Ice Technologies Freeza Cooling
The RT-CL900 uses Shimano’s Ice Technologies Freeza construction to improve heat dissipation during sustained braking. This is particularly useful on long descents, repeated braking efforts and high-speed road riding where heat build-up can cause brake fade, rotor noise or pad rub.
Three-Layer Rotor Structure
The rotor uses a stainless steel / aluminium / stainless steel sandwich construction. The stainless steel outer braking surfaces provide braking durability, while the aluminium core helps draw heat away from the braking track.
Heat Dissipation Paint
Shimano applies heat dissipation paint to the cooling fins to further support temperature control. Better heat management helps maintain a more consistent braking feel during demanding rides.
3D Aluminium Carrier
The optimised 3D-shaped aluminium carrier is designed for low weight, stiffness and heat distortion resistance. This helps reduce rotor deformation and improves braking consistency under heavy loads.
Updated Arm Shape
The revised rotor arm profile improves rigidity and helps reduce vibration. This contributes to quieter braking, smoother modulation and reduced rubbing noise compared with older rotor designs.
Centrelock Mounting System
Shimano’s Centrelock system uses a splined rotor interface and lockring for fast, secure installation. Compared with 6-bolt systems, Centrelock can simplify rotor fitting, removal and ongoing bike maintenance.
External Serration Lockring Advantage
The external serration lockring is especially practical for many modern thru-axle hubs because it uses a bottom bracket-style tool interface.
