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Old 01-14-10, 02:41 PM   #1
vintapperen
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Trek 5500 bottom bracket repair

I have a work colleague (not the original owner, so no warranty unfortunately) who has an early-ish Trek 5500 where the bottom bracket shell is becoming disbonded from the carbon frame (this would be the original type of bottom bracket shell, I think?). Now the question is - is there anything that would hinder us pressing out the aluminum BB shell so we can re-bond it? We have a full precision engineering workshop complete with precision engineer here at work and I have many years experience in the marine industry working with laminates and epoxy adhesives, so I think we can do the job, would just really appreciate some clarification on the BB construction. Also any other information that you think would be relevant would be great. Thanks!
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Old 01-14-10, 02:53 PM   #2
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Don't tell me you're the third one with this issue.
Two earlier threads in the Road forum have hashed this out.
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Old 01-14-10, 03:57 PM   #3
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Don't tell me you're the third one with this issue.
Two earlier threads in the Road forum have hashed this out.
Hi - could you post a link to these threads then. Thanks
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Old 01-15-10, 10:15 PM   #4
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http://www.bikeforums.net/showthread...ight=trek+5500

http://www.bikeforums.net/showthread...ight=trek+5500
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Old 01-15-10, 11:44 PM   #5
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Thanks! - there is some useful information in there.
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Old 01-16-10, 02:19 AM   #6
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Thanks! - there is some useful information in there.
How in the world did you sort through all that and find any useful information? You've got the patience of a saint.
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Old 01-16-10, 05:39 PM   #7
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How in the world did you sort through all that and find any useful information? You've got the patience of a saint.
There was a lot of noise in that last thread! - about 3 useful posts out of 800+

Not sure about having the patience of a saint, but the owner of the frame is a good guy and I would like to try and help him out. Will post an update when we have done a repair.
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Old 01-17-10, 10:34 AM   #8
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If you're unsure about doing the repair yourself, Calfee bikes says they repair CF.
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Old 07-08-10, 07:05 PM   #9
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Late update:

Actually it was a pretty easy repair.
1. The aluminium insert is is just a straightwalled cylinder and using a BB tool and a long spanner we made sure it was tuning freely (i.e. we broke the glue bond completely).
2. By gradually screwing out one of the BB cups and using a press we pressed out the insert.
3. Cleaned all the old epoxy from the mating surfaces.
4. Using a lathe put a straight knurl on the insert for better 'grip'
5. Reglued the insert using a high-strength two-pack epoxy

It has been in daily use for several months now
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