Extended-Mobility Tyre Comprising A Flexible Sidewall

A tire for a vehicle wheel, comprising:

• two sidewalls spaced apart axially from each other, joined at their radially outer portions by a crown zone provided on its radially outer portion with a circumferential tread;
• beads, arranged radially to the inside of each of the sidewalls, each bead comprising a seat and an outer flange which are intended to come into contact with a suitable rim;
• a reinforcement structure extending substantially radially from each of the beads, along the sidewalls, towards the crown zone;
• at least one of said beads comprising:
• a bead seat comprising a generatrix the axially inner end of which is located on a circle of diameter greater than the diameter of the circle on which the axially outer end is located;
• a bead wire;
• a zone for anchoring the reinforcement structure in said bead, comprising an upturn of said carcass-type reinforcement structure around said bead wire, radially to the inside thereof, from the axially inner side towards the side axially external to the bead wire;
• a bearing zone, radially substantially close to and axially external to said bead wire, said bearing zone consisting of a rubber mix of substantially high modulus (preferably greater than 40 MPa);
• an anchoring closure zone, substantially radially to the outside of the bead wire, the location of which is defined on one hand by an imaginary bead wire axis (At), which is substantially axial and passes substantially radially externally to said bead wire, and on the other hand an imaginary axis alpha, which passes substantially radially externally to the bearing zone and has an angle alpha of less than 50° and preferably less than 45°, said angle alpha being measured between the bead wire axis (At) and said axis alpha, in a clockwise direction.