The Zipp Speed Weaponry Sub-9 Disc Tubular Rear Road Wheel’s highlights so far include a pair of Ironman 70.3 World Championships, a Tour yellow jersey, some of the fastest Iron-distance bike splits ever recorded. Zipp expected nothing less from the ultimate aerodynamic breakthrough. In the center of the aero ‘sweet spot’ – a wind angle of 12 to 18 degrees – the Zipp Sub-9 Aero Disc Wheel was the first wheel ever to produce forward lift, when paired with Zipp’s 21mm Tangente tire. To achieve this feat, Zipp added a toroidal bulge similar to their spoked rims around the edge of the disc to control airflow at the wheel’s leading and trailing edges. In addition to improving aero performance, the bulge’s vertical compliance keeps the Sub-9 glued to the road when cornering and yields a comfortable ride, hour after hour. This makes it the ideal choice for long-course triathletes to bounce out of T2 with fresh legs after a blistering bike split.
For decades, an obsession with aerodynamics has influenced everything from wheels to water bottles. But with the Sub-9 disc, Zipp moved from minimizing drag to maximizing propulsion.
- Weight: 998g
- Hub Used: 182 sub9 disc hub
- Aero Width: 28.46mm
- Tire Bed Width: 18.0mm
- Dimpled Surface: Yes
- Ceramic Bearing: After-market installation