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
Specialized Bicycle Components models. An original Stumpjumper is displayed in the Smithsonian Institution in Washington, D.C. In 1989, Specialized introduced the Epic, the world's second mass-production carbon fibre mountain bike. In the early 1990s, Specialized introduced the Globe line of urban bikes. The line was the subject of a major relaunch in 2009, which saw Globe become its own distinct brand. The Globe brand has since been discontinued, and Specialized now markets "lifestyle" bikes under its main brand. In 1995, Specialized launched the Full Force brand. Full Force was a lower-end mountain bike brand sold through sports stores and discount retailers such as