With the Zipp Super-9 Tubeless Disc Wheel for disc brakes on modern triathlon and time trial bikes, you can go faster. As one of the lightest wheels on the market, the Super-9 is an excellent choice for your modern triathlon and time trial bike. Its sophisticated shape starts wide and parallel from the hub, tapering inward as it meets the hookless tire bed. Thanks to Zipp's Total System Efficiency (TSE) carbon laminate and design, the Super-9 is engineered for a new era of wider tires and low tire pressure in time trials and triathlons. Zipp's TSE approach to wheel development is based on a simple premise: efficiency equals speed, whether the road surface is perfect or not. The combination of Zipp's wheel laminate with a wider rim profile optimized for the transition between tire and rim edge helps overcome the four obstacles to speed: aerodynamic drag, gravity, rolling resistance, and vibration losses. Inspired by TSE, Zipp has refined the Super-9 from the rim-to-tire transition to the ceramic bearings. The result is less effort required from riders. For triathletes, this means more energy for running. The Super-9 pairs perfectly with Zipp's current tubeless front wheels.