・Improved lateral stiffness of +20% (front) for powerful runners and sprinters・100% carbon rim with 60mm height・Inner rim width: 21 mm・DIRECT ENGAGEMENT・Compatible only with road cassettes Shimano 12 speedsFeaturesAs with the entire family of DURA-ACE wheels, the new C60s were designed from scratch. Different from the C36 and C50, the C60 has a specific front hub design with a Shimano OPTBAL 2: 1 spoking to improve lateral stiffness. The C60s also benefit from stiffer spokes, with a diameter of 1.8 mm instead of 1.5 mm. Tested by our professional athletes, the extra lateral stiffness of the C60s gives you more stability when cornering and riding at higher speeds. Finally, the new wind tunnel tested high rims have a more stable rapide cross section, which is great for time trialists, triathletes and sprinters.