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Shimano
Dura-Ace 9170 C40 Carbon Disc Brake Road Wheelset - Tubeless

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Why We Like The Dura-Ace 9170 C40 Carbon Disc Brake Road Wheelset

The depth of these full-carbon C40 wheels makes them an ideal choice for a rider who needs a lightweight and stiff wheelset for repeated sharp attacks on steep cols and bergs as well as nabbing a sprint in a small select group at the end of a 5-hour slugfest. Its depth offers increased lateral rigidity and gives it enough aero benefit to help that attack stick if that's 30k from the line or a late-race surprise inside the flame rouge. Shimano offers a deeper wheel at 60mm for even more aero benefit, but for most riders, we feel this wheelset, at 37mm deep, add enough of an aero benefit without losing stability in windy conditions.


Shimano engineers considered both frontal and crosswind forces when developing the rim's profile. Through prototype testing, both in the wind tunnel and on the road yielded a wide rim shape with a deep tire bed as the best performer across a wider range of conditions. This shape, known as D2, reduced drag better than previous versions and competitor's profiles at yaw angles ranging from 0 to 15-degrees. An added bonus of the rim's profile is its improved vertical compliance for increased control and comfort over rougher roads. Helping bolster the aero benefits, even more, Shimano uses bladed spokes and places the spoke nipples internally which makes truing the wheels a little more tricky, but given these wheels' track record on the WorldTour circuit, we don't see ourselves having to do that very often, if at all.


Details

  • A versatile wheelset that's tubeless and disc ready
  • D2 carbon rim profile improves aerodynamics across more yaw angles
  • Rim depth pairs aerodynamic speed and confident stability
  • OptBal spoke system better balances rear spoke tensions
  • Wider rim width is optimized for 23-32mm tires
  • Tubeless compatibility lets you lower tire pressure
  • Dura-Ace hubs with cup and cone bearings roll smooth and fast
  • Item #SHI00DK
Rim Material
carbon fiber
Wheel Size
700c
Rim Depth
37mm
Rim Width
[internal] 17mm, [external] 24mm
Brake Compatibility
centerlock disc
Hubs
Dura-Ace
Front Axle
12mm Thru-Axle
Rear Axle
12 x 142mm
Spokes
bladed, straight-pull
Spoke Count
[front and rear] 24
Claimed Weight
[front] 1lb 9.4oz (721g), [rear] 1lb 14.5oz (865g)
Manufacturer Warranty
3 years
Activity
road cycling

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