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
Specialized Bicycle Components ASI and the Canadian shop owner was resolved in December 2013, and Specialized vowed to be more cautious in its pursuit of trademark violators going forward. In 2014, Specialized forced bicycle builder Neil Pryde to change the name of their Alize bike model. Many riders in recent years have used Specialized bicycles in the North American and European professional cycling circuits. In 2016, the professional road teams sponsored by Specialized are Etixx–Quick-Step, Astana Pro Team, Tinkoff, Boels–Dolmans and Axeon–Hagens Berman. Mountain bike riders sponsored by Specialized include the downhill world champion Loïc Bruni, who rides for the Specialized Gravity Team,