The BUELL XB is a series of sportbikes produced by the American Buell Motorcycle Company. The series includes the XB9, XB12 and XB9SX models which were designed to provide an excellent power-to-weight ratio and a combination of both aggressive and traditional styling. The XB motorcycles feature an advanced suspension system, light weight alloy wheels, disc brakes and a powerful air-cooled engine. The XB series was in production from 2003 to 2010.