Experience superior braking performance with the Shimano Dura-Ace RT-CL900 Disc Brake Rotor with Lockring. Designed for both 140mm and 160mm sizes, this rotor ensures quiet and consistent braking control across various terrains.Enjoy reliable braking performance on long, steep descents thanks to exceptional heat dissipationThe robust arm shape guarantees quiet operation without compromising weight or heat managementHeat dissipation paint enhances overall performanceIncludes a lock ring with internal serration for secure installation.