Sub-9 Disc Tubular - The Sub-9’s highlights so far include a pair of Ironman 70.3 World Championships, a Tour de France yellow jersey and some of the fastest Ironman-distance bike splits ever recorded. We 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 was the first wheel ever to produce forward lift, when paired with our 21 mm Tangente tire. To achieve this feat, we added a toroidal bulge similar to our 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 Transition 2 for the run 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, we moved from minimizing drag to maximizing propulsion.
The Super-9 has claimed multiple world time trial championships, Tour de France stages, Ironman-distance and 70.3-distance victories, not to mention the fastest Ironman®performance of all time.
Note: The Sub-9 may present some fitment issues for a small number of frames. The clearance between the chainstay and the rim may not be adequate to avoid contact between each other when ridden under load. We urge customers who plan on riding the Sub-9 to test the wheel within a frame under riding roads and conditions before purchasing. Clearance within individual frames of the same size, from the same manufacturer, may vary. Customers who run into this fitment issue may consider Zipp’s Super-9 or 900 discs as alternatives. Below is a list of known frames that may present this issue. This list will be updated if this fitment issue is discovered elsewhere.
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