A tire includes a tread portion including a ground contact surface, a first rubber layer made of a first cap rubber forming part of the ground contact surface, a second rubber layer made of a second cap rubber disposed radially inwardly of the first rubber layer, and at least one groove portion opening to the ground contact surface. The first cap rubber has a loss tangent tan δ1, and the second cap rubber has a loss tangent tan δ2 greater than the loss tangent tan δ1. The groove portion includes a first indicator in which a bottom of the groove portion locally raises, the first indicator having an outer surface in a tire radial direction. The radially outer surface of the first indicator substantially coincides with a first wear line that is parallel to the ground contact surface and passes through a radially outer surface of the second rubber layer.

A pneumatic tire comprises a carcass layer, a belt layer disposed on an outer side of the carcass layer in a tire radial direction, and a tread rubber disposed on the outer side of the belt layer in the tire radial direction. The belt layer formed by laminating an angle belt having a belt angle ≥45° and ≤70° in absolute values, a pair of cross belts, having belt angles of ≥10° and ≤45° in absolute values and having belt angles of mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to a tire circumferential direction. A tread width TW and a cross-sectional width Wca of the carcass layer have a relationship such that 0.82≤TW/Wca≤0.92. A width Ws of the circumferential reinforcing layer and a cross-sectional width Wca of the carcass layer such that 0.60≤Ws/Wca≤0.70.

Provided is a motorcycle tire, that provides excellent steering stability while using steel cords as a belt layer material, which comprises a carcass extending from a tread portion to a bead core of a bead portion via a sidewall portion, and a belt layer arranged outside the carcass and inside the tread portion in the tire radial direction, wherein the belt layer is a steel belt layer having steel cords; the steel cord is a steel cord having an m×n configuration in which n strands, formed by twisting m steel filaments, are twisted together in the same direction as the steel filaments, and the m is 1 or more and 3 or less and n is 2 or more and 6 or less; the diameter of the steel filament is 0.15 mm or more and 0.25 mm or less; the rubber composition forming the tread portion is a rubber composition having a complex elastic modulus E* (MPa) of 5.0 MPa or more; and the product (S×E*) of the total cross-sectional area S(mm.sup.2) of the steel filaments in the cross section of the steel cord and the complex elastic modulus E* (MPa) is 2.00 or less.

A run-flat tire includes: sipes formed in blocks; a belt reinforcing layer on an outer side in a radial direction of a belt layer; and a side reinforcing rubber in sidewall portions, wherein a density of the sipes in a center block is from 0.10 cords/mm or greater to 0.30 cords/mm or smaller, the belt reinforcing layer includes a center reinforcing portion in which more center reinforcing portions are stacked at a center region than at positions other than the center region, a width Wc of the center reinforcing portion is within 0.5 Gr≤Wc≤2.5 Gr with respect to a thickness Gr of the side reinforcing rubber at the tire maximum width position, and an average width of the width Wc of the center reinforcing portion is from 50% or greater to 90% or smaller of a width of the center block.

A styrenic block copolymer is disclosed, having a formula, A-B-A, A-B-B-A, (A-B-A).sub.nX, (A-B).sub.nX or mixtures thereof, wherein n is from 2 to 30, and X is residue of a coupling agent. Each A block is independently a polystyrene having 10-63 wt. % 1,1-diphenylethylene, a GPC peak molecular weight from about 5-40 kg/mol, and forms 10-40 wt. % of the copolymer. Each B block is independently a poly(1,3-diene-co-styrene) comprising: (i) >90 wt. % of polymerized isoprene units relative to the weight of the polymerized 1,3-diene, where S is <40, and (S+V) is 18-75; (ii) >90 wt. % of polymerized butadiene units relative to the weight of the polymerized 1,3-diene, where S is <40, and (1.2*S+V) is 60-120; or combinations thereof “S” represents the polystyrene content, and “V” represents the 1,3-diene content having pendant 1,2- and/or 3,4-vinyl groups in the B block.

Passenger vehicle tire, the tread having edge parts (11), provided with a plurality of transversely or obliquely oriented cuts (3) having a width at most equal to 2 mm and a depth at least equal to 75% of the thickness of the tread that is intended to be worn away, more than half of the cuts (3) comprising a protuberance that locally reduces the width of the cut (3) to a width at least equal to 0.2 mm and at most equal to 0.5 mm. The tread material which comes into contact with the road surface in the new state has a Shore A hardness at least equal to 48 and at most equal to 57, a loss at 60° C. at least equal to 12% and at most equal to 20%, a glass transition temperature Tg at least equal to −20° C. and at most equal to −10° C.

The invention relates to a sulfur-crosslinkable rubber mixture comprising a rubber blend composed of at least one solution-polymerized diene polymer A of high molecular weight and at least one solution-polymerized polymer B of low molecular weight, wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups, and a vulcanization system comprising at least one accelerator and elemental sulfur and/or at least one sulfur donor substance, where the molar ratio of accelerated sulfur is 0.18 to 5, where the total molar amount of sulfur consists of elemental sulfur and the sulfur released by the sulfur donor substances.

A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

In a pneumatic tire are defined: a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread, a second imaginary line VL2 passing through a bottom of a shoulder groove and parallel to VL1, an intersection point P between VL2 and a surface of a shoulder land outward of a ground contact edge T in a lateral direction, and an equatorial plane CL. Given A as a distance in the lateral direction between P and CL, B as a groove depth of the shoulder groove, and C as a distance in the lateral direction between T and CL, 0.80≤(B+C)/A≤1.15 is satisfied. Given Q as a distance in the lateral direction between CL and an end of a belt ply that has a shorter dimension in the lateral direction, 0.75≤Q/C≤0.95 is satisfied.

A rubber composition for a tire is obtained by blending from 80 to 100 parts by mass of an inorganic filler and from 0.5 to 5 parts by mass of an alkylsilane having an alkyl group with from 3 to 20 carbons in 100 parts by mass of a diene rubber including from 20 to 45% by mass of a natural rubber, from 20 to 45% by mass of a styrene-butadiene rubber, and from 20 to 45% by mass of a butadiene rubber that add up to a total of 100% by mass, in which rubber hardness at 23° C. is 68 or more.