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Were early 90s trek Carbon Composite frames "aluminum wrapped carbon" ?

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Were early 90s trek Carbon Composite frames "aluminum wrapped carbon" ?

Old 11-27-17, 10:50 PM
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frantik
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Were early 90s Trek Carbon Composite frames "carbon wrapped aluminum" ?

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

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Old 11-28-17, 12:50 AM
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Originally Posted by frantik View Post
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.
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Old 11-28-17, 01:19 AM
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Thanks, I have one here too but didn't think to pull the seat post. I suspected the tube were full carbon just based on how they sounded but wasn't sure after talking to my buddy.
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Old 11-28-17, 02:33 AM
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A few companies did use carbon-wrapped aluminum tubes for some of their bikes in the 1980s---Raleigh, for one. Not Trek, though.
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Old 11-28-17, 07:17 AM
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The Treks are not carbon-wrapped aluminum. A lot of seat posts were done this way. The Trek Composites were not, and once Aegis was done with their work for Trek, OCLV was it.

Some of these composite frames could be built incredibly light for the time. Like 17.1 lbs.
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