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
Schwinn Bicycle Company with Schwinn-designed chrome-molybdenum alloy steel frames. Supplied by manufacturers in Asia, the new arrangement enabled Schwinn to reduce costs and stay competitive with Asian bicycle companies. In Taiwan, Schwinn was able to conclude a new production agreement with Giant Bicycles, transferring Schwinn's frame design and manufacturing expertise to Giant in the process. With this partnership, Schwinn increased their bicycle sales to 500,000 per year by 1985. Schwinn annual sales soon neared the million mark, and the company turned a profit in the late 1980s. However, after unsuccessfully attempting to purchase a minority share in Giant Bicycles, Edward Schwinn Jr. negotiated