Definition of Hysterisis

Hysterisis can best be described as the energy lost, usually in the form of a build-up of heat, when a section of vulcanised rubber is deformed in a regular, constant manner.

The more you subject a tyre to flexing and deformation the more heat will build up within the tyre. As we know, excessive heat is the enemy of a tyre so this build-up has to be kept under control.