Shimano Ultegra RT-CL800

Silent Power.

Stop the rub and stay cool. The Shimano RT-CL800 represents the next generation of braking performance. Developed specifically to address heat deformation on long, technical descents, this Ultegra-level rotor is engineered for the rider who demands consistent, whisper-quiet stopping power; no matter how steep the road gets.

Why It’s a Major Upgrade:

• Quiet by Design: The new 3D-shaped aluminum carrier is significantly more robust than previous models. This increased rigidity prevents the rotor from deforming under extreme heat, virtually eliminating that annoying "ting-ting-ting" brake rub after a long descent.

• Ice-Tech Freeza Technology: Features Shimano’s legendary sandwich construction (Stainless Steel - Aluminum - Stainless Steel). The exposed aluminum radiator fins rapidly dissipate heat, lowering surface temperatures by up to 100°C compared to standard rotors.

• Consistent Bite: By managing heat more effectively, the RT-CL800 reduces brake fade. You get the same predictable lever feel and stopping power at the bottom of the hill as you did at the top.

• CenterLock Simplicity: The splined CenterLock mounting system ensures a perfectly centered installation and increased rigidity, while making rotor swaps a 30-second job.

• Pro Aesthetic: With its sleek, integrated cooling fins and black-finished carrier, it adds a high-tech "pro" look to any road or gravel build.

Technical Specs:

• Sizes Available: 140mm, 160mm, 180mm, 203mm

• Mounting: CenterLock

• Technology: Ice-Tech Freeza

• Compatibility: Resin or Metal pads (Narrow type)

• Weight: ~114g (160mm)

The Alegro Workshop Note: When we build up a FiftyOne Sika, these are our go-to rotors. They are the perfect match for Shimano 12Speed systems, providing the extra clearance needed for the newer, wider-spaced brake calipers.

Upgrade your braking. Experience the silence of the RT-CL800.