A toothed sprocket hub with at least two elastic centering elements, the hub comprising: an input shaft having a receiving portion and a cylindrical outer surface; a sprocket having a central bore engaged with the input shaft, the sprocket comprising inside the central bore: at least two first surfaces, each of the at least two first surfaces being disposed on a respective bending beam such that each of the at least two first surfaces is elastically moveable in a radial direction, the at least two first surfaces bearing upon the cylindrical outer surface, the at least two first surfaces each having a radius d that is less than a radius D of the cylindrical outer surface, each of the at least two bending beams with its respective first surface forming a respective one of the at least two elastic centering elements; at least one second surface that is radially moveable to a lesser extent than the at least two first surfaces, the at least one second surface engaging the receiving portion to prevent a relative rotation of the sprocket with the input shaft; characterised in that the sprocket further comprises inside the central bore: a third surface in cooperative relation to the at least one second surface, the third surface bearing upon the cylindrical outer surface of the input shaft, the third surface having a clearance fit with the cylindrical outer surface, wherein the at least one second surface is disposed between one of the at least two first surfaces and the third surface. an input shaft having a receiving portion and a cylindrical outer surface; a sprocket having a central bore engaged with the input shaft, the sprocket comprising inside the central bore: at least two first surfaces, each of the at least two first surfaces being disposed on a respective bending beam such that each of the at least two first surfaces is elastically moveable in a radial direction, the at least two first surfaces bearing upon the cylindrical outer surface, the at least two first surfaces each having a radius d that is less than a radius D of the cylindrical outer surface, each of the at least two bending beams with its respective first surface forming a respective one of the at least two elastic centering elements; at least one second surface that is radially moveable to a lesser extent than the at least two first surfaces, the at least one second surface engaging the receiving portion to prevent a relative rotation of the sprocket with the input shaft; characterised in that the sprocket further comprises inside the central bore: a third surface in cooperative relation to the at least one second surface, the third surface bearing upon the cylindrical outer surface of the input shaft, the third surface having a clearance fit with the cylindrical outer surface, wherein the at least one second surface is disposed between one of the at least two first surfaces and the third surface. at least two first surfaces, each of the at least two first surfaces being disposed on a respective bending beam such that each of the at least two first surfaces is elastically moveable in a radial direction, the at least two first surfaces bearing upon the cylindrical outer surface, the at least two first surfaces each having a radius d that is less than a radius D of the cylindrical outer surface, each of the at least two bending beams with its respective first surface forming a respective one of the at least two elastic centering elements; at least one second surface that is radially moveable to a lesser extent than the at least two first surfaces, the at least one second surface engaging the receiving portion to prevent a relative rotation of the sprocket with the input shaft; a third surface in cooperative relation to the at least one second surface, the third surface bearing upon the cylindrical outer surface of the input shaft, the third surface having a clearance fit with the cylindrical outer surface, wherein the at least one second surface is disposed between one of the at least two first surfaces and the third surface.