The early 90’s was when frame builders started seriously using carbon fiber for its aerodynamic advantages. Some of the wacky 90’s aero bikes include the Lotus 108 and Lotus 110 (another looker), the Zipp 2001 and 3001 (the update to the 2001, with added boron fibers to increase stiffness), the Trek Y-Foil 77 (kind of ugly I think), and the Giant MCR
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