Superbike World Championship (also known as WorldSBK, SBK, World Superbike, WSB, or WSBK) is a silhouette-class road racing series based on heavily modified production motorcycles, also known as superbike racing. The championship was founded in 1988. The Superbike World Championship consists of a series of rounds held on permanent racing facilities. Each round has two full length races and, from 2019, an additional ten-lap sprint race known as the Superpole race. The results of all three races are combined to determine two annual World Championships, one for riders and one for manufacturers.