A flanged bearing ring (10) for the wheel of a motor vehicle includes two different materials joined as a single piece: a tubular core (15) and an outer body (16) around the core. The outer body forms a radial flange (17) and is made of a lighter material than that of the core. At the axially outer end of the ring, at the side where the flange (17) is provided, the interface surfaces between the external body (16) and the core (15) terminate in a groove (21) formed partly in the outer body and partly in the core. The groove (21) accommodates a sealing ring of polymeric material (22) which is cast and continuously covers a circular separation line (23) at the axially outer end of the interface between the core (15) and the outer body (16).