A wheel rim for motor-vehicles comprising: - a peripheral structure that extends circumferentially around a predefined first axis (A), said peripheral structure being arranged to receive a tire (T); and - a central structure , internally integral with said peripheral structure and provided with means for coupling, along said first axis (A), with a hub (H) of the motor-vehicle, wherein said peripheral structure comprises an axially inner portion , an axially outer portion and a central portion , interposed between said axially inner portion and said axially outer portion , wherein said central portion comprises a circumferential well, where the radius of the wheel rim is minimum, and wherein each of said axially inner portion and said axially outer portion comprises in sequence: - a respective peripheral flange ; - a connecting wall , which joins a respective peripheral flange and extends axially towards said central portion , wherein each connecting wall is substantially frustoconical and has a first axial end with greater radius, which is joined to a respective peripheral flange , and a second axial end with lesser radius, which faces said central portion , and wherein each connecting wall , together with the respective peripheral flange , forms a seat for receiving the bead of said tire (T); - a connecting part , which is interposed between a respective connecting wall and said central portion , wherein the connecting part of at least one of said axially inner portion and said axially outer portion comprises a first curved region which connects with said central portion , wherein the connecting part which comprises said first curved region further comprises a second curved region which is interposed between said first curved region and the second axial end with lesser radius of the respective connecting wall , said second curved region consisting of a convex profile when seen from the side of the wheel rim on which said tire (T) is fitted, said second curved region comprising: - a first curved surface , which is joined to the second axial end with lesser radius of the respective connecting wall and which has a first radius of curvature (R1); the rim being characterized in that said second curved region further comprises a second curved surface , which is interposed between said first curved surface and said first curved region and which has a second radius of curvature (R2) different from said first radius of curvature (R1). - a peripheral structure that extends circumferentially around a predefined first axis (A), said peripheral structure being arranged to receive a tire (T); and - a central structure , internally integral with said peripheral structure and provided with means for coupling, along said first axis (A), with a hub (H) of the motor-vehicle, - a respective peripheral flange ; - a connecting wall , which joins a respective peripheral flange and extends axially towards said central portion , wherein each connecting wall is substantially frustoconical and has a first axial end with greater radius, which is joined to a respective peripheral flange , and a second axial end with lesser radius, which faces said central portion , and wherein each connecting wall , together with the respective peripheral flange , forms a seat for receiving the bead of said tire (T); - a connecting part , which is interposed between a respective connecting wall and said central portion , - a first curved surface , which is joined to the second axial end with lesser radius of the respective connecting wall and which has a first radius of curvature (R1); the rim being characterized in that said second curved region further comprises a second curved surface , which is interposed between said first curved surface and said first curved region and which has a second radius of curvature (R2) different from said first radius of curvature (R1). <EOS>