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 3-tube carbon composite model, the 2500. Thus began Trek's foray into carbon fiber. That same year, to keep up with rapidly growing sales, Trek added another of manufacturing space to its Waterloo headquarters. In 1988 Trek introduced "Trek Wear," marking the company's entry into the cycling apparel business. A year later Trek expanded into foreign markets, opening subsidiary offices in the UK and in Germany. That same year Trek introduced its Jazz brand of bicycles, a collection of entry-level and kids’ bikes designed by Trek but manufactured in Taiwan. Jazz bicycles were discontinued in 1993. 1989 was a pivotal year