Abstract: Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements. First layer C of rubber compound is placed between ends of the two working crown layers. Second layer S of polymer compound is in contact with at least one working crown layer and with the carcass reinforcement. The crown reinforcement includes at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of first layer C is less than 8 MPa, the maximum value of tan(?) of first layer C is less than 0.100. The second layer S is made up of a filled elastomer blend having a macro dispersion coefficient Z greater than or equal to 65 and a maximum tan(?) value less than 0.100, and its complex dynamic shear modulus G*, measured at 10% and 60° C. on the return cycle, is greater than 1.35 MPa.

Abstract: A tire comprising a crown reinforcement formed of at least two working crown layers each one formed of reinforcing elements inserted between two skim layers of rubber compound, a first layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of the layer C is greater than 9 MPa, the maximum value of tan(?), denoted tan(?)max, of the layer C is less than 0.100 and the complex dynamic shear modulus G*, measured at 10% and 60° C. on the return cycle, of the first layer S of polymer compound is greater than 1.35 MPa.

Abstract: Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements, crossed from one layer to the other making with the circumferential direction angles comprised between 10° and 45°. A first layer S of polymer compound is in contact with at least one working crown layer and in contact with the carcass reinforcement, the first layer S of polymer compound extending axially as far as at least the axial end of the tread, the first layer S of compound polymer compound is made up of a filled elastomer blend having a macro dispersion coefficient Z greater than or equal to 65 and a maximum tan(?) value, denoted tan(?)max, less than 0.100 and its complex dynamic shear modulus G*, measured at 10% and 60° C. on the return cycle is greater than 1.35 MPa.

Abstract: Tire comprising a crown reinforcement comprising two working crown layers having unequal axial widths. Layer C of rubber compound is placed between ends of the working crown layers. Second layer S of polymer compound is in contact with at least one working crown layer and the carcass reinforcement, which comprises a layer of circumferential reinforcing elements arranged radially between two working crown layers. Distance d between the end of the axially narrowest working layer and the working layer separated from it by layer C is 1.1ø<d<2.2ø, ø being the diameter of the reinforcing elements, in a meridian plane. Second layer S is made up of a filled elastomer blend having a macro dispersion coefficient Z?65 and a maximum tan(?) value less than 0.100. Its complex dynamic shear modulus G*, measured at 10% and 60° C. on the return cycle is greater than 1.35 MPa.

Abstract: A tire the tread of which contains at least three circumferential grooves, having at least three radially superposed layers of elastomeric compounds. A first elastomeric compound constituting the first layer forming the radially outer part of the tread has a maximum value of tan(?)max, greater than 0.110, a second elastomeric compound constituting the second layer radially on the inside has a tan(?)max at least 10% lower than the first elastomeric compound, the radially innermost third layer of the tread consists of at least two first parts and of at least three second parts axially, each one in contact with at least one of the at least two first parts, the at least two first parts axially centered on a radial plane passing through one of the at least three circumferential grooves consisting of the second compound and the at least three second parts consisting of a third elastomeric compound having a maximum value of tan(?), denoted tan(?)max, at least 10% lower than the second elastomeric compound.

Abstract: Tread for a heavy vehicle tire, having a wearable thickness of material PMU and having at least two main grooves of depth P1 close or equal to PMU, delimiting a raised element, at least one secondary groove of depth P2 less than depth P1, extending throughout the raised element, and having a groove bottom, each of the main and secondary grooves oriented in a circumferential or near-circumferential main direction corresponding to the mean direction of flow of liquid in each groove, a plurality of sipes in the raised element, each comprising lateral parts formed on each side of the secondary groove, and connected by a connecting part formed radially towards the inside of the tread from the bottom of the secondary groove, the connecting part having a sipe portion oriented in the main direction of the secondary groove, making an angle at most equal to 30° with the circumferential direction.

Abstract: The invention relates to a tire with radial carcass reinforcement, made up of at least one layer of metal reinforcing elements, the said tire comprising a crown reinforcement, itself radially capped by a tread, the said tread being connected to two beads via two side walls, the said tire comprising a first layer of polymer compound radially between the carcass reinforcement and the radially innermost layer of reinforcing elements of the crown reinforcement. According to the invention, the said first layer of polymer compound constitutes a buffer zone designed to trap oxygen on the outside of the said first layer, the axial width of the said first layer being at least equal to 70% of the width of the radially innermost layer of reinforcing elements of the crown reinforcement.