A motor-driven hub (1) for electrically driving an axle of a motor vehicle, said motor-driven hub including a hub (7) configured to receive a wheel (2), the hub (7) being rotatably mounted with respect to a hub carrier (5) about a hub axis (M), the motor-driven hub including an electric traction machine (3), the electric machine including an external stator (32) connected to the hub carrier and an internal rotor, the rotation of the rotor of the electric machine being permanently coupled to the rotation of the hub by means of reduction means (4), the reduction means (4) including a motor pinion gear (42) connected to the rotor of the electric machine and a crown gear (45) connected to the hub (7), the motor-driven hub also comprising mechanical disk braking means (12), wherein the reduction means include two stages of reduction and the brake disk is placed on the outside of the hub carrier with respect to the vehicle.