A cam phasing system configured to vary a rotational relationship between a cam shaft and a crank shaft of an internal combustion engine, the cam phasing system coupled to an actuation mechanism, the cam phasing system comprising: a sprocket hub configured to be coupled to the crank shaft, the sprocket hub including an inner surface; a cradle rotor configured to be coupled to the cam shaft, the cradle rotor including a central hub which is at least partially received within the sprocket hub; at least one sleeve (114, 128) at least partially received within the sprocket hub and arranged radially between the inner surface of the sprocket hub and the central hub of the cradle rotor and being connected in a torque transmitting manner to at least one of the inner surface of the sprocket hub and the central hub of the cradle rotor; a plurality of locking mechanisms each including a first locking feature and a second locking feature, wherein each of the first locking features and the second locking features are moveable between a locked position and an unlocked position, the plurality of locking mechanisms being circumferentially spaced and in engagement with the at least one sleeve (114, 128) so that said at least one sleeve acts as a wear surface for the sprocket hub and/or the cradle rotor respectively against the plurality of locking mechanisms; and a spider rotor at least partially received within the sprocket hub and configured to rotate to a known rotary position relative to the sprocket hub in response to an input displacement applied thereto by the actuation mechanism; wherein the first locking features are configured to move to the unlocked position and the second locking features are configured to remain in a locked position in response to rotation of the spider rotor to the known rotary position relative to the sprocket hub, and wherein when the first locking features move to the unlocked position, the cradle rotor is configured to rotate relative to the sprocket hub and rotationally follow the spider rotor to the known rotary position relative to the sprocket hub until the contact of the spider rotor no longer acts on the locking mechanisms. a sprocket hub configured to be coupled to the crank shaft, the sprocket hub including an inner surface; a cradle rotor configured to be coupled to the cam shaft, the cradle rotor including a central hub which is at least partially received within the sprocket hub; at least one sleeve (114, 128) at least partially received within the sprocket hub and arranged radially between the inner surface of the sprocket hub and the central hub of the cradle rotor and being connected in a torque transmitting manner to at least one of the inner surface of the sprocket hub and the central hub of the cradle rotor; a plurality of locking mechanisms each including a first locking feature and a second locking feature, wherein each of the first locking features and the second locking features are moveable between a locked position and an unlocked position, the plurality of locking mechanisms being circumferentially spaced and in engagement with the at least one sleeve (114, 128) so that said at least one sleeve acts as a wear surface for the sprocket hub and/or the cradle rotor respectively against the plurality of locking mechanisms; and a spider rotor at least partially received within the sprocket hub and configured to rotate to a known rotary position relative to the sprocket hub in response to an input displacement applied thereto by the actuation mechanism; wherein the first locking features are configured to move to the unlocked position and the second locking features are configured to remain in a locked position in response to rotation of the spider rotor to the known rotary position relative to the sprocket hub, and wherein when the first locking features move to the unlocked position, the cradle rotor is configured to rotate relative to the sprocket hub and rotationally follow the spider rotor to the known rotary position relative to the sprocket hub until the contact of the spider rotor no longer acts on the locking mechanisms.