Anchoring of a tire carcass

A tire containing a crown, two sidewalls and two beads, a carcass reinforcement with first reinforcing layers placed adjacent, aligned circumferentially in at least one circumferential alignment from at least one of said beads to one of said sidewalls and anchored in said one bead, and a crown reinforcement, said one bead containing an anchoring zone enabling the carcass reinforcement to be maintained and including at least one circumferentially oriented second reinforcing layer cooperating with an adjacent portion of the carcass reinforcement by means of a rubber anchoring compound in contact with the second reinforcing layer and the adjacent sections of the first reinforcing layers, wherein the rubber anchoring compounds:

• comprises an SBR of Tg ranging between −70 and −25° C. with a proportion by weight exceeding 20% of the total weight of elastomers;
• comprises a polybutadiene of Tg ranging between −110 and −90° with a proportion by weight or less than 40% of the total weight of elastomers;
• and
• has a total proportion of synthetic elastomer exceeding 50% of the total weight of elastomers.