Zipp’s go-to triathlon and time trial weapon, the Super-9 Disc rear wheel gives you the technology needed to do your best. Pro-proven, the design optimizes supreme aerodynamics, power transfer, stiffness, lightweight and durability. The Super-9 remains flat from its widest point all the way to the hub. This relatively simple-looking shape results in a wheel that’s fast and stiff. Aero, durable, light weight. Zipp graphics and cosmetic identity that screams speed. 18mm internal width and tubeless compatibility for optimization of wider tires with lower tire pressure, lower rolling resistance, and increase grip and compliance. Greater stopping power and modulation of disc brakes. Center locking rotor interface. Lockring is included.