Road Tubeless clincher rims Improved aerodynamics 60 mm height full carbon rim Internal rim width: 21 mm Compatible with 11 and 12-speed Designed for the highest speed environments and modern tire widths, the Ultegra C60 wheelset shares its all-carbon rim profile with DURA-ACE but employs a hub that is compatible with both 12 and 11-speed cassettes. For situations where aerodynamics is the priority, the new Ultegra R8170 C60 wheelset features an all-carbon, 21 mm internal, tubeless compatible rim and a super-fast cup and cone bearing hub.