A chain for use with a sprocket comprising a plurality of links connected together by connecting pins, the links each comprising a body having a pair of apertures for receiving the connecting pins, the apertures being spaced apart by a pitch distance which is an average distance between contact points of the pins within the apertures of the links, and having a pitch line passing through the pair of apertures, the pitch line being defined at the contact points of the pins within the apertures of the link when the links of the chain are in a straight line; and a pair of teeth having outer flanks and inner flanks defining a crotch, the link being formed to drivingly contact sprocket teeth of the sprocket on the outer flanks of the link; characterized in that the link comprises: a) a product of a ratio of a distance between the pitch line and a line which contacts the outer flanks at 1.5 times the pitch distance to the pitch distance and a ratio of a distance below the pitch line to an apex of the crotch to the pitch distance, the product divided by the tangent of an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the line and vertical line intersecting the tangent line, is greater than 0.176; b) a ratio of a distance between the pitch line and a line which contacts the outer flanks at 1.5 times the pitch distance to a product of pitch distance and the tangent of an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 0.790; c) an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the link and a vertical line intersecting the tangent line is less than or equal to 29 degrees; and d) a ratio of a distance from the pitch line to ends of the teeth to a product of the pitch distance and the tangent of the effective inner flank angle between a line tangent to the inner flank of the link at 0.25 times the pitch line from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 1.4. a) a product of a ratio of a distance between the pitch line and a line which contacts the outer flanks at 1.5 times the pitch distance to the pitch distance and a ratio of a distance below the pitch line to an apex of the crotch to the pitch distance, the product divided by the tangent of an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the line and vertical line intersecting the tangent line, is greater than 0.176; b) a ratio of a distance between the pitch line and a line which contacts the outer flanks at 1.5 times the pitch distance to a product of pitch distance and the tangent of an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 0.790; c) an effective outer flank angle (Δ) between a line tangent to the outer flank of the link at 0.75 times the pitch distance from the vertical centerline of the link and a vertical line intersecting the tangent line is less than or equal to 29 degrees; and d) a ratio of a distance from the pitch line to ends of the teeth to a product of the pitch distance and the tangent of the effective inner flank angle between a line tangent to the inner flank of the link at 0.25 times the pitch line from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 1.4.