Tire with specified arrangement of elastomeric polymer compound

Tire with radial carcass reinforcement made up of at least one layer of metal reinforcing elements, the said tire comprising a crown reinforcement made up of at least one layer of reinforcing elements including a radially innermost layer of reinforcing elements, the said crown reinforcement itself radially capped by a tread extending axially between a pair of axial tread ends, the said tread being connected to two beads via two side walls, the said tire comprising a first layer of elastomeric polymer compound radially between the carcass reinforcement and the radially innermost layer of reinforcing elements of the crown reinforcement, wherein the first layer of elastomeric polymer compound extends axially between a pair of first layer axial ends to define an axial width of the said first layer that is equal to the axial width of the radially innermost layer of reinforcing elements of the crown reinforcement,

• wherein the thickness, measured in the radial direction, of said first layer is less than 3φ, φ being the diameter of the reinforcing elements of the radially innermost layer of the crown reinforcement;
• wherein the said first layer thickness is the maximum distance in the radial direction from the carcass reinforcement to the radially innermost layer of reinforcing elements of the crown reinforcement along the entire axial length of the first layer;
• wherein the first layer of elastomeric polymer compound contains a cobalt salt,
• the cobalt salt being at a quantity of 0.2 to 0.3 parts by weight of cobalt per hundred parts by weight of the elastomer in the first layer,
• further comprising a second layer of the elastomeric polymer compound, the second layer being axially in contact with the pair of first layer axial ends of the first layer of the elastomeric polymer compound,
• wherein the second layer of the elastomeric polymer compound extends outwardly in contact with the carcass reinforcement from the pair of first layer axial ends to a pair of axially outer ends each of which extends axially farther than a respective axial end of the radially innermost layer of reinforcing elements of the crown reinforcement, extends axially at least as far as the respective axial end of the tread, and extends axially not as far as the respective axial end of the carcass reinforcement;
• and
• wherein the second layer of the elastomeric polymer compound contains a cobalt salt at a quantity of 0.2 to 0.3 parts by weight of cobalt per hundred parts by weight of the elastomer in the second layer.