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 Trek again expanded its worldwide headquarters in Waterloo, adding another to house its burgeoning engineering, R&D, and marketing departments. As part of the expansion, Trek included an atrium exhibit to display a number of historically significant bikes from Trek's family of brands, including one of the first mountain bikes ever built by Gary Fisher, and seven bikes used by Lance during his historic Tour de France run (one from each year, 1999–2005). After years of behind-the-scenes support for the League of American Bicyclists and the Bikes Belong Coalition, Trek announced its 1 World 2 Wheels bicycle advocacy campaign at its