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 at the World Cup level." In 2014, the UCI unified the two classifications into a single classification in line with regulations for current track pursuit bikes. Following the change in the rules, German Jens Voigt became the first rider to attempt the hour record, on 18 September 2014 at the Velodrome Suisse, Grenchen, Switzerland on a Trek bicycle. He set a new record of 51.110 km, beating the previous record set by Sosenka by 1.410 km. For the year 2010, Trek teamed with multiple suppliers to provide eco-friendly products. This includes brand new bikes that are economically priced and are