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
Mountain bike full XC and All-Mountain bikes. Examples include the Giant Trance, the Trek Fuel EX series, and the Specialized Stumpjumper FSR, among many others. With less of an emphasis on weight, trail bikes are typically built to handle rougher terrain than dedicated XC bikes while having slacker head angles (68-69°) which provide greater stability while descending. Trail bikes are designed for approximately 60-70% uphill, and 30-40% downhill riding. Enduro/all-mountain (AM) bikes bridge the gap between cross-country and freeride bikes, such as the Trek Remedy and Specialized Enduro series, typically weighing between . These bikes tend to feature greater suspension travel, frequently