Abstract: A wheel mask provided to protect the vehicle wheels during chemical treatment of the tires is a unitary thin plastic molding having a circular concave body that includes a central hub having an exterior handle and terminates in a flared outer periphery. The flared outer periphery includes a plurality of radially-spaced annular raised ridges, each having tapered annular inner and outer walls connected by an annular crown. Each ridge corresponds to a specific size wheel rim. A plurality of annular depressed grooves are formed at the juncture of adjacent inner and outer walls. The handle is inwardly open and formed of walls which project outwardly of the hub and are tapered to permit partial insertion of a handle of another mask, and the ridge walls are angled outwardly to enhance stacking of a plurality of masks.