Drive chain for bicycle

A drive chain for bicycle, comprising:

• a plurality of outer plates, each having a first middle portion and two outer pivoting ends, wherein the two outer pivoting ends extend from the two opposite ends of the first middle portion respectively, and each of the outer pivoting ends has:
• an outer pivoting hole, wherein a virtual line connecting centers of the two outer pivoting holes of each of the outer plates is defined as a first major axis, and at least one of the outer pivoting ends has at least one first protruding surface;
• a plurality of inner plates, each having a second middle portion and two inner pivoting ends, wherein the two inner pivoting ends extend from two opposite ends of the second middle portion respectively, and each of the inner plates has:
• two inner pivoting holes, formed at the two inner pivoting ends respectively, wherein a virtual line connecting centers of the two inner pivoting holes of each of the inner plates is defined as a second major axis;
• and
• a first protruding portion, disposed in the second middle portion and having at least one second protruding surface,
• wherein each of the outer plates further has an inner surface and an outer surface, and the inner surface is a side surface facing the adjacent inner plate;
• and
• a plurality of pins, each threaded through the two inner plates and the two outer plates, so that the outer plate and the inner plate relatively pivot with each other by using the pin as a pivot axis,
• wherein an included angle is formed between the first major axis and the second major axis, the first protruding surface contacts and overlaps the second protruding surface to form an overlapping region, and an area of the overlapping region decreases as the included angle decreases.