Outer chain plate of a bicycle drive chain

An outer chain plate of a bicycle drive chain, said outer chain plate including an elongated plate body with upper and lower edges, two end portions formed with a respective hole, and a waist portion interconnecting said end portions, said plate body having an outer face which is formed with a generally S-shaped longitudinal recess that includes a straight connecting portion formed in said waist portion, and insert portions which are disposed on two ends of said straight connecting portion and which surround a respective one of said holes, a wall surface confining one of said insert portions and an inner wall surface confining the respective one of said holes being displaced by a predetermined distance, said longitudinal recess having two open ends which extend respectively from said insert portions and which open in opposite directions toward a respective one of said upper and lower edges of said plate body, said plate body further having an inner face which is formed with a generally S-shaped longitudinal projection, said longitudinal projection having a shape that corresponds to that of said longitudinal recess and including a connecting portion formed in said waist portion and two flat portions which are disposed on two ends of said connecting portion and which surround a respective one of said holes.