The best balance of low frontal drag and crosswind stability the 45mm deep 25mm wide rim profile with integrated tyre design offers exceptional aerodynamics and control in any direction of wind perfect efficiency and low weight the 17c inner width and 12k carbon flanges create a wheel with low rolling resistance and high stiffness smartly adapted to the constraints of disc brakes both front and rear hubs are convertible to quick release with optional adapters the rear wheel is also sram xd c