Bicycle wheel cover assembly includes two identical flat disks. Each disk includes an outside surface, and inside surface that faces spokes, a radially outer edge surface that fits inside wheel rim radially inner surfaces, and a central bore. A plurality of retainer passages pass through the disk and are spaced from the disk radially outer edge. Retainer assemblies include a tubular retainer member axis that is coaxial with the retainer passage. Each tubular member has an anchored end fixed to the disk and a free end extending away from the disk inside surface. A cam plate is fixed to the free end of each tubular member. Each cam plate has slot, and a retainer groove. A ramp surface extends from the slot to the retainer groove. Each retainer passes through two cam plate slots, cams both disks together and is held in a retainer groove.