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
Wilderness Trail Bikes of Marin and to market the components that they were producing. In 1988, Patrick Seidler, began working with WTB. This new company focused on licensing technology developed by WTB to mainstream bicycle industry manufacturers. Examples of technology developed by WTB that were produced under license include designs for tires made by Specialized Bicycle Components, the Blackburn B-52 water bottle cage, geometry for the 1987 Trek Bicycle Corporation mountain bike line and the use of Greaseguard in the top-end Suntour XC Pro component group. In 2002, Cunningham and Potts ceased to be part of WTB, leaving Mark Slate as the sole