Shimano Ultegra R8170 C36 Cl Disc Carbon Tubeless Road Rear Wheel

With a shallow-depth aero profile and lively acceleration, the ULTEGRA R8170 C36 wheelset is a climber´s delight that delivers performance every road rider will appreciate.With the speed and efficiency of tubeless tires, the everyday performance of a shallow, aero profile carbon rim, and the convenience of 11 and 12-speed compatibility, the new ULTEGRA R8170 C36 wheelset is an upgrade for any road bike.Features:- 36 mm height full carbon rim- Internal rim width: 21 mm- Shared rim profile with R9200 DURA-ACE wheelsSpecifications:- Average weight: 831- Spokes_Straight pull: Yes- Brake type: CENTER LOCK disc brake- Axle fixing method: 12 mm E-THRU- Internal grease sleeve: Yes- O.L.D. (mm): 142- Rear speeds: 11/12- Thru Axle (Length x Inner diameter , mm)_142 x 12: Yes- Compatible spoke protector: CP-WR81A- D2 rim: Yes- Disc mount_140 mm Disc brake rotor compatible: Yes- Disc mount_CENTER LOCK: Yes- Front/Rear: Rear- OPTBAL (2:1): Yes- Reflector_AS: CATEYE RR-550-WUW SW- Reflector_DIN: CATEYE RR-317-WUA SW- Reflector_JIS/CPSC: CATEYE RR-550-WUW SW- Rim_Height (mm): 36- Rim_Requires rim tape: Yes- Spokes_Bladed: Yes- Spokes_Butted: Yes- Spokes_Number: 24- Tire_Recommended size: 25-622 - 32-622- Tire_Type: Tubeless- Wheel Size: 622 x 21C- HG spline (ROAD 11-speed): Yes- Engagement type: Pawl ratchet- Rim_External width (mm): 28- Rim_Internal width (mm): 21- Spokes_Diameter (mm): 2.0-1.6-2.0- Specification: RTechnologies:Center Lock:- The CENTER LOCK system makes an easy rotor installation possible with spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency.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 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.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