A chain link plate includes an elliptical plate body having opposite first and second surfaces, and two mounting holes spaced apart from each other in a longitudinal direction of the plate body and extending from the first surface to the second surface. The plate body has a central longitudinal line that passes through centers of the mounting holes, and two transverse lines that pass respectively through the centers of the mounting holes and that are perpendicular to the central longitudinal line. The plate body has an intermediate juncture portion defined between the transverse lines, and opposite end portions integrally and respectively connected to opposite ends of the intermediate juncture portion. The intermediate juncture portion has a largest width greater than that of each of the end portions.
An outer chain plate for a bicycle drive chain includes an elongated plate body with upper and lower edges, two end portions formed with a respective hole, and a waist portion interconnecting the end portions. The plate body has an outer face which is formed with a generally S-shaped longitudinal recess that includes a straight connecting portion formed in the waist portion, and insert portions which are disposed on two ends of the straight connecting portion and which surround a respective one of the holes. The longitudinal recess has two open ends which extend respectively from the insert portions and which open in opposite directions toward a respective one of the upper and lower edges of the plate body. The plate body further has an inner face which is formed with a generally S-shaped longitudinal projection. The longitudinal projection has a shape that corresponds to that of the longitudinal recess and includes a connecting portion formed in the waist portion and two flat portions which are disposed on two ends of the connecting portion and which surround a respective one of the holes.