Shimano wheelset DA WH-R9270-C50 12G 28" 12mm Tubless Disc Box Centerlock - 12x100 | 12x142 mm - HG L2

As an all-rounder in the new DURA-ACE wheel line-up, the C50 is lighter than its predecessor, the C40, and almost as aerodynamic as the previous C60. This wheel feels at home in a wide range of conditions. Whether time trials or criteriums, hilly terrain or attacking your own personal best time, the new C50 is the ideal wheel for ambitious road cyclists.

The brand new DURA-ACE C50 wheels impress with the optimum combination of low weight and aerodynamic performance, with the revised full carbon tubeless rims in particular offering high stiffness combined with reduced weight.

Shimano Dura Ace WH-R9270 wheelset
The wheels are a key pillar in Shimano's "Science of Speed" development concept, literally bringing the rider's performance to the road.

In order to meet this requirement, the engineers have paid attention to the optimum balance of three factors according to the different areas of use: Aerodynamics, stiffness and lower weight.

C50 rim profile - aerodynamic all-rounder
The reduction of aerodynamic drag is the key discipline of the Dura Ace WH-R9270-C50 wheelset. In addition, the low overall weight and the resulting low rotating mass in combination with outstanding lateral and drivetrain stiffness result in a balanced ratio of those values that significantly determine performance.

The 50 mm deep wheels owe their aerodynamic efficiency not least to the sophisticated D2 rim design. In combination with the low weight, which makes the set even lighter than the C40 predecessor model, the wheels feel at home almost anywhere, be it in time trials or criteriums, in hilly terrain or when chasing the best times.

The new generation of wheels not only shines with reduced air resistance, but also offers technical refinements. Thanks to Direct Engagement technology, the freewheel hubs offer outstanding drivetrain stiffness, which results in an even more direct feeling in power transmission and is particularly noticeable when starting off. The OPTBAL system with its 2:1 spoke ratio further improves the stiffness of the rear wheel.

D2 rim design
Aerodynamic performance is influenced by the direction of the wind. When developing the D2 rim profile, Shimano's engineers took both headwinds and crosswinds into account to ensure optimum performance in real-world riding conditions.

Extensive prototype testing in the wind tunnel and on the road has shown that a wide rim shape and deep rim well provide the best performance in a wide range of conditions. At angles of attack from 0 to 15 degrees, the D2 rim design reduces drag better than other aerodynamic rims. It also increases the lateral stiffness of the wheel and improves directional stability in the vertical direction, resulting in more control, comfort and durability on the road.

OPTBAL
Wheels with the OPTBAL system use a 2:1 spoke ratio, which results in twice as many spokes on the drive side as on the opposite side. The technology thus counteracts the unbalanced tension caused by increasing cassette widths, particularly on the right-hand side. The OPTBAL design compensates for this spoke tension and thus increases the service life of the spokes. This ultimately improves the stiffness of the entire wheel.

Only compatible with SHIMANO 12-speed road wheel cassettes
50 mm high full carbon rim
Rim width: 21 mm
All-round wheels made from lightweight materials with balanced aerodynamics

Technical details of the WH-R9270-C50-TL wheelset
Tire type: clincher/folding tire, tubeless
Cross section: symmetrical
Outer width: 28 mm / inner width: 21 mm
Tread height: 50 mm
Brake rotor mount: Centerlock
Freehub body: Shimano HG L2 (12-speed)
Freehub type: Direct Engagement
Bearings: Tapered roller bearings (Cup & Cone), contact seals
Installation dimension: 12 x 100 mm / 12 x 142 mm (thru axle)
Blade spokes (straight pull, butted)
Number of spokes: 24 (front + rear)
Spoke pattern front: double crossed
Rear spoke pattern: OPTBAL (left radial / right double crossed)

Material:

Rims: carbon fiber reinforced plastic (CFRP, painted)
Hubs, axles, quick release: aluminium (anodized)
Bearings: Stainless steel (CBN-coated)
Spokes: Stainless steel
Nipples: Aluminum

Compatibility:
Cassette: CS-R9200, CS-R8100