Patent ID: 7258638

Claim:
Sprocket of a chain transmission for a bicycle, intended to be coupled with a further sprocket with a smaller diameter in a group of sprockets integral in rotation, comprising a plurality of teeth which follow each other on the sprocket separated by spaces according to a direction of rotation of the sprocket, in which each tooth has a thickness, a width and a height and presents a lead side, a following side, a front side and a rear side, comprising at least one of: a front bevel on at least one tooth of first disengagement of said plurality of teeth, said front bevel extending between the front side and the lead side up to at most a base of the space in front of the tooth of first disengagement, no bevel portion being provided in a middle point of said space in front of the tooth of first disengagement; and a rear bevel on at least one tooth of last engagement of said plurality of teeth, said rear bevel extending between the rear side and the following side up to at most a base of the space behind the tooth of last engagement, no bevel portion being provided in a middle point of said space behind the tooth of last engagement; wherein all of the teeth are provided with both a front bevel and a rear bevel; and wherein the front bevel extends further than the rear bevel.