Shimano Dura-Ace RT-CL900 Centrelock Disc Brake Rotor (Internal Serration)

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The Shimano Dura-Ace RT-CL900 Centrelock Disc Brake Rotor is a premium lightweight road and gravel rotor designed to deliver quieter braking, improved heat control and consistent stopping power.

RT-CL900 Features

Shimano Dura-Ace-level Centrelock rotor for premium road and gravel braking performance
Ice Technologies Freeza construction improves heat dissipation on long descents
Updated arm shape helps reduce rotor deformation, pad rub and brake noise
Heat dissipation paint improves cooling consistency under repeated braking
Available in multiple rotor sizes including 140mm and 160mm for modern road disc setups

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SKU: RT-CL900-140
Barcode: 192790232706

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Technical Specifications

Product Name: Shimano Dura-Ace RT-CL900 Centrelock Disc Brake Rotor
Model: RT-CL900
Series: Shimano Dura-Ace / Shimano Centrelock Ice Technologies Freeza
Brake Type: Hydraulic or mechanical disc brake compatible, depending on caliper setup
Rotor Mount: Centrelock
Lockring Style: Internal serration version, as listed
Rotor Sizes: 140mm, 160mm, 180mm, 203mm manufacturer range; commonly sold for road in 140mm and 160mm
Average Weight:140mm: approximately 97g160mm: approximately 114g180mm: approximately 139g203mm: approximately 169g
Technology: Ice Technologies, Ice Technologies Freeza, heat dissipation paint
Rotor Construction: Stainless steel / aluminium / stainless steel sandwich construction
Carrier Material: Aluminium 3D-shaped carrier
Pad Compatibility: Shimano narrow pad lining shape compatibility
Recommended Brake Pads: Shimano compatible resin or metal disc brake pads, depending on caliper and riding requirements
Compatible Bike Type: Road bikes, aero road bikes, endurance road bikes, gravel bikes and performance disc brake bikes
Recommended Use: Road racing, endurance riding, gravel riding, fast bunch rides, climbing routes and high-speed descending
Colour: Shimano Dura-Ace series silver / black finish
Installation Tool: Centrelock lockring tool required; tool type depends on internal or external serration lockring
Included Items: Rotor and lockring depending on retailer packaging

Compatibility Notes

Designed for Centrelock-compatible hubs only.
Not compatible with 6-bolt hubs unless using a suitable adaptor, which is generally not recommended for premium road builds.
Check fork and frame rotor size limits before upgrading from 140mm to 160mm or larger.
Internal serration lockrings are generally suited to standard quick release and many thru-axle hub setups, but compatibility should be checked against hub axle and tool clearance.

Ice Technologies Freeza Cooling

The RT-CL900 uses Shimano’s Ice Technologies Freeza design, which combines a three-layer rotor structure with exposed cooling fins. The stainless steel braking surfaces provide braking durability, while the aluminium core helps draw heat away from the braking track.

Heat Dissipation Paint

Shimano adds heat dissipation paint to improve cooling performance. This helps the rotor manage temperature during long descents, repeated braking and high-speed road riding.

3-Layer Sandwich Construction

The rotor uses a stainless steel / aluminium / stainless steel construction. This design is engineered to reduce heat build-up compared with standard stainless steel rotors, improving braking consistency and reducing fade.

3D Aluminium Carrier

The aluminium carrier is shaped to improve stiffness and heat distortion resistance. This helps the rotor maintain its shape under heavy braking, reducing the chance of rubbing, ticking or brake noise after long descents.

Updated Arm Shape

The RT-CL900 features a more robust arm profile compared with earlier Shimano road rotors. The aim is quieter operation, reduced vibration and improved resistance to heat-related rotor deformation.

Centrelock Mounting System

Shimano Centrelock makes rotor installation faster and cleaner than traditional 6-bolt systems. The spline interface improves alignment, while the lockring system allows secure and efficient installation.

Available Rotor Sizes

140mm

Best for lightweight road race bikes
Common rear rotor size
Lower weight option
Suitable for lighter riders and flatter riding conditions

160mm

Popular front rotor size for road and gravel bikes
Better heat management and braking power than 140mm
Strong choice for heavier riders, long descents and mixed terrain

For most Australian road riders:

140mm rear / 160mm front is a common balanced setup.
160mm front and rear is a strong option for heavier riders, steep descents, gravel riding or riders wanting more braking confidence.

The Shimano RT-CL900 is best suited to riders who want premium braking performance, quieter operation and better heat management from their disc brake road or gravel bike.

Best Suited For

Road racers
Performance road cyclists
Endurance riders
Gravel riders
Shimano Dura-Ace, Ultegra and 105 disc brake users
Riders replacing worn or noisy rotors
Cyclists upgrading from entry-level Shimano rotors
Riders who regularly descend, race or ride in fast groups

Gravel Cyclist, June 2022, covered Shimano’s RT-CL900 and RT-CL800 rotor release, highlighting Shimano’s focus on quieter, more consistent braking through reduced heat deformation, improved alloy carrier design and Ice Technologies Freeza construction.

Hands On Bike, April 2024, compared the Shimano RT-CL900 with earlier Dura-Ace RT900 and XTR MT900 rotors, noting the updated cleaner design, revised cooling fin layout and reshaped rear-side carrier structure aimed at reducing heat-related warping.

Industry commentary generally praises the RT-CL900 for:

Quieter braking under load
Better heat control than basic stainless rotors
Premium Shimano finish quality
Strong compatibility with Shimano road disc systems
Cleaner appearance than some earlier rotor designs
Better resistance to rubbing after heavy braking

Rider Feedback & Community Sentiment

Rider feedback is generally positive, particularly from cyclists upgrading from older Shimano rotors or lower-tier disc rotors.

Common positive comments include:

Noticeably quieter braking
Reduced rotor rub after long descents
Strong braking control with Shimano hydraulic calipers
Good modulation in wet and dry conditions
Premium appearance on high-end road bikes
Reliable performance for road and gravel use
Easy Centrelock installation

Many riders appreciate that the RT-CL900 improves one of the most common disc brake complaints: noise after heat build-up. The rotor is especially popular among riders who value quiet braking, clean aesthetics and Shimano drivetrain consistency.

Why We Love It at Pedal Passion

We love the Shimano RT-CL900 because it solves real-world problems riders actually notice: brake noise, heat fade, rotor rub and inconsistent braking feel.

Product Care

Clean rotors only with disc brake cleaner or isopropyl alcohol.
Avoid touching the braking surface with bare hands.
Keep chain lube, grease, polish and degreaser away from the rotor.
Bed in new rotors and pads properly before hard braking.
Inspect rotors regularly for wear, warping or contamination.
Replace rotors when they reach Shimano’s minimum thickness specification.
Use the correct Centrelock lockring tool.
Torque the lockring to Shimano’s recommended specification.
Replace contaminated brake pads rather than trying to recover them.
Check caliper alignment if brake rub or noise develops.
Do not pressure wash directly around hubs, rotors or brake calipers.

Warranty Information

Covered by Shimano manufacturer warranty against defects in materials and workmanship.
Normal wear, heat glazing, contamination, incorrect installation, crash damage and misuse are generally not covered.
Rotor lifespan depends on rider weight, braking style, terrain, pad compound, weather and maintenance habits.

Product SKU

140: RT-CL900-140
160: RT-CL900-160
180: RT-CL900-180
203: RT-CL900-203

Barcode (GTIN/EAN)

140: 192790232706
160: 192790232706
180:
203:

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