A single chainring for a bicycle front crank assembly for engagement with a drive chain , comprising: a plurality of teeth which are formed on a circumference of the chainring , wherein the plurality of teeth comprises an even number of teeth ; wherein the plurality of teeth comprises teeth of a first tooth group and teeth of a second tooth group which is alternately arranged between the first tooth group , wherein the teeth of the first tooth group are configured for engaging the drive chain via outer connecting spaces of the drive chain , wherein the teeth of the second tooth group are configured for engaging with the drive chain via inner connecting spaces of the drive chain , wherein the number of teeth of the first tooth group and the number of teeth of the second tooth group are equal, wherein each tooth of the first and second tooth group has an outer surface and an inner surface which is opposite the outer surface , wherein each tooth of the first tooth group comprises at least one first protrusion on the outer surface and each tooth of the second tooth group is formed without first protrusions on the outer surface and on the inner surface , characterised in that the first protrusion is formed by a material deformation on the outer surface of the teeth of the first tooth group , wherein the material deformation is obtained from the inner surface or from the outer surface , wherein the first protrusion is provided at a position close or at the basis of each tooth of the first tooth , at which it effectively contributes to positioning the chain at the chainring, wherein the protrusion substantially extends over the entire length of the tooth. a plurality of teeth which are formed on a circumference of the chainring , wherein the plurality of teeth comprises an even number of teeth ; wherein the plurality of teeth comprises teeth of a first tooth group and teeth of a second tooth group which is alternately arranged between the first tooth group , wherein the teeth of the first tooth group are configured for engaging the drive chain via outer connecting spaces of the drive chain , wherein the teeth of the second tooth group are configured for engaging with the drive chain via inner connecting spaces of the drive chain , wherein the number of teeth of the first tooth group and the number of teeth of the second tooth group are equal, wherein each tooth of the first and second tooth group has an outer surface and an inner surface which is opposite the outer surface , wherein each tooth of the first tooth group comprises at least one first protrusion on the outer surface and each tooth of the second tooth group is formed without first protrusions on the outer surface and on the inner surface , characterised in that the first protrusion is formed by a material deformation on the outer surface of the teeth of the first tooth group , wherein the material deformation is obtained from the inner surface or from the outer surface , wherein the first protrusion is provided at a position close or at the basis of each tooth of the first tooth , at which it effectively contributes to positioning the chain at the chainring, wherein the protrusion substantially extends over the entire length of the tooth. <EOS>