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 1993 Trek also acquired Gary Fisher Mountain Bikes, named after Gary Fisher, one of the inventors of the mountain bike and one of the most popular names in off-road cycling. Fisher had founded Gary Fisher Mountain Bikes in 1983 and sold his company in 1991 to Taiwan's Anlen company, remaining on as President. In 1992, Howie Cohen, who had previously imported Nishiki, Azuki and Kuwahara bicycles, assisted Gary Fisher with his brand — 18 months later brokering the acquisition of Fisher by Trek (in 1993). In 1994 Trek entered the growing home fitness arena, introducing Trek Fitness Exercycles. In 1996