Patent ID: 8888629

Claim:
A bicycle sprocket assembly comprising: a sprocket element having first and second annular axially facing side surfaces on opposite sides of the sprocket element, a plurality of teeth disposed on an outer periphery about a center rotation axis and at least one first attachment element, the first attachment element extending from the sprocket element radially inwardly to a cantilevered free end and including an axially extending projecting portion that extends from one of the first and second annular axially facing side surfaces in a direction axially outward from the sprocket element such that the axially extending projecting portion extends from the cantilevered free end that is further radially inward of the sprocket element than a connecting end of the at least one first attachment element that connects the at least one first attachment element to the sprocket element; and a chain protector including a protecting portion, an attachment portion disposed radially inwardly of the protecting portion, and a connecting portion that connects the protecting portion and the attachment portion, the attachment portion has at least one second attachment element that mates with the first attachment element in response to relative rotational movement between the sprocket element and the chain protector, and the connecting portion includes an annular surface that contacts one of the first and second annular axially facing side surfaces opposite to the one of the first and second annular axially facing side surfaces from which the axially extending projecting portion extends.