Abstract: A multi-ratio drive including a first sprocket having a first plate with a plurality of concentric circular rows of holes therein for receiving pins in a fully retracted position, a second plate spaced from the first plate and coaxial therewith, a shifting mechanism for moving the retracted pins in a predetermined row from their retracted position to an extended position while causing any pins outside of the predetermined row to remain in a retracted position, a flexible chain having a plurality of spaced links each with a concave configuration for encircling the extended pins to thereby provide a driving engagement with the extended pins, a second sprocket spaced from the first sprocket and having a plurality of second concentric circular rows of holes for receiving second pins therein and a second shifting mechanism for moving the second pins between retracted positions where they are not engaged by the chain to an extended position where they are so engaged so as to provide a driving relationship of a pred