Like the entire DURA-ACE wheel family, the new C60 started with a blank slate. Different from the C36 and C50, the C60 has a specific front hub design using Shimano´s OPTBAL 2:1 spoke pattern to enhance lateral rigidity. The C60 also receives stiffer spokes, 1.8 mm instead of 1.5 mm. Tested by our professional athletes, this focus on the lateral rigidity of C60 allows you to push harder in corners and when maneuvering at higher speeds. Lastly the new wind-tunnel tested, deep section rims feature a faster, more stable cross-section that time trialists, triathletes, and sprinters alike will enjoy. Features:- HR: High-Rigidity ver. +20% increased lateral rigidity for powerful riders and sprinters- 60 mm height full carbon rim- Internal rim width: 21 mm- DIRECT ENGAGEMENT- Compatible only with Shimano road 12-speed cassette sprocketsSpecifications:Front/Rear: Front- Tire Type: Tubeless- Spokes Number: 24- Rim Requires rim tape: Yes- Tire Recommended size: 25-622 - 32-622- Tire Type: Tubeless- Rim Height (mm): 60- Rim Material: Carbon- Wheel Size: 622 x 21C (700C)- Brake Type: Center Lock disc brakeFront/Rear: Rear- Tire Type: Tubeless- Spokes Number: 24- Rim Requires rim tape: Yes- Tire Recommended size: 25-622 - 32-622- Tire Type: Tubeless- Rim Height (mm): 60- Rim Material: Carbon- Wheel Size: 622 x 21C (700C)- Brake Type: Center Lock disc brake