(Jon of the Clue Crew holds a bicycle frame at Trek Bicycle Corporation in Waterloo, WI.)  Trek uses a proprietary method of optimum compaction & low void to maximize strength & minimize weight of frames & parts made of this element
In 1993 Trek introduced its first OCLV Carbon mountain bike frames, 
the... [DOC] [TLE] Pioneering Carbon Fiber Trek Bicycle | Wisconsin Historical Society [PAR] Sep 15, 2005 ... Engineering drawing of seat lug used in bonding aluminum and carbon frames, c
. ... bicycle, made by the Trek Bicycle Corporation, Waterloo, Wisconsin in 1988.