WorldSBKs class leading category features production-based racing motorcycles. In comparison with standard road models, a World Superbike machine is allowed certain modifications: Engine management, exhaust system, suspension, brakes and a number of engine parts. The bike must weight a minimum of 168kg, with power ranging between 750cc and 1200cc, depending on the number of cylinders the engine contains. Since limited technical modifications were introduced for 2015, tuning bikes, is now subject to more limitations than in previous years.