The present invention provides a run-flat tire excellent in run-flat durability. In the run-flat tire, a vulcanized rubber of a rubber composition containing a rubber component and a vulcanization accelerator that contains tetrabenzylthiuramdisulfide is used for at least one member selected from the group consisting of a side-reinforcing rubber layer and a bead filler. In the vulcanized rubber of the run-flat tire, a proportion of monosulfide bonds and disulfide bonds in all sulfide bonds is 65% or more.

A run-flat tire is provided with: a carcass layer mounted between a pair of bead portions; and a run-flat reinforcing layer having a crescent-shaped cross-section, provided on a side wall portion on an inner side of the carcass layer in a tire width direction, a band-like sound absorbing member that extends in a tire circumferential direction adhering to a region of a tire inner surface corresponding to a tread portion, wherein the band-like sound absorbing member is locally arranged in at least one shoulder region within the region corresponding to the tread portion.

A tire includes a carcass ply and a belt structure disposed radially outward of the carcass ply in a crown portion of the tire. The belt structure includes a first belt ply, a second belt ply radially adjacent the first belt ply, an overlay ply radially adjacent the first belt ply, a first wrap around strip encompassing both axial edges of the first belt ply, and a second wrap around strip encompassing both axial edges of the second belt ply. The overlay ply may have an axial width less than both a maximum axial width of the first belt ply and a maximum axial width of the second belt ply.

Provided is a pneumatic tire having both improved run-flat durability and excellent wet grip properties; the pneumatic tire including a rubber composition used in a tread part, and a rubber support layer having a gauge thickness in a specified range; the rubber composition including specified compounded amounts of natural rubber, a terminal-modified styrene-butadiene rubber, silica, and a thermoplastic resin, wherein the rubber composition is largely strain-dependent for the storage elastic modulus.

The present invention provides a run-flat tire excellent in high-temperature softening inhibition, and a rubber composition from which the tire can be produced. The rubber composition contains a rubber component, a filler, a vulcanizing agent, and a vulcanization accelerator that contains a sulfenamide-based vulcanization accelerator and 1.0 to 2.0 parts by mass of tetrabenzylthiuramdisulfide based on 100 parts by mass of the rubber component, in which a mass ratio (a/b) of a content (a) of the tetrabenzylthiuramdisulfide to a content (b) of the sulfenamide-based vulcanization accelerator is 0.60 to 1.25.

Provided is a run flat tire comprising a side reinforcing layer on a sidewall part, wherein a rubber composition of the side reinforcing layer has a complex elastic modulus at 100° C. (E*.sub.100) of 5.0 to 17 MPa and a loss tangent at 60° C. (60° C. tan δ) of 0.020 to 0.100 MPa, and wherein, where a tire cross-sectional width is defined as Wt (mm) and a tire outer diameter is defined as Dt (mm), Wt and Dt satisfy any of the following inequality (1), (2), and (3):

Wt<225 and Dt≥59.078×Wt{circumflex over ( )}0.460  (1)

225≤Wt<235 and Dt≥59.078×Wt{circumflex over ( )}0.620−967.673  (2)

235≤Wt and Dt≥Wt{circumflex over ( )}0.6+750  (3)

A run-flat tire includes side reinforcing rubbers provided along tire width direction inner side surfaces of carcass side portions. A first inner liner is provided along a tire radial direction inner side surface of a carcass central portion and tire width direction inner side surfaces of the side reinforcing rubber. Both end portions of the first inner liner run along a contour in a cross-section along a tire rotational axis direction and are respectively formed further toward a tire radial direction outer side than tire radial direction inner side end portions of the side reinforcing rubber. A second inner liner extends along a surface, which is at a side opposite from the carcass central portion, of the first inner liner. Both end portions of the second inner liner are respectively formed further toward a tire radial direction inner side than the both end portions of the first inner liner, along a contour in a cross-section along the tire rotational axis direction.

A bead portion of a run-flat tire includes a bead core portion having a bead cord, a first bead filler portion continuous to the bead core portion and provided outside in the tire radial direction of the bead core portion, and a second bead filler portion provided outside in the tire width direction of the first bead filler portion via a carcass ply. The second bead filler portion is formed of a resin material.

A pneumatic tire has a side wall having a side surface and dimples formed on the side surface. The side surface has the tire maximum width point, the dimples are aligned along circumferential rows in concentric form with respect to the tire axis such that the dimples form lateral ribs and longitudinal ribs, the lateral ribs each have radially outer side surface and radially inner side surface and include first and second ribs, the first rib is formed such that the height from the dimple bottom at the inner side surface and the height from the dimple bottom at the outer side surface are equal, the second rib is formed such that the height from the dimple bottom at the inner side surface is greater than the height from the dimple bottom at the outer side surface, and the second rib is positioned radially inward from the maximum width point.

A run flat tire having improved run flat durability is provided. The run flat tire has a side wall part reinforced by a side reinforcing rubber part, and the side reinforcing rubber part is formed by a rubber composition which comprises 100 parts by mass of a diene rubber containing natural rubber and polybutadiene rubber, and from 0.1 to 4.0 parts by mass of a mercaptobenzimidazole compound.