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 10°C
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