Pro race performance, all-weather confidenceFeatures: - CENTER LOCK- D2 rim- OPTBAL spoke system- Road E-THRU 12 mm- Ultra-light full carbon rimBENEFIT:- For the performance driven triathlete and road racer- Balanced low inertia & aerodynamics- Aerodynamic performance- Improved drive rigidity- Lightweight within rigid- Disc brake systemSpecifications: - Average weight: 678 g- Thru Axle(Length x Inner diameter): 100 x 12 mm- Axle_Fixing method: 12mm E-THRU- Bearing_Cone: CBN finish- Bearing_Cup: CBN finish- Brake Type: CENTER LOCK disc brake- Disc mount: 140mm Disc rotor compatible- Disc mount: Center lock- Front / Rear: Front- O.L.D. (mm): 100- 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): 60- Rim Rim joint: 28- Spokes Number: 24- Tire Recommended size: 23-28´´ - 28-28´´- Tire Type: Tubular- Wheel Size: 700C 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.