Patent ID: 8454461

Claim:
Motion transmission system of a bicycle, comprising a plurality of sprockets in a sprocket assembly that mounts on a freewheel body of a hub of a bicycle rear wheel, and a bicycle chain that engages the sprockets of the sprocket assembly, the hub being able to rotate about a rotation axis and comprising a plurality of attachment seats for spokes of the rear wheel of the bicycle and a fastening portion to a frame of the bicycle, the sprocket assembly comprising at least eleven sprockets, wherein all of the sprockets of the sprocket assembly, when they are associated with the freewheel body, have an overall axial width that is lower than, or equal to, an axial distance defined on the hub between a first plane and a second plane, said first and second planes being substantially perpendicular to the rotation axis, said first plane including at least one point of the attachment seats for the spokes closest to the freewheel body, said second plane being defined in the fastening portion to the frame and including at least one point for the attachment to the frame closest to the freewheel body, such that the sprockets are bound between the first and second planes, and the chain has a maximum thickness in the direction of the rotation axis between and including 4.6 mm and 5.8 mm, wherein the distance in the direction of the rotation axis between at least two consecutive sprockets of the sprocket assembly, measured between an area of engagement with the chain of a sprocket of the at least two consecutive sprockets having the smallest diameter and an adjacent sprocket, is greater than or equal to a thickness of the sprockets, and the sprockets with the smallest diameter are arranged at greater distances apart than the sprockets with the largest diameter.