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

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

140
$84.99 AUD
Sale price  $84.99 AUD Regular price 
Skip to product information
Shimano Dura-Ace RT-CL900 Centrelock Disc Brake Rotor (External Serration)

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

$84.99 AUD
Sale price  $84.99 AUD Regular price 
Taxes included. Shipping calculated at checkout.

The Shimano Dura-Ace RT-CL900 External Serration Centrelock Disc Brake Rotor is a premium road and gravel disc rotor engineered for quieter braking, excellent heat management and consistent stopping power.

RT-CL900 Features

  • Premium Shimano Dura-Ace-level Centrelock disc rotor for road and gravel bikes
  • Ice Technologies Freeza construction helps reduce heat build-up and brake fade
  • External serration lockring design suited to many modern thru-axle disc wheelsets
  • Updated robust rotor arm shape reduces vibration, heat deformation and brake noise
  • Available in popular 140mm and 160mm road disc brake sizes
Rotor Size (mm)
Key Features & Technical Specifications

Technical Specifications

  • Product Name: Shimano Dura-Ace RT-CL900 External Serration Centrelock Disc Brake Rotor
  • Model: RT-CL900
  • Series: Shimano Dura-Ace / Shimano Centrelock Ice Technologies Freeza
  • Rotor Mount Type: Centrelock
  • Lockring Type: External serration
  • Brake Type: Disc brake
  • Common Road Sizes: 140mm and 160mm
  • Manufacturer Rotor Size Range: 140mm, 160mm, 180mm, 203mm
  • Average Weight:140mm: approximately 97g160mm: approximately 114g180mm: approximately 139g203mm: approximately 169g
  • Rotor Construction: Stainless steel / aluminium / stainless steel sandwich construction
  • Carrier: 3D-shaped aluminium carrier
  • Cooling Technology: Shimano Ice Technologies Freeza
  • Heat Management: Heat dissipation paint and exposed aluminium radiator fins
  • Pad Compatibility: Shimano narrow road pad lining shape; compatible with suitable Shimano resin or metal disc brake pads depending on caliper setup
  • Hub Compatibility: Centrelock-compatible hubs
  • Bike Compatibility: Road bikes, aero road bikes, endurance road bikes, gravel bikes and performance disc brake bikes
  • Recommended Use: Road racing, endurance cycling, gravel riding, Gran Fondo events, fast bunch rides, climbing routes and technical descents
  • Colour: Shimano Dura-Ace silver / black finish
  • Installation Tool: External Centrelock bottom bracket-style lockring tool
  • Included Items: Rotor and lockring depending on retailer packaging

Compatibility Notes

  • External serration lockrings are commonly used on modern thru-axle road and gravel wheelsets where external tool access is suitable.
  • Designed for Centrelock hubs only.
  • Not directly compatible with 6-bolt hubs unless using a suitable adaptor.
Notable Tech, Materials & Construction

Ice Technologies Freeza Cooling

The RT-CL900 uses Shimano’s Ice Technologies Freeza construction to improve heat dissipation during sustained braking. This is particularly useful on long descents, repeated braking efforts and high-speed road riding where heat build-up can cause brake fade, rotor noise or pad rub.

Three-Layer Rotor Structure

The rotor uses a stainless steel / aluminium / stainless steel sandwich construction. The stainless steel outer braking surfaces provide braking durability, while the aluminium core helps draw heat away from the braking track.

Heat Dissipation Paint

Shimano applies heat dissipation paint to the cooling fins to further support temperature control. Better heat management helps maintain a more consistent braking feel during demanding rides.

3D Aluminium Carrier

The optimised 3D-shaped aluminium carrier is designed for low weight, stiffness and heat distortion resistance. This helps reduce rotor deformation and improves braking consistency under heavy loads.

Updated Arm Shape

The revised rotor arm profile improves rigidity and helps reduce vibration. This contributes to quieter braking, smoother modulation and reduced rubbing noise compared with older rotor designs.

Centrelock Mounting System

Shimano’s Centrelock system uses a splined rotor interface and lockring for fast, secure installation. Compared with 6-bolt systems, Centrelock can simplify rotor fitting, removal and ongoing bike maintenance.

External Serration Lockring Advantage

The external serration lockring is especially practical for many modern thru-axle hubs because it uses a bottom bracket-style tool interface. 

Size, Fit, Geometry & Measurements

Available Rotor Sizes

140mm

  • Lightweight option for road race bikes
  • Common rear rotor size
  • Suitable for lighter riders, flatter terrain and riders prioritising low weight

160mm

  • Popular front rotor size for road and gravel bikes
  • Offers stronger braking power and better heat management than 140mm
  • Recommended for heavier riders, steep descents, endurance riding and mixed conditions
Who it is best suited for and How it performs in local conductions

Best Suited For

  • Road racers
  • Performance road cyclists
  • Endurance riders
  • Gravel riders
  • Shimano Dura-Ace, Ultegra and 105 hydraulic disc brake users
  • Riders upgrading from entry-level Shimano rotors
  • Cyclists replacing worn, noisy or heat-warped rotors
Industry Feedback, Rider Reviews and our own opinion

Gravel Cyclist, June 2022, highlighted Shimano’s focus on reducing heat deformation and brake noise with the RT-CL900 and RT-CL800 rotor platform, particularly through Ice Technologies Freeza cooling and improved carrier design.

Hands On Bike, April 2024, compared the RT-CL900 with earlier Shimano Dura-Ace and XTR rotors, noting the updated carrier design, improved cooling fin layout and focus on reducing heat-related rotor warping.

Overall professional feedback positions the RT-CL900 as a premium rotor for riders who want Shimano’s best balance of braking performance, heat control, low weight and quieter operation.

Product Care & Warranty Info

Gravel Cyclist, June 2022, highlighted Shimano’s focus on reducing heat deformation and brake noise with the RT-CL900 and RT-CL800 rotor platform, particularly through Ice Technologies Freeza cooling and improved carrier design.

Hands On Bike, April 2024, compared the RT-CL900 with earlier Shimano Dura-Ace and XTR rotors, noting the updated carrier design, improved cooling fin layout and focus on reducing heat-related rotor warping.

Overall professional feedback positions the RT-CL900 as a premium rotor for riders who want Shimano’s best balance of braking performance, heat control, low weight and quieter operation.