OZ Racing 6-Spoke Cattiva RS-A Wheel Set BMW S1000RR 6 spokes, forged aluminium, black matt anodized, rear wheel anti slip coated, alpha Racing spec. Aluminum racing rims set in 6-spoke design, significantly better handling by reducing the unsprung mass. Same specification as used in alpha Racing's 2015 IDM team. Comes with sprocket carrier and rear brake disc adaptor for stock disc as well as bushings. Weight: 7.32 kg incl. valves, sprocket carrier with stud bolts and nuts, rear brake disc adaptor, bushes. vs. Wheel Weight: BMW HP4: 8.26 kg. compared to BMW OEM: 11.65 kg. Modification required: These wheels are only to be used with alpha Racing front brake discs. •FEM (finite element method) designed to minimize weight and increase strength and rigidity. •Reduced wheel weight decreases the moment of inertia which results in quicker acceleration and braking, lowers un-sprung weight and gyroscopic effect to provide quicker turn-in and more positive handling. •Specially treated billet aluminium alloy is bi-directionally forged, resulting in a more uniform and stronger metal structure. •Heat treating, shot peening and CNC finishing are done in house resulting in an extremely lightweight and rigid wheel. •Dot and JWL approved for street use. •OZ wheels are FIM homologated for racing and also used in World Super Bike, MotoGP 125, Moto2, British Super Bike, IDM German Superbike and Bol d'Or 24-hour endurance racing. •Included parts: bearings, valve stems, axle spacers (as applicable) and sprocket adaptor. •BMW specific front brake rotor carriers re-use OE or OE equivalent brake rotors. Includes: - front wheel 3.50" x 17" - rear wheel 6.00" x 17" - sprocket carrier - adaptor rear brake disc