Pneumatic tires for vehicle wheels

In a pneumatic tire for motor vehicles having a generally trapezoidal section and comprising a top portion which is generally convex towards the outside and wider than any other part of the tire, beads, and two sidewalls which spread outwardly from the beads to zones which connect the sidewalls and said top portion, said sidewalls being convex towards the inside and in a condition of substantial compression when the tire is inflated, said top portion having a central tread portion which is normally in contact with the ground when the tire is under load and during rectilinear running of the vehicle, said widewalls being more flexible, at least in the zones which connect them to said shoulders than in the central part of the sidewalls and the shoulders, thereby forming hinges, said top portion comprising a generally annular breaker structure which is substantially inextensible in axial and circumferential directions, the improvement wherein said annular breaker structure is folded at its ends about an annular metallic strap member disposed in each shoulder, and in any radial section of the tire the cincture connection angle between the straight line connecting the center of said shoulder hinge with the center of said strap and a first reference straight line parallel to the axis and passing through the center of said hinge, is between -10.degree. and 30.degree., said cincture connection angle being negative when lying in a radially inner position with respect to the above-said first reference straight line.