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Trek's KVF tube

Trek's Kammtail Virtual Foil (KVF) is an aerodynamic tube shape that maintains its full drag-reducing benefits at every yaw angle (the direction of the wind on your frame) by removing the trailing edge of the airfoil (compare the top and bottom profiles in the image above). The result? Lightweight, aerodynamic tubing that makes your bike faster in every situation, from headwinds to tailwinds and everything in between.