A tire having at least a first bead, the seat of which has a generatrix whose axially inner end lies on a circle of diameter greater than the diameter of the circle on which the axially outer end is located, and a radial carcass reinforcement winding within each bead around at least one heel reinforcement element, passing from the inside to the outside to form an upturn, the meridian profile of the carcass reinforcement, when the tire is mounted on its operating rim and inflated to the recommended pressure, having a constant direction of curvature in the first bead and a sidewall extending it radially, and having a tangent TTnull to the point of tangency T of the carcass reinforcement profile with the annular element of the first bead which forms with the axis of rotation an angle null which is open towards the outside and is greater than 45null, wherein, viewed in meridian section, at least the sidewall extending the first bead comprises a reinforcing profiled element having, viewed in section, substantially the form of a crescent, one of the axially inner or outer faces of the, crescent-shaped profiled element follows the profile of the carcass reinforcement, and the trace of the face of the crescent-shaped profiled element opposite the face of such profiled element closest to the carcass reinforcement has a single direction of curvature.