The Shimano RT-CL800 disc brake rotor was developed with a focus on reducing heat deformation. The result is quiet braking performance without sacrificing weight or heat dissipation, giving riders consistent control on any terrain.Includes lock ring with external serrationConsistent braking performance on any long, steep descent thanks to excellent heat dissipationRobust arm shape for quiet operation without sacrificing weight or heat dissipationItem SpecificationsHub/Disc CompatibilityCenter-LockRotor Size (mm)180Rotor TypeTwo PieceWeight139 Shimano RT-CL800 Disc Brake Rotor Disc Rotor UPC: 192790309569