Abstract: Roller chain links, both internal and external which include a link outer profile that contains at least one convex back edge. In an alternate embodiment, the link also contains a concave back edge. Additionally, the links may contain an extra hole or window within the link profile combined with the convex and concave edge profiles for additional mass reduction.

Abstract: A cushion ring (102) is received in a concentric groove in a sprocket (112) with teeth and a hub. More specifically, the groove is defined between an annular portion of the hub and the teeth. The cushion ring has an inner ring (106) and an outer ring (104). The outer ring is made of an incompressible material that has a load bearing area for receiving load from the links of the chain. The load and engagement noise energy of the chain links are combined and distributed over a large area of the outer ring. The inner ring receives this distributed load and noise energy from the outer ring and absorbs most of such energy. This improved distribution decreases wear and increases life of the resilient material while also providing for a reduced level of chain engagement noise.