Kestrel USA the launch of the first carbon fork and the debut of the KM40 Airfoil, the first true aero triathlon frame. Carbon framesets by better-known, mainstream manufacturers such as Giant and, most notably, Trek (with its OCLV frames), have been directly influenced by Kestrel design principles. Kestrel builds monocoque frames rather than more traditional tube and lug designs. This has always meant that Kestrels have tended to have a very fluid, curved appearance. However, more recent designs from the company have been more angular due to an increased desire to minimise wind resistance. Kestrel USA Kestrel is an American bicycle brand
Racing bicycle using a "main triangle" with three straight tubular shapes—the top tube, down tube, and seat tube. These three tubes, and other parts of the frame, need not be cylindrical, however, and many racing bicycles feature frames that use alternative shapes. Traditionally, the top tube of a racing bicycle is close to parallel with the ground when the bicycle is in its normal upright position. Some racing bicycles, however, have a top tube that slopes down towards the rear of the bicycle; the "compact" frame geometry was popularized by Giant. Frame manufacturers are free to use any material they choose in