90's GT STS Carbon Fiber frame

those GT frames were made from comingled carbon and thermoplastic sock "tubing" , the machined alloy joints were placed in the machined mould with the sock pulled through them and a bladder inside the sock , once pressurized the heat ramped up and the plastic melted and "flows" and made the carbon rigid , quite tasty even though its a MTB !!
 
I have made carbon (epoxy) composite paddles here in Australia since 1990 and took a great interest in the method of manufacture used by GT (or likely a sub contractor)
 

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