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 Armstrong during his historic Tour de France wins, including the original Trek Madone (2003)—named for the Col de la Madone, a 12K climb that starts in the French town of Menton and used by Armstrong to test his fitness—and TTX time trial bike (2005). That same year Trek opened its first European manufacturing facility, a frame and wheel assembly plant in Carlow, Ireland. The Carlow facility stayed open until late 2004, at which time Trek transferred its European production to a manufacturing facility in Hartmannsdorf, Germany. Responding to the unique needs of female cyclists, in 2000 Trek introduced Women's Specific