Shift assist projection for bicycle sprocket

摘要

A shift assist projection is provided on a large bicycle sprocket to assist in shifting a chain to the sprocket from an adjacent smaller sprocket. The shift assist projection extends axially from one side of the sprocket. The shift assist projection has an axially facing chain catching surface that faces the center plane and the teeth of the large sprocket to engage an outer link plate of the chain. The chain catching surface is preferably angled a varying amount relative to the center plane of the large sprocket. The chain catching surface preferably has a rearward most rotational edge that is located closer to the center plane than a forward most rotational edge as viewed substantially along a moving direction of the chain when the chain is being shifted from the smaller sprocket to the large sprocket.