ince the adhesive 60 covers substantially the entire interface between the cover 13 and the disc 12, it is effective to provide a seal and prevent water, mud, salt and other debris from entering between the cover 12 and the outboard facing surface of the disc 12. [0041] Preferably, the distance X of the second surface 42 of the groove 40 is at least equal to the combined thicknesses of the wheel c