Chain-closing link for a bicycle chain, comprising two closing parts each with a closing plate (10, 410, 510) and a chain pin connected in a rotationally fixed manner to the closing plate (10, 410, 510), - wherein the closing plate (10, 410, 510) has a first end region, a second end region and a connecting region (15, 415) between the two end regions (11, 12), - and, furthermore, a slot (20, 420), comprising an introduction opening, a retaining opening and a displacement region located between the introduction opening and the retaining opening, is arranged in the first end region of the closing plate (10, 410, 510), wherein the displacement region narrows from the introduction opening in the direction of the retaining opening and forms a narrowed neck location (26, 426), - wherein the chain pin has at one end a pin head with a pin neck and has at the other end a pin foot, - wherein a diameter of the introduction opening is larger than a diameter of the pin head, and a diameter of the retaining opening is smaller than the diameter of the pin head and larger than a diameter of the pin neck, - wherein the narrowed neck location (26, 426) is dimensioned to be smaller than the diameter of the pin neck, and - a clamping region (27, 427) is arranged between the narrowed neck location (26, 426) and the retaining opening of the slot (20, 420) and is dimensioned to be smaller than the diameter of the pin neck, characterized in that the closing plate (10, 410, 510) has an asymmetrical form with respect to the longitudinal axis thereof, and the connecting region (15, 415) of the closing plate (10, 410, 510) has a concave peripheral region and a non-concave peripheral region, wherein the non-concave peripheral region is in the form of a rectilinear edge region. - wherein the closing plate (10, 410, 510) has a first end region, a second end region and a connecting region (15, 415) between the two end regions (11, 12), - and, furthermore, a slot (20, 420), comprising an introduction opening, a retaining opening and a displacement region located between the introduction opening and the retaining opening, is arranged in the first end region of the closing plate (10, 410, 510), wherein the displacement region narrows from the introduction opening in the direction of the retaining opening and forms a narrowed neck location (26, 426), - wherein the chain pin has at one end a pin head with a pin neck and has at the other end a pin foot, - wherein a diameter of the introduction opening is larger than a diameter of the pin head, and a diameter of the retaining opening is smaller than the diameter of the pin head and larger than a diameter of the pin neck, - wherein the narrowed neck location (26, 426) is dimensioned to be smaller than the diameter of the pin neck, and - a clamping region (27, 427) is arranged between the narrowed neck location (26, 426) and the retaining opening of the slot (20, 420) and is dimensioned to be smaller than the diameter of the pin neck, characterized in that the closing plate (10, 410, 510) has an asymmetrical form with respect to the longitudinal axis thereof, and the connecting region (15, 415) of the closing plate (10, 410, 510) has a concave peripheral region and a non-concave peripheral region, wherein the non-concave peripheral region is in the form of a rectilinear edge region.