comprise aliphatic polyamide cables parallel to one another in each ply 10 or 11 and crossed from one ply 10 to the next 11 making with the circumferential direction an angle of 74 u00b0 such angle being measured in the equatorial plane of the tire two carcass half plies 12 axially on the outside complete the reinforcement 1 and are formed of the same elements as those constituting the main plies 10 and 11 each half ply 12 has a radially lower end located slightly above the line parallel to the rotation axis and tangential to the contour of the bead wire 2 and a radially upper end located under the edge of the crown reinforcement 5 the crown reinforcement 5 is radially under the tread and comprises a working reinforcement comprising two plies 51 and 52 of aromatic polyamide cables crossed from one ply 51 to the next 52 and making an angle of 34 u00b0 with the circumferential direction the axial widths of the working plies 51 and 52 are unequal but essentially equal to the width of the tread 9 they are surmounted radially by a ply 53 of width equal to the two above widths which is obtained by winding a cable of aromatic polyamide which confers upon it an approximately circumferential direction an additional inextensible reinforcement ring 3 is arranged in each sidewall of the tire and the center of gravity g 2 of its meridian section is radially located a.