With a shallow-depth aero profile and lively acceleration, the ULTEGRA R8170 C36 wheelset is a climber's delight that delivers performance every road rider will appreciate. With the speed and efficiency of tubeless tires, the everyday performance of a shallow, aero profile carbon rim, and the convenience of 11 and 12-speed compatibility, the new ULTEGRA R8170 C36 wheelset is an upgrade for any road bike. -36 mm height full carbon rim -Internal rim width: 21 mm -Shared rim profile with R9200 DURA-ACE wheels -Improved aerodynamics