Shimano Dura-Ace WH-R9270 C60 Disc Carbon Clincher 700c Rear Wheel

WH-R9270 TL carbon clincher disc brake designed to meet pro road race criteria.

Perfect for flatter courses and time trials, the Dura-Ace C60 prioritizes aerodynamic efficiency and lateral rigidity. The new hub design, stiffer spokes, and deep section rim are designed specifically to allow you to push harder in corners and ensure that every bit of your effort is translated into forward motion.

Like the entire Dura-Ace wheel family, the new C60 started with a blank slate. Different from the C36 and C50, the C60 has a specific front hub design using Shimano's OPTBAL 2:1 spoke pattern to enhance lateral rigidity. The C60 also receives stiffer spokes, 1.8mm instead of 1.5mm. Tested by Shimano's professional athletes, this focus on the lateral rigidity of C60 allows you to push harder in corners and when maneuvering at higher speeds. Lastly the new wind-tunnel tested, deep section rims feature a faster, more stable cross-section that time trialists, triathletes, and sprinters alike will enjoy.

C60-HR - For high speed and powerful riders

A model that focuses on high-speed riding required for situations such as sprints and positioning for a sprint, as well as flat high-speed stages. As a result of pursuing aerodynamics, Shimano have succeeded in greatly reducing air resistance.

Meanwhile, it was found by tests conducted with a professional team that many riders who are good at sprints or on flat tracks output relatively high power and require higher rigidity. To withstand such high power and dynamic body movement and effectively transfer the power to driving force, this model has been specifically designed with high rigidity, incorporating Specification different from those of the other two models. C60-HR is the fastest wheel in Shimano’s history, recommended for speedsters and powerful riders.

Technology

D2

Aerodynamic performance is affected by wind direction. To create the D2 rim, Shimano engineers considered both frontal and cross winds, aiming to achieve optimal performance in real-world riding conditions. Extensive prototype testing, in the wind-tunnel and on the road, proved that a wide rim shape with a deep tire bed performs best across a wide range of conditions. At yaw angles ranging from 0 to 15 degrees, the Shimano D2 rim profile reduces air drag better than others aero shape rims. This rim design also boosts lateral wheel stiffness and offers improved vertical compliance for increased control, comfort and durability on the road.

Compared to the conventional product C40-TL, air resistance has been reduced at all yaw angles on C36-TL, which has about the same rim height. In the conversion method that considers the direction of the winds received under actual running conditions, the drag has been reduced by about 3 W. Of course, air resistance has been further reduced on both C50-TL and C60-HR-TL.

OPTBAL

The OPTBAL rear wheel spoke system features 21 spokes—14 on the drive side and 7 on the non-drive side. Cassette spacing in today’s wheels produces unbalanced tension in traditional 1:1 spoke systems. This unbalance is intensified with the 11-speed cassette, producing nearly double the tension on the drive side spokes. Generally high and low tension spokes have respectively tendency toward breaking down and coming loose spoke nipples. Unbalanced tension affects durability and strength. The OPTBAL design rebalances spoke tension, enhancing wheel rigidity and strength for a more durable wheel.

Science of Speed

Wheel performance is determined by three factors: aerodynamics, rigidity, and weight.

The new Shimano Road wheel collection optimizes the balance of those characteristics based on specific applications like climbing, all-round performance, or high-speed scenarios. Wheels unlike any other.

Decomposition of acceleration performance

To develop a wheel that advances crisply, responding to the rider’s pedalling force, that is, a wheel with excellent acceleration performance, Shimano made efforts to achieve two elements: improvement of drive rigidity and reduction of energy required for acceleration.

Drive rigidity

Shimano succeeded in dramatically increasing the drive rigidity compared to that of a conventional model.

Compared to the conventional product C40-TL, the drive rigidity has improved by 63% on C36-TL, by 69% on C50-TL, and surprisingly by 89% on C60-HR-TL (high-rigidity specification).

Decrease of energy required for acceleration

Compared to the conventional product C40-TL, the energy required for acceleration has been reduced by 12% on C36-TL, by 10% on C50-TL, and by 6% on C60-HR-TL.

Centre Lock

The Centre Lock system makes an easy rotor installation possible with spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency.

E-Thru

The tool-less type thru-axle skewer system optimizes rigidity and weight balance and enables easy operation with a reliable internal cam mechanism. The 15mm thru-axle system is 15% stiffer torsionally and 25% stiffer in transverse shear than a traditional 9mm quick release front axle system. High rigidity is secured while keeping the optimum weight balance. The E-Thru axle hub system minimizes the distortion of suspension while maintaining lightweight for riding around sharp corners at high speed.

Features

• Lightweight tubular full carbon 60mm deep rim for improved aerodynamics, increased rigidity and excellent inertia for sprinters and TT specialists
• Easy to use Center Lock rotor mount for use with disc brakes
• Stainless steel butted (2.0-1.8-2.0) and bladed straight pull spokes for optimal balance and rigidity
• Elbow-less spokes make for a strong yet compliant wheel
• High lateral rigidity is produced with a wide flange spacing
• Labyrinth double-contact sealing effectively shuts out water and dirt
• Alloy cone with integrated steel Borozon treated bearing races - super mirror finish reduces friction
• Cold forged, machined aluminium hub shell and oversized 7075 alloy axle keep the wheel weight to a minimum
• For 142 x 12mm axle
• 700c tubeless clincher compatible