Shimano Ultegra R8170 C50 Wheelset 142x12 mm Center Lock

Balancing aerodynamics, weight, and affordability, the ULTEGRA R8170 C50 wheelset is sure to inspire action on your group ride with its all-new tubeless carbon rim and updated, 12 and 11-speed compatible hub.

50 mm height full carbon rim
Internal rim width: 21 mm
Spokes diameter (mm): 2,0-1,6-2,0
Type: ROAD
Diameter: 622C
Axle fixing method: 12 mm E-THRU
Brake type CENTER LOCK disc brake
Rear speeds: 12 / 11
O.L.D.: 100 mm / 142 mm
Material: Aluminum/ Carbon

Technologies
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.

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
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