Patent ID: 8857842

Claim:
A rear suspension of a bicycle including a rear swing arm coupled to a hub of a rear wheel and articulated by at least two articulation means to a frame bearing a crankset bottom bracket, said bicycle including a transmission chain extending between a driving sprocket wheel secured to the crankset bottom bracket and a driven sprocket wheel secured to the axle of the hub of the rear wheel, and the swing arm pivoting around an instantaneous center of rotation corresponding to the intersection of straight lines passing through the axes of rotation of each of the articulation means of the swing arm, wherein said instantaneous center of rotation is located close to a straight line co-linear with an upper strand of the chain, in a position of static equilibrium and moves forward inside a horizontal band so that said instantaneous centre of rotation moves horizontally when the swing arm moves upwards upon going over an obstacle, and wherein the swing arm and articulation means of the swing arm are configured so that a distant between said instantaneous center of rotation and the straight line co-liner with the upper strand of the chain increases when the swing arm moves upwards to create a restoring moment which tends to bring the swing arm back into the position of static equilibrium, said restoring moment being proportional to a tension of the upper strand of the transmission chain on the one hand and to the distance separating the instantaneous center of rotation from the upper strand of the transmission chain or from the straight line co-linear with the upper strand of the chain on the other hand, is created.