(57) [summary] is to provide a chain to easily engage and front sprocket when replacing the gear of the (modified with) [purpose] bicycle transmission. [Configuration] chain is a combination of a plurality of links. Each link has been joined with a roller 5 and pin 6, First internal chain plate 3, a second inner chain plate 4, and a first external chain plate 1 and a second outer chain plate 2. Each chain plate, the inner surface of straight waist located between two semi-circular ends, the inclined surface extending along the edge portions are formed, And it has a blade portion that is fused to the inclined surface in a straight waist. Lateral dimension of the first outer chain plate 1 is larger than that of the second outer chain plate 2, the lateral dimensions of the first inner chain plate 3 is larger than that of the second inner chain plate 4.
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