Mavic’s just introduced an all-new aerodynamic wheel/tire system called the CXR 80 that claims to have the lowest drag of any wheel setup in the world.
There are a few aero wheels that take tire shape into consideration, but Mavic goes a step further by incorporating the tire shape and design into the wheel, then fitting a plastic blade into a channel on the rim to seal the gap between tire and brake track.
The result is a near perfectly smooth surface that, combined with rim shaping, claims to provide superior aerodynamics in winds with up to an 18° yaw angle. Video above covers some of the development process, pics and more after the break…
The CXR was in development for three years. After developing the rim shape, they designed the sleeve to close the gap between tire’s edge and the tire. Lastly, even the tubular tire’s shape was dictated by aerodynamics, as was the tread. The front Yksion CXR tire’s tread pattern is shaped to manage the boundary layer of air (the air directly touching the tire and rim).
One of their design goals was to minimize surface turbulence to keep the air layers closest to the boundary layer laminar and close to the wheel/tire. Combined, the system claims to maintain laminar air flow from 0° to 18° of crosswind, which Mavic claims is the highest angle of any wheel. Beyond 18° you start to see some turbulence.
With more and more attention being paid to aerodynamics, Mavic will be making a big push with these wheels for triathlon in particular. Yes, they’ll be used by sponsored teams for time trials, too, but for the consumer market, 80mm is more in the realm of triathletes’ bikes.
Their wind tunnel testing shows they’re faster than their main competitors both alone on the bike and with a rider aboard. They’ve invited us out to test that in person in the wind tunnel in July, so look for a followup against some similarly deep wheels this summer.