Patent ID: 8574108

Claim:
A sprocket comprising a central portion comprising: a central-portion body having a first thickness; a central-portion outer edge defined in part by a central-portion rim extending from the central-portion body having a second thickness that is less than the first thickness; and, a plurality of central-portion half-hole coupling slots defined by the central portion rim and positioned at an outermost edge of the central-portion body and on a peripheral face facing radially and extending the entire thickness of the peripheral face; and a peripheral portion comprising: a peripheral-portion body having a thickness substantially the same as the first thickness; a peripheral-portion inner edge defined in part by a peripheral-portion rim extending from the central-portion body having a third thickness that is less than the first thickness; and, a plurality of peripheral-portion coupling orifices each having a portion defined by both the peripheral-portion body and a portion defined by the peripheral-portion rim, and wherein the central portion and peripheral portion are configured to couple, with the peripheral portion being peripheral to the central portion, with the peripheral-portion rim abutting the central-portion rim, and with the plurality of central-portion half-hole coupling slots corresponding to the peripheral-portion coupling orifices and defining a plurality of sprocket coupling holes.