Abstract: The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition comprising a rubber component containing 20% by mass or more of a modified conjugated diene based polymer, satisfying Expression (1) in terms of the elongation X under a stress of 6.5 MPa at 180° C. and the elongation Y under a stress of 6.5 MPa at 25° C. after vulcanization. 1.00?X/Y?1.

Abstract: The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition having a tensile stress at 50% elongation at 180° C. (M50) of 6.2 MPa or more as a vulcanized rubber physical property.

Abstract: The present invention provides: a rubber composition prepared by mixing 60 to 100 parts by mass of a filler (B), 0.9 to 2.4 parts by mass of a phenol resin (C), 0.07 to 0.2 parts by mass of a methylene donor (D), 1.5 to 2.1 parts by mass of a thiuram based vulcanization accelerating agent (E), and 3.2 to 4.5 parts by mass of a sulfenamide based vulcanization accelerating agent (F), based on 100 parts by mass of the rubber component comprising 20 to 80% by mass of a modified conjugated diene based polymer (A), allowing the ride comfort in normal running to be satisfied in parallel with improvement in the run flat durability (durability in run flat running); and a tire comprising at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using the rubber composition.

Abstract: The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition comprising a rubber component containing 20% by mass or more of a modified conjugated diene based polymer, satisfying Expression (1) in terms of the elongation X under a stress of 6.5 MPa at 180° C. and the elongation Y under a stress of 6.5 MPa at 25° C. after vulcanization. 1.00?X/Y?1.

Abstract: The present invention provides: a rubber composition prepared by mixing 60 to 100 parts by mass of a filler (B), 0.9 to 2.4 parts by mass of a phenol resin (C), 0.07 to 0.2 parts by mass of a methylene donor (D), 1.5 to 2.1 parts by mass of a thiuram based vulcanization accelerating agent (E), and 3.2 to 4.5 parts by mass of a sulfenamide based vulcanization accelerating agent (F), based on 100 parts by mass of the rubber component comprising 20 to 80% by mass of a modified conjugated diene based polymer (A), allowing the ride comfort in normal running to be satisfied in parallel with improvement in the run flat durability (durability in run flat running); and a tire comprising at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using the rubber composition.

Abstract: The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition having a tensile stress at 50% elongation at 180° C. (M50) of 6.2 MPa or more as a vulcanized rubber physical property.

Abstract: Provided is a pneumatic tire in which a cord including an aramid fiber is used for a reinforcing cord for a carcass ply, and the cut resistance, the steering stability, and the light-weightness are improved. Provided is a pneumatic tire 10 including a carcass 4 composed of at least one carcass ply as a skeleton, and a reinforcing cord of the carcass ply includes an aramid fiber, and the upper twist coefficient T represented by the following formula: T=N×?{(0.125×D/2)/?}×10?3 (in the formula, N represents the twist count (count/10 cm) of the cord, D represents the total fineness of the cord, and ? represents the density of the cord) is 0.5 or higher, the total fineness is 1,800 dtex or lower, and the end count of the reinforcing cord in the carcass ply is 55 counts/5 cm or larger.

Abstract: Provided is a pneumatic safety tire in which the durability is improved by improving the compression fatigue property of a carcass ply cord. The pneumatic safety tire includes, as a skeleton, a carcass, and a side reinforcing rubber. Provided that the area of the side reinforcing rubber is S1, the area of a bead filler is S2, and the area of a rubber chafer is S3, the following expressions (1) and (2) are satisfied: 0.10?(S2+S3)/S1?2.50??(1) 0?S2/(S2+S3)?0.

Abstract: Provided is a steel cord for reinforcing rubber articles which has both rubber penetration and productivity and which allows to reduce the weight of a tire without compromising the strength of the tire when applied to a tire, and a pneumatic tire using the same. The steel cord for reinforcing rubber articles of the present invention is a steel cord for reinforcing rubber articles comprising a core formed by arranging two core filaments in parallel without twisting the filaments together, and six sheath filaments twisted around the core. Letting the diameter of the core filament dc (mm), the diameter of the sheath filament ds (mm) and sheath filament twist pitch p (mm), an average sheath filament interval D represented by the following Formula (I): D=[L?6ds{1+(L/p)2}1/2]/6??(I), (where L=(?+2)dc+?ds) is from 25 to 80 ?m.

Abstract: Provided is a steel cord for reinforcing rubber articles which has both rubber penetration and productivity and which allows to reduce the weight of a tire without compromising the strength of the tire when applied to a tire, and a pneumatic tire using the same. The steel cord for reinforcing rubber articles of the present invention is a steel cord for reinforcing rubber articles comprising a core formed by arranging two core filaments in parallel without twisting the filaments together, and six sheath filaments twisted around the core. Letting the diameter of the core filament dc (mm), the diameter of the sheath filament ds (mm) and sheath filament twist pitch p (mm), an average sheath filament interval D represented by the following Formula (I): D=[L?6ds{1+(L/p)2}1/2]/6??(I), (where L=(?+2)dc+?ds) is from 25 to 80 ?m.

Abstract: Provided is a pneumatic tire for heavy loads in which durability and a desired rigidity in circumferential direction are simultaneously attained while achieving a reduction in the tire weight. The present invention is a pneumatic tire for heavy loads having at least one layer of steel belt in which a plurality of steel cords 1, each of which is constituted by a plurality of intertwisted filaments 11, are arranged in parallel in the form of bundles. In the pneumatic tire for heavy loads, the height of cord bundles 2, that is, the minor axis (A) (mm) of the steel cords 1 and the bundle width (B) (mm), satisfy the relationship represented by the following Formula (1): B/A?2.0??(1), and at the same time, the value of S=B/(B+D), which is defined by the bundle width (B) (mm) of the cord bundles 2 and the distance (D) (mm) between the cord bundles, satisfies the relationship represented by the following Formula (2): 0.60?S?0.80??(2).