Tire bead with protective rib

A tire P with radial carcass reinforcement, intended for mounting on a rim J at least one of whose seats is inclined outwards and is extended axially on the outside by a hump of small height, said hump comprising an axially outer wall, and comprising two sidewalls and at least one bead with a heel axially on the inside and a bead toe axially on the outside, said bead being provided with a protective rib T extending in the circumferential direction and having at least one point axially further away from the equatorial plane than the axially outer wall of the rim hump in order to protect said rim, wherein, when this tire is mounted on its mounting rim and viewed in meridian cross-section:

• said circumferential protective rib T is delimited axially on the outside by an axially outer face AB connected to the outer walls of the sidewall and the bead by radially upper and lower faces AD and BC, respectively,
• the axially outermost point of the axially outer face AB of said protective rib T is a distance e at least equal to 0.5 mm further out than the axially outer wall of the hump of the rim,
• the radial distance d′ between the radially innermost point of the axially outer face of said protective rib T and the radially outermost point of the rim hump, is greater than 4 mm,
• the angle of the segment joining the end points of the axially outer face of said protective rib T with a direction perpendicular to the rotation axis is at most equal to ±10°,
• the entire profile of said lower face BC connecting said axially outer face AB of said protective rib T and the profile of the bead is located radially outside a virtual segment whose ends are on the one hand the radially innermost point B of the axially outer face of said protective rib and, on the other hand, a point C′ of the tire bead that is the last point in contact with the hump of the rim.