50 mm height full carbon rim Internal rim width: 21 mm Shared rim profile with R9200 DURA-ACE wheels Improved aerodynamics Brake type : CENTER LOCK disc brake Axle fixing method : 12 mm E-THRU O.L.D. (mm) : 142 Rear speeds : 11/12 Spokes Number : 24 Tire Recommended size : 25-622 - 32-622