples at all, there will be no charge. If there is a charge, get them to explain why, especially now that you know the real cause of the problem.
 

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Chili hed & old bike fixr
Joined
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1,126 Posts
tatum07 said:
I don't have any concerns regarding my lbs' skills (yet). The shop is a pro shop which typically only deals with high-end bikes. The problem may be more a factor of which mechanic corrected the problem last time. I have my doubts about some of the mechanics.
The shop does nothing except give the mechanics a place to foul up customers's bikes. If you have doubts about the mechanics, you can have no faith in the shop. Please explain why this is not true.
 
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