The invention provides for a heavy truck tire (1) having a sub-casing, a belt package (19) and a rubber tread (2), the tread extending axially form a first tread edge (N) to a second tread edge (N) over a rolling tread width (RTW), the tread comprising a shoulder zone (21) adjacent to each of said first and second edges and a center zone (25) separating the two shoulder zones, each shoulder zone comprising a radially lower shoulder layer (24) and a radially upper shoulder layer (22), the upper shoulder layer being intended to come into contact with the ground and the lower shoulder layer being interposed between the belt package and the upper shoulder layer, the upper shoulder layer consisting of an upper shoulder rubber compound, the lower shoulder layer consisting of a lower shoulder rubber compound being different from the upper shoulder rubber compound, wherein: the upper shoulder layer extends a distance LI from a tread edge (N, N) axially inward, the distance LI being greater than 15% and less than 40% of the rolling tread width (RTW); the upper shoulder layer has a thickness (T22) of between 70% and 130% of the tread depth over at least 80% of the distance LI; the lower shoulder layer extends a distance L2 from a tread edge (N, N) axially inward, the distance being greater than 15% of the rolling tread width (RTW); the lower shoulder layer has a thickness of at least 4 mm over the portion of the shoulder zone which covers the belt package; the upper shoulder rubber compound has a G*50 of at least 1.3 Mpa and a max tan (5) of at least 0.12; the lower shoulder rubber compound has a max tan (5) not greater than the max tan (5) of a center rubber compound in the center zone being intended to come into contact with the ground; andthe center rubber compound has a max tan (5) of at most 0.09.

A tire is provided with a tread that includes first and second sectors and grooves. The second sectors are formed of a rigid reinforcing compound. Each of the first and second sectors has a contact face intended to contact a road surface when the tire is in use. Each groove includes sidewalls and a bottom, and extends from an end of an adjacent contact face. A depth P of each groove is measured in a radial direction between its bottom and a position corresponding to a radial height of the adjacent contact face. At least one of the second sectors has a contact face that includes a recess having a depth p of less than 2 mm, as measured in a radial direction from a surface of the recess to a position corresponding to a radial height of an adjacent first sector.

A tire with a radial carcass reinforcement, having a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, having at least two radially superposed layers of elastomeric compounds; a first layer, forming the radially outer part of the tread, has a first elastomeric compound having a modulus G* greater than 1.8 MPa, a second layer of elastomeric compounds radially on the inside of and in contact with the said first layer of elastomeric compound has at least three parts, the axially outer parts having a second elastomeric compound having a maximum value of tan (), denoted tan () max, strictly less than 0.060, and at least a part of the second layer, axially in contact with at least an axially outer part having a third compound with modulus G* greater than 1.2 MPa and at least 5% less than the first elastomeric compound and a maximum value of tan (), tan ()max, between 0.060 and 0.120.

Tire (1) having a sub-layer (7) made up substantially of a base layer (71) disposed radially on the crown reinforcement (5) and axially between the median plane (CP) and a shoulder (60), said base layer (71) being made up of a rubber compound of given stiffness A, a covering layer (72) disposed radially on the base layer (71) and radially on the inside of the tread (6) and axially at least in sections situated between the median plane (CP) and the shoulder end (721), said covering layer (72) being made up of a rubber compound of given stiffness B, the stiffness A being less than the stiffness B, and the stiffness B being greater than the stiffness M.

A tire includes two beads, two sidewalls connected to the beads, and a crown. The crown includes a belt reinforcement, a tread, and a stiffening ply. The belt reinforcement has an axial width W. The tread includes tread pattern blocks and grooves having a groove bottom. The tread is made of a material that has a dynamic shear modulus G* of less than 1.25 MPa. The stiffening ply includes filamentary reinforcing elements that are rigid in terms of compression, and that are arranged under at least one of the grooves of the tread.

In a tire, a tread rubber includes a first layer which is grounded on a road surface in an outer peripheral surface thereof, and a second layer which is joined to an inner peripheral surface of the first layer in an outer peripheral surface thereof, the first layer includes a joint portion where rubbers having different elastic modulus are joined, and the second layer is formed by a rubber having a greater elastic modulus than an elastic modulus of at least one of the rubbers constructing the first layer.

A tire includes a tread rubber which is formed by a plurality kinds of rubber having different elastic modulus, the tread rubber is provided with peripheral joint portions where the plurality kinds of rubber having the different elastic modulus is joined in a tire peripheral direction, and a ground end portion of an outside surface of the tread rubber in a tire width direction is formed by the rubber having the greatest elastic modulus among the plurality kinds of rubber constructing the peripheral joint portions.

A tire with radial carcass reinforcement comprising a crown reinforcement itself capped radially with a tread of which the tread pattern comprises at least two circumferential grooves. The tread is made up of at least three layers, a first layer forming the radially outer part of the tread of a first compound having an electrical resistivity per unit volume .sub.1 such that log(.sub.1) is less than 6, a second layer radially on the inside of at least three parts, at least the axially outer parts of a second compound having an electrical resistivity per unit volume .sub.2 such that log(.sub.2) is greater than 10, and at least part, radially extending the at least first elastomeric compound of the first layer, of a third elastomeric compound having an electrical resistivity per unit volume .sub.3 such that log(.sub.3) is less than 6, a third layer radially furthest towards the inside of at least five parts, at least the axially outer parts of a third elastomeric compound having a maximum value of tan(), denoted tan()max, of less than 0.080, at least two parts of the second compound, and at least part of the third layer, that radially extends the at least one part of the second layer of the third elastomeric compound.

The invention relates to a pneumatic tire comprising a carcass and a tread located radially outward of the carcass and extending between the tire sidewalls; the tread providing a radially outermost tread running surface; the tread comprising a first tread layer comprising a first rubber compound and a second tread layer comprising a second rubber compound; wherein the second tread layer is located radially adjacent to the first tread layer; wherein the first rubber compound is compositionally distinct from the second rubber compound; wherein the second tread layer comprises one or more integrally formed extensions of the second tread layer extending radially outwardly toward the tread running surface; wherein each of the integrally formed extensions of the second tread layer comprises a circumferentially continuous groove and a reinforcement zone disposed on a side of the groove; wherein the first rubber compound comprises 100 parts by weight of at least one diene based elastomer, and from 1 to 150 phr of silica; and the second rubber compound comprises a diene base elastomer, from 50 to 120 phr of a filler, wherein at least 20 phr of the filler is a high surface area carbon black having an iodine adsorption number of at least 100 g/kg, from 1 to 45 phr of a methylene acceptor, from 1 to 25 phr of a methylene donor, and from 1 to 30 phr of at least one additive selected from the group consisting of carbamic resins, liquid diene based polymers having a number average molecular weight ranging from 1000 to 25000, and aromatic hydrocarbon resins.

A pneumatic tire for a motorcycle includes a tread reinforcing cord layer and a tread rubber. The tread rubber includes a base rubber layer and a pair of shoulder rubber layers. The base rubber layer includes a cover portion covering at least the tread reinforcing cord layer over an entire width thereof and a convex portion protruding radially outwardly from the cover portion to form a crown ground contacting surface. The shoulder rubber layers are arranged radially outside the cover portion to form shoulder ground contacting surfaces. The base rubber layer is made of a first rubber composition having larger hardness than the shoulder rubber layers, and the shoulder rubber layers are made of a second rubber composition containing larger amount of oil component than the base rubber layer.