A locking wheel rim cover is described for attachment to the outer face of a spare wheel rim having a given diameter, an outer face and log openings. The cover includes a circular rim plate having a diameter substantial the same as the diameter of the wheel rim, an inner face and an outer face; a locking member extending inwardly from the inner face of the rim plate; a first attachment member extending inwardly from the inner face of the rim plate; and an attachment bracket mountable on the outer face of the wheel rim, the bracket including a locking member opening to receive the locking member, a second attachment member connectable with the first attachment member and inwardly extending adapters sized for insertion into the wheel lug openings.