I have an older Trek 2100 that has carbon fiber tubes with aluminum stays (The frame is used early 90's 2100/2150/2200/2300 road bikes)
After a recent accident with a car (going down hill, guy pulls into the road from a driveway and just... stops, so I bounce off his door) I took my bike to a shop to check for frame cracks, which they didn't find thankfully.
They did point out though that in the lower frame joint (by the front derailleur) the carbon tubes are separating from the aluminum joint. This is apparently unrelated to the accident and something that naturally happens as the epoxy ages and the bike is regularly used.
How dangerous is this? How likely is it to catastrophically separate outside of an accident type situation (i.e. just riding around)? And is it possible to rebuild the frame with fresh epoxy (I have access to a machine shop and some industrial grade epoxy)?
I love downtube shifters too much to just toss it away :D