Shimano RT-CL900 L Disc Rotor 203MM Ice-tech Centerlock External Serration W/lockring

Shimano RT-CL900 Centrelock Disc Brake Rotor - 203mm
Serious descents demand control that won't waver-ride cooler, quieter, and more confidently with the RT-CL900.
Shimano's premium-level disc brake rotor delivers enhanced heat resistance and ultra-quiet operation without compromising weight or performance. At 203mm, it's built for riders tackling long, steep terrain where heat management is critical-whether you're pushing limits on endurance road rides or charging down alpine switchbacks.
The RT-CL900 features ICE TECHNOLOGIES FREEZA with a 3-layer sandwich design and a purposefully engineered 3D aluminium carrier. Combined with heat-dissipation paint and extended radiator fins, it dramatically reduces rotor temperature to maintain consistent braking and reduce fade and noise-mile after mile.
Shimano's Centre Lock system ensures fast, secure installation and improved braking efficiency through precise spline engagement.
Key Features:
- ICE TECHNOLOGIES FREEZA: advanced 3-layer rotor construction for exceptional heat dissipation
- Heat-dissipation paint reduces rotor temperature by an additional 10degreeC
- 3D-shaped aluminium carrier resists heat deformation and reduces rubbing noise
- Centre Lock mount system: quick, secure rotor installation with reduced maintenance time
- Lightweight design with improved rigidity for stable, powerful braking
- Extended radiator fins expose more surface area for increased cooling
- Quieter braking even during intense, high-heat conditions
Technical Specifications:
- Model: Shimano RT-CL900
- Rotor Size: 203 mm
- Mount: Centre Lock (internal serration)
- Rotor Construction: Stainless steel - Aluminium - Stainless steel sandwich design
- Carrier: Optimised 3D-shaped aluminium
- Pad Compatibility: Narrow pad lining shape
- Technologies:
- ICE TECHNOLOGIES
- ICE TECHNOLOGIES FREEZA
- Heat Dissipation Paint
- Average Weight: 169g (203 mm)
- Hub Compatibility: Centre Lock hubs with spline and lockring system
- Use Case: Road, gravel, endurance, MTB-ideal for long, steep descents or high-demand braking scenarios