Tire bead for light heavy-weight vehicle

An assembly formed of a radial carcass reinforcement tire comprising radially directed reinforcing elements and a mounting rim, wherein the radial carcass reinforcement tire comprises beads intended to come into contact with the mounting rim, wherein the mounting rim comprises a seat extended axially on the outside by a part forming a rim flange the radially outermost part of which is at a distance Rr from the axis of rotation and which has a substantially circular shape in a plane of section containing the axis of rotation, wherein each bead comprises an anchoring bead wire, wherein the tire is reinforced by a carcass reinforcement which in each bead is turned back around the anchoring bead wire to form a turned-back portion which, in a radial plane of section, has one end positioned, once the tire has been mounted on its mounting rim, at a distance Hc from the radially innermost point K of the bead wire which is at least equal to 18 mm and at most equal to 26 mm, wherein the bead comprises, axially on the outside of the turned-back portion of carcass reinforcement, a thickness of material defining a bead external profiled element, wherein the bead external profiled element is such that the distance A measured between the carcass reinforcement and the bead external profiled element in its part that can be in contact with the rim flange is such that

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• wherein B is the distance separating the carcass reinforcement from the end of the turned-back portion of carcass reinforcement, this distance being measured on a straight line perpendicular to the carcass reinforcement and passing through the end of the turned-back portion, wherein the bead comprises, positioned between the carcass reinforcement and the turned-back portion, a first and a second profiled element,
• wherein the first profiled element extends from the bead wire out to a maximum distance Hi, this distance being measured, in a meridian plane of section, with respect to the radially innermost point of the bead wire, the first profiled element being in contact with the turned-back portion out to a distance He, wherein the first profiled element being made of a material having a secant extension modulus at 10% elongation that is greater than 20 MPa,
• and wherein the second profiled element is arranged in the bead in such a way as to be in contact with one face of the first profiled element and with the turned-back portion of carcass reinforcement out from a height equal to He, the second profiled element extending out to a distance H2 measured with respect to the base of the bead wire, this second profiled element being made of a material having a secant extension modulus at 10% elongation that is at least equal to 7 MPa and a secant extension modulus at 100% elongation that is at least equal to 4.5 MPa,
• and wherein the second profiled element has, in the region of the end of the turned-back portion of carcass reinforcement, a thickness of between 1 mm and the axial width of the bead wire, and
• wherein the height He of the first profiled element in contact with the turned-back portion of carcass is such that the coupling length L2, measured between the radially outermost point in contact with the turned-back portion and the axially outermost point Ae of the contact with the bead wire is at most equal to half the length Lr of the turned-back portion, the length Lr being measured as the length of turned-back portion in contact with the first and second profiled elements, i.e. the contact length measured from the end of the turned-back portion to the axially outermost point of contact Ae of the bead wire.