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 performance enhancing substances". The complaint includes examples of Trek threatening its ties with LeMond in 2001 and 2004 after he made public statements against doping, Michele Ferrari, and Lance Armstrong Trek responded in April 2008 by suing to sever business ties with LeMond. Trek's press release said that "LeMond's suit was characterized by Burke as containing false and irresponsible allegations ". Burke also said "for years, Greg LeMond has done and said things that have damaged the LeMond brand and the Trek brand as a whole". . . . "His actions are inconsistent with our values—values we believe in and