Dimples mean speed.
Zipp continues its mission of building the fastest disc wheels on the planet with its Super-9 Tubular Disc Wheel. With the introduction of this wheel, Zipp's Super line continues, marking this latest innovation in disc wheel design as the manufacturer's fastest wheel to date. It balances aerodynamics, stiffness, light weight, and durability into the ultimate road and track-convertible package. After all, Zipp's first product in the late '80s was the disc wheel, jumping into the spotlight as a serious wheel that could cheat wind unlike anything the cycling world had seen before.
The Super-9 Disc tubular borrows from the perimeter shape that makes Zipp's Sub-9 so fast it is able to actually generate forward lift when paired with Zipp's Tangente tires. However, in place of the Sub-9's toroidal bulge, Zipp created the Super-9 flat from its widest point all the way to the hub. This streamlined shape results in a wheel that's as fast as the Sub-9, but stiffer than any other disc Zipp produces.
The Super-9 Disc Tubular still features the dimpling pattern that's found on the 900 and the Firecrest models, which effectively smooths air flow in order to minimize drag. Zipp calls this its Aerodynamic Boundary Layer Control (ABLC). Essentially, this is a treatment to the carbon fiber, where the surface is embossed with over 4900 golf ball-like dimples in five different sizes. As a result, along the curved rim section, the dimples work to create a slight turbulence directly above the rim surface. This creates an artificial boundary layer that forces the laminar boundary layer towards the forward part of the rim in order to become turbulent. This process enables airflow to remain attached over more of the rim for a longer period of time, providing a lower level of integrated drag. The drag that ABLC creates is called skin friction drag. And although it's greatly increased, pressure drag (which is ten times higher than skin friction) is accordingly decreased. So, you experience less drag at effective wind angles between 10 and 20 degrees.
The hub used features internals manufactured using a high-voltage wire EDM technology. This specialized manufacturing process, usually reserved for avionics and Formula One gearboxes, lets Zipp machine 50% harder materials at tolerances 20 times greater than standard machining and heat treating. The result is a sub-200g hub that can handle the torque of a four-cylinder car engine.
The Zipp Super-9 Tubular Disc Wheel weighs around 1,190 grams, and it's available in the color Black with White labels. It is available with Campagnolo and Shimano/SRAM 11-speed compatible freehubs, and it is also convertible to a track setup.
- Aerodynamic Boundary Layer Control
- Hub manufactured with high-voltage EDM technology
- Available with Campagnolo and Shimano/SRAM 11-speed compatible freehubs