Stability, Climbing, Descending.The development of this mountain wheelset took all into account. Confidence inspiring traction counts in all conditions and terrains. This is your go-to wheelset for all things mountain. Asymmetrical, 30mm Internal Dimension rims mated with California crafted White Industries CLD+ (Boost) hubs makes for un-compromised ride, uphill or down. Available in Center Lock (CLD) DISC BRAKE ONLY.