Built for riders who demand uncompromising braking performance, the Shimano RT-CL900-M 180mm ICE TECHNOLOGIES FREEZA Disc Rotor delivers exceptional stopping power, superior heat management and quieter braking on the longest, steepest descents. As Shimano’s flagship DURA-ACE rotor, it’s trusted by road racers, gravel riders and XC mountain bikers looking for maximum braking consistency without unnecessary weight. 

The RT-CL900-M features Shimano’s proven ICE TECHNOLOGIES FREEZA construction, combining stainless steel outer layers with an aluminium core to rapidly dissipate heat. An updated rotor arm profile increases stiffness to minimise heat-induced rotor distortion, helping reduce brake rub and unwanted noise during prolonged braking. The addition of heat-dissipating paint further enhances cooling, ensuring reliable performance when it matters most. 

This 180mm (M) version includes an externally serrated aluminium Center Lock lockring, making it ideal for hubs with larger thru-axles while allowing quick installation using a Hollowtech II bottom bracket tool. Compatible with both resin and metal brake pads, it’s the perfect upgrade for riders seeking confident braking in all conditions. 

Why you’ll love it

• Premium Shimano DURA-ACE RT-CL900-M 180mm disc rotor
• ICE TECHNOLOGIES FREEZA construction for outstanding heat dissipation
• Heat-dissipating paint improves cooling on sustained descents
• Revised rotor arm design reduces vibration and brake noise
• Delivers powerful, consistent braking under heavy loads
• Stainless steel and aluminium sandwich construction balances strength and weight
• Compatible with resin and metal brake pads
• Center Lock mounting system for fast, precise installation
• Includes externally serrated aluminium lockring
• Ideal for road, gravel, XC and performance mountain bike applications