CNT Infused Carbon Fiber in Bicycles

Professional cycling is an area where every gram matters.  Many high-end manufacturers are beginning to go beyond simple carbon fiber bike frames and incorporating Carbon Nanotubes (CNT) into their carbon fiber resin.  Bike makers like Bianchi and BMC as well as component manufacturers like Easton are designing state of the art bicycles that are lighter and stronger than conventional carbon fiber by 20-30%[1].  Some of these CNT bike frames weigh as little as 860 grams—less than 2 pounds—with increased rigidity and fracture resistance[2].

This reduced weight, increased strength, and overall better performance does not come without a price.  The going rate for these top shelf frames is around $4,000-$5,000 with complete bikes costing upwards of $14,000 before any customization.  Additionally, these bikes have limited warranties.  Although CNTs are stronger than steel, the frames are relatively sensitive to chips, micro fractures and crushing at angles perpendicular to the fibers.

The manufacture of these bikes and components is state of the art, often involving huge carbon looms, advanced manufacturing robotics, and processes that rival those found in super car factories.  In the case of BMC bikes (as seen above), the frame structures are woven from 100 bobbins on a circular loom around a form.  The woven forms are then impregnated with CNT infused resin, with the CNTs filling the microscopic voids between the carbon fiber.  In the third stage, industrial robots perform precision cutting on the tubes, creating lengths that are appropriate for the frame being built.  Each manufacture uses different proprietary processes, but the general steps and structure are the same.

Source: http://nice.asu.edu/nano/cnt-infused-carbon-fiber-bicycles

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