A bearing of the type comprising an inner ring (2), an outer ring (3) and a plurality of rolling bodies (4) which permit the relative rotation between the rings and which are interposed between these in an annular space (5) closed by a sealing assembly (7) which comprises an elastomeric annular element (11) carried by a rigid support element (12) and provided with an annular lip (14) having a V-shape in radial section. The main characteristic of the present invention lies in the fact that on the outer surface of the inner ring (2) there is formed, for example by grinding, an annular seat (17) having two sliding surfaces (16, 15) respectively substantially orthogonal and substantially coaxial to the axis of the inner ring (2) and on which a respective part (21, 22) of the lip (14) is able to cooperate by sliding and with interference.