Tire having greater resistance to unseating

A tire capable of being mounted on a mounting rim, comprising:

• two beads, which are capable of coming into contact with the mounting rim, each bead comprising an axially outer side and a radially inner seat;
• each said bead in meridian cross-section having a radially innermost point positioned with respect to the side at an axial distance D, referred to as the axial width at the seat, and comprising a bead filler, made up of at least one rubber composition, and a circumferential reinforcing element;
• the meridian cross-section of the circumferential reinforcing element having a radially innermost point, a radially outermost point and an axially innermost point, the radially innermost point being positioned at a radial distance Z and an axial distance Y from the radially innermost point of the bead;
• a carcass reinforcement connecting the two beads and comprising a carcass layer extending in each said bead radially towards the inside as far as a carcass layer end;
• for at least one said bead, the carcass layer end is positioned radially on the inside of a point of greatest axial width of the tire and axially on the outside of the axially innermost point of the circumferential reinforcing element,
• wherein, for each of the at least one said bead, the ratio Y/D between the axial distance Y from the radially innermost point of the circumferential reinforcing element to the radially innermost point of the bead, and the axial width of the bead at the seat D, is greater than or equal to 0.5,
• wherein, for each of the at least one said bead, the ratio Z/D between the radial distance Z from the radially innermost point of the circumferential reinforcing element to the radially innermost point of the bead, and the axial width of the bead at the seat D, is less than or equal to 0.4,
• wherein, in each of the at least one said bead, every part of the carcass reinforcement radially inside of the radially outermost point of the circumferential reinforcing element is axially on the outside of the radially innermost point of the circumferential reinforcing element,
• wherein, each of the at least one said bead comprises a bead reinforcement, comprising a bead layer, surrounding the bead filler in such a way that the axially outermost end of the bead layer is radially on the outside of the radially innermost end of the carcass layer and such that the axially innermost end of the bead layer is radially on the outside of the radially innermost point of the circumferential reinforcing element,
• wherein, for each of the at least one said bead, the bead reinforcement is close to but not contacting the external surface of the bead such that the points on the bead reinforcement which are positioned radially on the inside of the radially innermost point of the circumferential reinforcing element are positioned, with respect to the closest portion of the external surface of the bead, at a distance, measured perpendicular to the external surface of the bead, that is less than or equal to Z/2, half the radial distance Z between the radially innermost point of the bead and the radially innermost point of the circumferential reinforcing element,
• and wherein, for each of the at least one said bead, the bead filler comprises a bead filler portion at least partially radially on the inside of the radially innermost point of the circumferential reinforcing element, the bead filler portion being made up of a rubber composition and having an elastic modulus at 10% elongation E21 greater than or equal to 15 MPa.