Tyre in the form of a torus open radially on the inside with an inner wall and an outer wall, the said inner wall being at least partially covered with an airtight layer, a crown, two sidewalls and two beads, a crown reinforcement (80, 90) and a carcass reinforcement anchored in the two beads and extending at least from the said beads as far as the crown, each bead comprising an annular reinforcing structure, the said annular reinforcing structure comprising several windings of a single metal thread, which windings are arranged axially side by side in several radially superposed layers so as to define a hexagonal cross section, characterized in that the said airtight layer is, at least in part, covered with a layer of self-sealing product, in that an additional reinforcing lentil is arranged in the region of the said sidewalls between the said airtight layer and the said carcass reinforcement, and the said additional reinforcing lentil is a rubber compound with a maximum thickness comprised between 0.5 and 10 mm, and preferably between 0.5 and 4 mm, and in that, - with the said carcass reinforcement comprising a plurality of carcass reinforcing elements, arranged adjacently and circumferentially aligned, anchored in the two beads by a turn-up around the annular reinforcing structure, so as to form within each bead an outward strand and a return strand, each return strand extending radially outwardly as far as an end situated a radial distance DRR from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRR is greater than or equal to 7% and less than or equal to 30% of the radial height H of the tyre; - with each bead comprising a rubber compound referred to as filling, the filling being situated radially on the outside of the annular reinforcing structure and at least partially between the outward strand and the return strand of the carcass reinforcement, the filling extending radially on the outside of the radially innermost point of the annular reinforcing structure of the bead as far as a radial distance DRB from the said point, the radial distance DRB is comprised between 20 and 45% of the radial height H of the tyre; - with each bead further comprising a rubber compound referred to as outer strip positioned axially on the outside of the carcass reinforcement and of the filler, each outer strip extending radially between a radially inner end of the outer strip and a radially outer end of the outer strip, the radially inner end of the outer strip being situated a distance DRI from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRI is comprised between 1 and 10% of the radial height H of the tyre, the radially outer end of the outer strip being situated a distance DRL from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRL is comprised between 35 and 50% of the radial height H of the tyre. - with the said carcass reinforcement comprising a plurality of carcass reinforcing elements, arranged adjacently and circumferentially aligned, anchored in the two beads by a turn-up around the annular reinforcing structure, so as to form within each bead an outward strand and a return strand, each return strand extending radially outwardly as far as an end situated a radial distance DRR from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRR is greater than or equal to 7% and less than or equal to 30% of the radial height H of the tyre; - with each bead comprising a rubber compound referred to as filling, the filling being situated radially on the outside of the annular reinforcing structure and at least partially between the outward strand and the return strand of the carcass reinforcement, the filling extending radially on the outside of the radially innermost point of the annular reinforcing structure of the bead as far as a radial distance DRB from the said point, the radial distance DRB is comprised between 20 and 45% of the radial height H of the tyre; - with each bead further comprising a rubber compound referred to as outer strip positioned axially on the outside of the carcass reinforcement and of the filler, each outer strip extending radially between a radially inner end of the outer strip and a radially outer end of the outer strip, the radially inner end of the outer strip being situated a distance DRI from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRI is comprised between 1 and 10% of the radial height H of the tyre, the radially outer end of the outer strip being situated a distance DRL from the radially innermost point of the annular reinforcing structure of the bead, the radial distance DRL is comprised between 35 and 50% of the radial height H of the tyre.