The Parcours Chrono wheelset is a deep section option, with the front and rear wheels designed specifically to take into account the different yaw angle (the angle at which the air impacts the wheel) at which the wind hits them - something we're seeing increasingly often in many of the best road bike wheels.
As a result, the front has a wider and more U-shaped profile (as the yaw angles are higher) and the rear wheel keeps a more traditional narrower V-shape. According to Parcours the result is that the wheels are more aerodynamic than similarly deep wheels, whilst also being more stable in the wind. This promises to be both faster and also reduce the onset of fatigue, as the upper body isn’t having to utilise so much energy to stabilise the wheels.
