During braking the disc has to dissipate the kinetic energy of the motorcycle which is normally turned into heat by the friction between the pads and the disc itself.
Therefore, the latter is affected by a thermomechanic force (heat + force) that the disc naturally holds out without getting deformed. Every disc has its own inertia (i.e. the tendency of a body not to modify its motion status) which depends on the weight and the external diameter and affects the speed when shifting directions.
A new disc project must take all these points into consideration and the best performance is achieved when the disc is lighter and more resistant.
BREMBO RACING SUPERSPORT 5,5-mm discs are fully interchangeable with the original discs and they are designed to fit to the OE calipers as well as with BREMBO Racing. These are floating discs made up of a brake rotor in thermically-treated martensitic stainless steel (capable to stand any thermomechanic strain) and of an CNC alloy-aluminium bell. These two parts are connected to each other using 10 bushings. The combination of these discs with Brembo Z04 pads won the 2009 World SuperSport Championship title.