A bicycle chainring (SP1 to SP12), comprising: a
sprocket body (SP1A to SP12A) with a first axially oriented surface (SP1A1) and a second axially oriented surface (SP1A2) which are aligned in the axial direction (D2) with respect to a rotational center axis (A1) of the bicycle
sprocket (SP1 to SP12), wherein the second axially oriented surface (SP1A2) is provided in the axial direction (D2) on a rear side of the first axially oriented surface (SP1A1), wherein the first axially oriented surface (SP1A1) is configured to point in a mounted state in which the bicycle
sprocket (SP1 to SP12) is mounted on a bicycle (10) in the direction of a
median plane (10A) of the bicycle (10); a plurality of sprocket teeth (SP1B to SP12B) extending radially outwards from the sprocket body (SP1A to SP12A) with respect to the axis of rotation (A1); at least one upshift facilitation area (FU1 to FU12) configured to facilitate the transfer of a bicycle chain (C) from the bicycle sprocket (SP1 to SP12) to a smaller bicycle sprocket (SP1 to SP11) located axially (D2) adjacent to the bicycle sprocket (SP1 to SP12) without another bicycle sprocket in between; wherein the plurality of sprocket teeth (SP1B to SP12B) includes at least one axially recessed, upshifting
initiation tooth (SP1U to SP12U) which is axially recessed with respect to the rotational center axis (A1); wherein the at least one axially recessed upshift
initiation tooth (SP1U to SP12U) is arranged and configured in the at least one upshift facilitation area (FU1 to FU12) to release an inner connecting link (C1) of the bicycle chain (C) from the at least one axially recessed upshift
initiation tooth (SP1U to SP12U) during an upshift operation in which the bicycle chain (C) changes from the main chainring (SP1 to SP12) to the smaller bicycle chainring (SP1 to SP11); wherein the at least one axially recessed upshift initiation tooth (SP1U to SP12U) has a driving surface (SP1U1), a non-driving surface (SP1U2) and a tooth tip section (SP1U3); wherein the driving surface (SP1U1) includes a driving surface-
side tooth tip end (E11); wherein the non-driving surface (SP1U2) includes a non-driving
surface tooth tip end (E12); the tooth tip section (SP1U3) connects the driving surface
side tooth tip end (E11) and the non-driving surface
side tooth tip end (E12); the non-driving surface (SP1U2) which extends from the non-driving
surface tooth tip end (E12) in a circumferential direction (D1) with respect to the rotation center axis (A1); the non-riding surface (SP1U2) has a non-riding
surface projection (SP1U4) which is arranged radially inside the non-riding
surface tooth tip end (E12) with respect to the axis of rotation (A1); and wherein the non-riding
surface projection (SP1U4) has a projection tip (SP1U5) which is located in the axial direction (D2) closer to the second axially oriented surface (SP1A2) than the non-riding surface tooth tip end (E12), so that a guide chamfer (SP1U6) extends from the projection tip (SP1U5) to the first axially oriented surface (SP1A1).