A cold rolling method for forming a bearing ring with an outer surface having a given contour and an inner surface having a given contour, the method comprising the steps of: (a) providing two substantially identical annular blanks (20, 30) each defining a central axis (x) and each having a radially inner surface (21, 31), a radially outer surface (22, 32), and a side surface (27, 37) which extends perpendicularly to the central axis (x), wherein the radially outer surface (22, 32) of each annular blank (20, 30) has an asymmetrical contour when viewed in axial section, with two opposite axial ends and a radial thickening (26, 36) at one of the two axial ends; (b) providing a forming mandrel rotatable about a first axis and having a working surface with an outer contour defining a plane of symmetry (p) with respect to the first axis; (c) providing an outer forming tool rotatable about a second axis parallel to the first axis, the outer forming tool having a working surface with a contour which is axially symmetric with respect to the plane of symmetry (p); (d) placing the two annular blanks (20, 30) between the forming mandrel and the outer forming tool with the two blanks axially positioned side to side with the respective side surfaces mutually abutting in the plane of symmetry (p); (e) causing the forming mandrel and the outer forming tool to rotate about respective first and second axes (x1, x2), and simultaneously varying in controlled manner the distance between the first and the second axes, bringing the working surface of the outer forming tool in contact with the radially outer surfaces (22, 32) of the annular blanks and the working surface of the forming mandrel in contact with the radially inner surfaces (21, 31) of the annular blanks, so as to radially press and plastically deform the annular blanks (20, 30) between the forming mandrel and the outer forming tool; characterized in that the side surface (27, 37) which extends perpendicularly to the central axis (x) is located at the axial end that provides the radial thickening (26, 36), and that the working surface of the outer forming tool provides at least a portion shaped as an annular recess having an axially symmetrical shape with respect to the plane of symmetry (p). (a) providing two substantially identical annular blanks (20, 30) each defining a central axis (x) and each having a radially inner surface (21, 31), a radially outer surface (22, 32), and a side surface (27, 37) which extends perpendicularly to the central axis (x), wherein the radially outer surface (22, 32) of each annular blank (20, 30) has an asymmetrical contour when viewed in axial section, with two opposite axial ends and a radial thickening (26, 36) at one of the two axial ends; (b) providing a forming mandrel rotatable about a first axis and having a working surface with an outer contour defining a plane of symmetry (p) with respect to the first axis; (c) providing an outer forming tool rotatable about a second axis parallel to the first axis, the outer forming tool having a working surface with a contour which is axially symmetric with respect to the plane of symmetry (p); (d) placing the two annular blanks (20, 30) between the forming mandrel and the outer forming tool with the two blanks axially positioned side to side with the respective side surfaces mutually abutting in the plane of symmetry (p); (e) causing the forming mandrel and the outer forming tool to rotate about respective first and second axes (x1, x2), and simultaneously varying in controlled manner the distance between the first and the second axes, bringing the working surface of the outer forming tool in contact with the radially outer surfaces (22, 32) of the annular blanks and the working surface of the forming mandrel in contact with the radially inner surfaces (21, 31) of the annular blanks, so as to radially press and plastically deform the annular blanks (20, 30) between the forming mandrel and the outer forming tool;