Tire having reinforced sidewalls

A tire configured to be mounted on a hollow rim of the 15° drop center type, comprising:

• a radial carcass reinforcement made up of a single carcass reinforcement layer formed of reinforcing elements,
• a crown reinforcement, itself capped radially by a tread,
• said tread being joined to two beads via two sidewalls,
• the layer of reinforcing elements of the carcass reinforcement being anchored in each of the beads by being turned up around a bead wire to form a main part of the carcass reinforcement layer extending from one bead wire to the other and a turn-up of the carcass reinforcement layer in each of the beads,
• said turn-up of the carcass reinforcement being reinforced by at least one layer of reinforcing elements or stiffener, wherein in a meridian cross section of said tire,
• wherein in an uninflated state the centers of mass of the bead wires form an axially oriented straight line, said centers of mass being at a distance from each other by a distance equal to the width of the rim increased by 20 mm and decreased by twice a distance measured axially between a center of mass of a bead wire and a point on the outer surface of the tire;
• any point of the profile of an outer surface (S) of the tire, between a first point (F), itself defined by an intersection of an axially oriented straight line, passing through an axially outermost point (E) of the main part of the carcass reinforcement layer and the outer surface (S) of the tire, and a point (A), is at a constant distance (T) from the main part of the carcass reinforcement layer, said distance being measured at any point in a direction normal to the main part of the carcass reinforcement layer,
• the point (A) is radially on the outside of a first circle (C1) of radius R1 that is centered on the end of the turn-up of the carcass reinforcement layer, R1 being between 8 and 13 mm,
• radially on the inside of the point (A), the outer surface (S) of the tire is continued by a circular arc of radius R2, the center of which is axially on the outside of the surface (S) of the tire, and the radius R2 of which is between 50% and 125% of the distance between the point (F) and the center of gravity of the bead wire,
• the circular arc of radius R2 is tangent at its radially innermost end (B) to a circular arc of radius R3, the center of which is axially on the inside of the surface (S) of the tire, and continues the outer surface (S) of the tire radially inwards as far as the point (C), said point (C) being a point of contact between the circular arc of radius R3 and the circle (C2) of radius R1 centered on the radially outermost end of the stiffener,
• said point (C) being radially on the inside of the axially outermost point (D) of the circle (C2),
• the radius R3 being between 50% and 125% of the distance between the point (F) and the center of gravity of the bead wire, and
• the radius R2 is between 1.5 times the radius R1 and 8 times the radius R1.