Built for quick accelerations with noticeable aero gains, the new Dura-Ace R9270 C36 wheelset offers great all-around performance without sacrificing head and crosswind stability. The all-new C36 design shaves mass at every opportunity but especially at the rim. The result is a wheel that gets up to speed quickly thanks to reduced rotational weight. Both the carbon rim and carbon hub are lighter than previous generations of Dura-Ace, so the C36 won't shy away from a day of climbing. The new rim is 36mm deep and still delivers good aerodynamic efficiency despite its gossamer weight. Meanwhile, the hub features an alloy freehub body and a new engagement mechanism for increased rigidity.