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 three women's triathlon series; the Trek Women Triathlon Series, the Danskin Series and the Iron Girl Series. As from the 2014 season, Trek became the main sponsor of Pro Tour cycling team Trek Factory Racing, a continuation of its bike sponsorship of Team RadioShack and co-sponsorship of Team Leopard-Trek. In 2017, Trek paid equal prize money to the male and female winners of the Cyclocross World Cup race hosted at their headquarters in Waterloo, Wisconsin, which was, "the first time in the history of the sport that women would be paid as much as men for racing the same course