Shimano Dura-Ace R9270 C60 Tubeless CL Disc Rear Wheel Designed specifically for Shimano 12-speed systems, the Dura-Ace R9270 C60 Tubeless CL Disc Rear Wheel is extremely aerodynamically efficient and laterally rigid. The 60mm deep D2 rim has been wind-tunnel developed and slices through the air with ease, making it ideal for time trials, triathlons and flatter criteriums, while the cross-section is more stable thanks to a re-design. The 28mm wide external rim maximises air volume within the tyre, creating excellent traction and low rolling resistance, and is optimised for wider tyres between 25mm and 32mm. Being tubeless-ready, you can benefit from smoother rolling and better puncture resistance. The 24 spokes are stiffer than others in the range, bringing more lateral rigidity, and they're laced to a premium aluminium hub that brings instant engagement for a highly efficient complete build.  Highlights Carbon clincher disc brake wheel designed to meet pro road race criteria Lightweight 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 (OPTBAL) OPTBAL design rebalances spoke tension, enhancing wheel rigidity and strength for a more durable wheel 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 Freehub uses direct engagement interlocking faces for quick power transfer Cold forged, machined aluminium hub shell and oversized 7075 alloy axle keep the wheel weight to a minimum 12-speed Shimano Road compatible only