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  1. #1
    Mainlander
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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!

  2. #2
    slow as I ever was Ex Pres's Avatar
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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.
    72 special CNC ______ 72 Frejus (ala Legnano) _73 Holdsworth Record
    80 Ranson__________ 80 unknown French____ 83 Trek 600 (620 styled)
    85 Gianni Motta_____ 90 Miele Gara ________ 02 Casati Dardo #1
    02 Casati Dardo #2 __ 03 Casati Dardo ______ 08 BF IRO (fixed/SS)
    09 Dogma FPX magn_ 10 Vassago Fisticuff (IGH)

    For Sale: _________ 78 Raleigh Professional __ 82 Peugeot PXN10
    85 Trek 560_______ 88 Guerciotti GLX

  3. #3
    Mainlander
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    Quote Originally Posted by Bob Barker View Post
    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

  4. #4
    Internal gears FTW! zoodude's Avatar
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    Share the road!

  5. #5
    Mainlander
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    Thanks! - there is some useful information in there.

  6. #6
    Hills hurt.. Couches kill RacerOne's Avatar
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    Quote Originally Posted by vintapperen View Post
    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.

  7. #7
    Mainlander
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    Quote Originally Posted by RacerOne View Post
    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.

  8. #8
    Nobody mconlonx's Avatar
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    If you're unsure about doing the repair yourself, Calfee bikes says they repair CF.
    I know next to nothing. I am frequently wrong.

  9. #9
    Mainlander
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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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