Shimano Dura Ace R9170 C40 Disc Tubeless Road Rear Wheel

Pro-tour confidence and performance


FEATURE:

- OPTBAL spoke system
- Road E-THRU 12 mm
- Ultra-light full carbon rim
- CENTER LOCK

BENEFIT:

- Best all-round wheelset
- Balanced low inertia & aerodynamics
- Responsive acceleration
- Improved drive rigidity
- Lightweight within rigid
- Disc brake system


Specifications:

- Average weight 883 g
- xle_Fixing method 12 mm E-THRU
- Thru Axle Length x Inner Diameter 142 x 12 mm
- Axle_Thru Axle Length x Inner Diameter (mm)_142x12 Yes
- Bearing_Cone CBN finish
- Bearing_Cup CBN finish
- Bearing_Stainless ball Yes
- Brake Type CENTER LOCK disc brake
- Compatible Spoke protector CP-W1460
- Disc mount_140mm Disc rotor compatible Yes
- Disc mount_Center lock Yes
- Front / Rear Rear
- Internal grease sleeve Yes
- O.L.D. (mm) 142
- Rear speeds 10*/11
- Reflector_AS CATEYE RR-550-WUA SW
- Reflector_DIN CATEYE RR-317-WUA SW
- Reflector_JIS/CPSC CATEYE RR-550-WUW SW
- Rim_Height (mm) 37
- Rim_Requires rim tape Yes
- Rim_Width (mm) 24
- Seal_Freehub body Contact
- Seal_Hub Contact
- Spokes_Bladed Yes
- Spokes_Butted Yes
- Spokes_Number 24
- Tire_Recommended size 23-622 - 32-622
- Tire_Type Tubeless
- Wheel Size 622 x 17C


Technology:

D2 RIM:
- 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.

CUP & CONE BEARING:
- Angular contact bearings of the cup & cone type offer greater strength than sealed cartridge industrial bearings due their ability to displace lateral and vertical loads more effectively for super smooth rotation and longer durability. Angular contact bearings also allow easier maintenance, adjustability and serviceability.

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.

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