Release mechanism (10) for an electronic locking system (156), wherein the release mechanism (10) is configured such that an input member (14) and an output member (16) are locked against relative rotation and can rotate together within a locking ring opening (22) when a locking member (20) is located in an input member recess (42) and in an output member recess (46), and such that the output member (16) is released to rotate relative to the input member (14) when the locking member (20) is located in the output member recess (46) and in a locking ring recess (26). A freewheel mechanism (66) and assemblies (98) for an electronic locking system (156) are also provided.