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85 Trek 2000 Alum Concerns

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85 Trek 2000 Alum Concerns

Old 04-29-10, 03:04 PM
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rothenfield1
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85 Trek 2000 Alum Concerns

I may be looking at the original aluminum framed bike this evening potentially to buy. I've read that because the tubes are 'bonded' there may be issues with separation. How serious are these concerns, and what should I be looking for upon inspection?
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Old 04-29-10, 03:08 PM
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Ex Pres
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I've had several bonded frames with no issues, including currently my daughter's '88 Trek 2000. But I would look for cracked paint around all the lugs. I've never seen any on my frames, but I did check before buying.

I'm not aware of any specific issues w/Trek frames, but maybe someone else knows better.
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Old 04-29-10, 03:11 PM
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Bonded lug separation is one of the most over rated frame issues I've ever heard of.
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Old 04-29-10, 03:22 PM
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Glad to hear it. I guess I should have also asked what a fair price would be for one in fair shape. This would be near the over-blotted San Fran Bay area.
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Old 04-29-10, 09:26 PM
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Early Trek 2000 frames often showed paint cracks at the lug/tube interface. Initially we thought this was a bonding failure, but after warranty replacement of several dozen frames and subsequent analysis of the returned frames we determined that it was a result of flex at the joint causing the paint to crack, but the actual bond between the lug and tube remained structurally intact. Reformulation of the paint prevented this from occurring in later frames.

N.B.: After 20+ years I cannot confidently vouch for the absolute integrity of the bonded joint, but I have no reason to believe that it may be a problem.
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