Designed for peak braking performance, the Shimano RT-CL900 CenterLock Rotor delivers exceptional braking control with reduced noise and heat buildup. Its two-piece construction combines a lightweight aluminum carrier with a stainless steel braking surface, ensuring excellent heat dissipation and consistent stopping power even on long descents. The refined arm profile minimizes resonance and vibration, significantly cutting rotor noise. With Shimano’s CenterLock mounting system, installation is quick and secure. Available in multiple sizes to suit your setup, the RT-CL900 is built for riders who demand the highest level of performance and reliability. Features: Two-piece construction for optimal heat management and weight savings The aluminum spider reduces heat deformation Updated design reduces braking noise and improves modulation Center Lock interface for easy installation and secure fit Compatible with resin and metallic pads Available in 140mm, 160mm, 180mm, and 203mm diameters Specs: Series: Dura-Ace / XTR Model ID: RT-CL900 Mount: Center lock Sizes: 140mm, 160mm, 180mm, 203mm Weight: 97g (140mm), 114g (160mm), 139g (180mm), 169g (203mm) Included Lockring: Internally notched (140mm, 160mm), Externally notched (180mm, 203mm) Compatibility: Compatible with both metal and resin Shimano brake pads