Single-speed bicycle on the situation, a messenger may prefer a mountain bike based single-speed, which can roll over many obstacles, or a fast and light road bike-based single-speed. In the United States market, bicycle companies such as Bianchi, Cannondale, Fuji Bike, KHS, Kona, Raleigh, Giant, Specialized, Swobo, Felt, Trek and Niner all have produced and marketed single speed bicycles. Because most full suspension frame designs either have a single pivot that is not concentric with the bottom bracket, or a linkage with a variable center of rotation, the distance between the bottom bracket and rear axle varies throughout the suspension's travel. This
Trek Bicycle Corporation Trek discontinued the Exercycle line, spinning off its fitness division into an independently-owned company, renamed Vision Fitness. In 1995, Trek introduced its full suspension Y bike, a departure from traditional bike design. The Y bike sold well, and won an "Outstanding Design and Engineering Award" from "Popular Mechanics" magazine. Also in 1995, Trek made a number of business moves in order to diversify its product offering and gain market share, acquiring Klein Bicycles, a Chehalis, WA, manufacturer of premium aluminum-framed bicycles, as well as Bontrager Cycles, a Santa Cruz, CA-based manufacturer of bicycle components and hand-built steel frames. Trek also