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
Bicycle industry road does at a macro level to increase transport, the bicycle supports at the micro level. The bicycle, in that sense, can be one of the best means to eradicate poverty in poor nations. World Bicycle Relief, which specializes in large-scale, comprehensive bicycle distribution programs to aid poverty relief and disaster recovery initiatives in developing countries around the world, includes among its sponsors such notable companies as Accell Group, Bicycle Technologies International, Giant Bicycles, GT Bicycles, Quality Bicycle Products, Shimano, SRAM Corporation, Specialized Bicycle Components, and Trek Bicycle Corporation. Notable publications about bicycles and cycling include: Bicycle industry The Bicycle