Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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Cracks are the biggest thing to look for, absolutely. Deep scratches on carbon fiber are also a concern, so if you ever drop the chain on the chainstay or anything like that, take an extra look at it. Another issue is that the CF sections may come unglued from the lugs that join them to the aluminum portions. Make sure there's no sign of warping or separation at the lugs.
Fortunately, CS and SS failures are not likely to cause serious crashes, as opposed to head tube, fork, or stem failure. So it's a good idea to check those portions too.
I have a 1990 aluminum frame which is joined with internal glued lugs... its total mileage is probably similar to yours (sat in someone's basement for a while), and it's doing great.