Originally Posted by
frantik
Trek sold some Carbon Composite frames in the early 90s with three main tubes of carbon and the rear stays were aluminum. Talking with a friend, he said the tubes were actually carbon wrapped aluminum and not only carbon. I looked in the catalogs and they just say "carbon composite". Anyone have the skinny? I'm specifically interested in the MTB frames though I imagine the road and MTB frames are the same kind of construction
My curiosity piqued by your post, moments ago pulled the seatpost of my '95 Trek 2120, which has the three CF main tubes, and the seat tube appears to be CF through and through. There was a coating of aluminum dust 3 or 4 cm below the aluminum "lug" extending down the seat tube towards the BB, but that wiped away revealing nothing but CF. It is absolutely not "aluminum wrapped CF", and does not appear to be CF wrapped over aluminum. Hope this is helpful.