Galfer Brakes Cubiq Rear Brake Rotors - Solid Mount DF681QNamed after the crystal steel molecules, the Cubiq brake rotor combines state of the art technology with modern design Rotor shape promotes uniform brake pad wear the same contact surface between the pad and disc every revolution generates regular wear Less unsprung weight (up to 40% lighter than standard round rotors) reduces gyroscopic effect and improves the manueverability of the motorcycle Increased perimeter surface design generates more cooling