the outer circumference of the cord is in intimate contact with the rubber compound constituting the bonding rubber u201c sidewalls u201d refers to the portions of the tyre most frequently of low flexural strength located between the crown and the beads u201c sidewall compound u201d refers to the rubber compounds located axially to the outside relative to the cords of the reinforcement structure of the carcass and to their bonding rubber these compounds usually have a low elasticity modulus u201c bead u201d refers to the portion of the tyre radially internally adjacent to the sidewall u201c elasticity modulus u201d of a rubber compound is understood to mean a secant modulus of extension obtained at a uniaxial deformation of extension of the order of 10 at ambient temperature fig1 shows in cross section a tyre 1 according to the invention this tyre comprises a first sidewall 5 adjacent to a first bead 3 which preferably corresponds to the internal bead similarly the opposite portion of the tyre comprises a second sidewall 6 adjacent to a second bead 4 a crown 7 on which there is provided a tread 8 provides the connection between the sidewalls the crown preferably comprises at least one reinforcement belt the tyre also comprises a reinforcement or reinforcing structure 2 of carcass type provided with reinforcements which are advantageously shaped in a substantially radial arrangement this structure may.