Set of a solitary bicycle chainring of a bicycle front crankset and a drive chain, wherein the chainring is adapted for engagement with the drive chain formed as a roller drive chain, the roller drive chain including alternating outer and inner chain links (20, 22) defining outer and inner link spaces (40, 42), respectively, the bicycle chainring comprising: a plurality of teeth extending from a periphery of the chainring wherein the plurality of teeth are formed about the periphery of the chainring; the plurality of teeth consists of an even number; the plurality of teeth including a first group of teeth and a second group of teeth, wherein each of the first group of teeth is wider in axial direction of the chainring than each of the second group of teeth, wherein each tooth of the plurality of teeth includes an outboard side and an inboard side opposite the outboard side and each tooth of the first group of teeth includes at least a first protrusion on the outboard side and each tooth of the second group of teeth is free of protrusions; wherein the first group of teeth and the second group of teeth are equal in number; and wherein the teeth of the second group of teeth are arranged alternatingly and adjacently between teeth of the first group of teeth, such that a single tooth of the first group of teeth is arranged between two successive teeth of the second group of teeth, respectively, wherein each tooth of the first group of teeth is sized and shaped such that it is adapted to fit within one of the outer link spaces (40, 42) and each of the second group of teeth is sized and shaped such that it is adapted to fit within one of the inner link spaces (40, 42); and wherein the at least one first protrusion causes an overall axial width (WO 2, WO 3, WO 4) of each of the teeth of the first group of teeth to be greater than the overall axial width (WO 1) of each of teeth of the second group of teeth by the extent of the at least one first protrusion, wherein the at least one first protrusion is positioned along the outboard side of a tooth of the first group of teeth in a first position where the at least one first protrusion effectively functions to position the chain on the chain ring, characterized by a second position higher than the base on each tooth of the first group of teeth and halfway between a root circle and an outside circle, wherein the overall axial width of each tooth of the first group of teeth at said second position fills at least 75 percent of an axial distance (D 2) defined by the outer link spaces (40, 42) and each tooth of the first group of teeth has, in this second position, the same longitudinal length L T as the teeth of the second group of teeth. a plurality of teeth extending from a periphery of the chainring wherein the plurality of teeth are formed about the periphery of the chainring; the plurality of teeth consists of an even number; the plurality of teeth including a first group of teeth and a second group of teeth, wherein each of the first group of teeth is wider in axial direction of the chainring than each of the second group of teeth, wherein each tooth of the plurality of teeth includes an outboard side and an inboard side opposite the outboard side and each tooth of the first group of teeth includes at least a first protrusion on the outboard side and each tooth of the second group of teeth is free of protrusions; wherein the first group of teeth and the second group of teeth are equal in number; and wherein the teeth of the second group of teeth are arranged alternatingly and adjacently between teeth of the first group of teeth, such that a single tooth of the first group of teeth is arranged between two successive teeth of the second group of teeth, respectively, wherein each tooth of the first group of teeth is sized and shaped such that it is adapted to fit within one of the outer link spaces (40, 42) and each of the second group of teeth is sized and shaped such that it is adapted to fit within one of the inner link spaces (40, 42); and wherein the at least one first protrusion causes an overall axial width (WO 2, WO 3, WO 4) of each of the teeth of the first group of teeth to be greater than the overall axial width (WO 1) of each of teeth of the second group of teeth by the extent of the at least one first protrusion, wherein the at least one first protrusion is positioned along the outboard side of a tooth of the first group of teeth in a first position where the at least one first protrusion effectively functions to position the chain on the chain ring, characterized by a second position higher than the base on each tooth of the first group of teeth and halfway between a root circle and an outside circle, wherein the overall axial width of each tooth of the first group of teeth at said second position fills at least 75 percent of an axial distance (D 2) defined by the outer link spaces (40, 42) and each tooth of the first group of teeth has, in this second position, the same longitudinal length L T as the teeth of the second group of teeth.