US Patent 8096908 Bicycle sprocket with a laterally projecting gear change tooth

A sprocket comprises a sprocket body and a plurality of sprocket teeth extending radially outwardly from a root portion of the sprocket body. The sprocket body has a first side surface and a second side surface, wherein a root portion side surface of the root portion defines a root portion plane at the first side surface of the sprocket body. A shift assist recess is formed in the root portion below a first sprocket tooth at the first side surface of the sprocket body, and a second sprocket tooth has a projecting portion that extends laterally outwardly from the root portion plane at the first side surface of the sprocket body.