A pneumatic tire comprising a tread (25), a belt structure (40, 50, 60, 70, 80) and a carcass (31) is disclosed. The belt structure comprises a zigzag belt structure (60) and a contrasting colored wear indicator structure (50) located either radially inward of the zigzag belt structure (60) or radially outward of the zigzag belt structure (60) and between the zigzag belt structure (60) and a belt layer (80).

This invention provides a pneumatic tire having its weight reduced without degrading the durability of bead portions.

Provided is a pneumatic tire comprising, as a framework, at least one carcass ply comprising a steel cord covered with rubber. Letting d (mm) be the cord diameter of the steel cord and T (MPa) be the tensile strength of a steel filament forming the steel cord, the following relation is satisfied: $${\mathrm{a}}_{\mathrm{1}}\mathrm{T}-{\mathrm{b}}_{\mathrm{1}}>\mathrm{d}>{\mathrm{a}}_{\mathrm{2}}\mathrm{T}+{\mathrm{b}}_{\mathrm{2}}$$ (where a₁ is 3.65 × 10^-4 mm/MPa, b₁ is 0.42 mm, a₂ is -8.00 × 10^-5 mm/MPa, and b₂ is 0.78 mm), and the tensile strength T of the steel filament is 3000 MPa (exclusive) to 4000 MPa (exclusive) and the number of hits E under a bead core of the steel cord in the carcass ply is 12 hits/25 mm (exclusive) to 38 hits/25 mm (exclusive).

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: a reinforcing cord of a carcass ply is composed of a polyester fiber and/or an aramid fiber, and subjected to an adhesive agent treatment in which an adhesive agent containing at least one of a thermoplastic polymer, a heat reactive aqueous urethane resin, and an epoxide compound is used for a first bath, an RFL-based adhesive agent is used for a second bath, and a principal chain of the thermoplastic polymer substantially fails to include a double bond between carbons having an addition reactivity, is composed of an ethylene addition polymer and/or a urethane-based high molecular weight polymer, each of which is composed mostly of a linear chain structure, and includes a cross-linkable functional group as a pendant group.

A bead reinforcement element (54, 56) such as a flipper or chipper for use in a pneumatic tire (10) is disclosed. The bead reinforcement element (54, 56) comprises at least one hybrid or composite cord (130) having at least one first core yarn (132) with at least one second aramid wrap yarn (134) wrapped around the first core yarn (132), the first core yarn (132) having a Young's modulus lower than the Young's modulus of the second aramid wrap yarn (134).

Provided is a run-flat tire in which the ride quality and the run-flat durability during normal running are highly combined.

The tire is provided with a reinforcing cord layer covering the radial carcass at least from the belt end to the maximum width portion of the tire side portion; the cord constituting the reinforcing cord layer is nylon 66 cord, cellulose fiber cord, PET cord, PEN cord or aramid/nylon 66 hybrid cord, and has a cord angle of less than 10° with respect to the tire radius direction; and

the elastic modulus of the cord pulled out from the tire at a temperature of 25°C under the conditions of a load of 3 N is not higher than 40 cN/dtex, and the thermal shrinkage stress σ (cN/dtex) at a temperature of 177°C and the elastic modulus E (cN/dtex) at a temperature of 177°C under the conditions of a load of 10 N satisfy the following conditions: σ + 0.025E ≥ 0.36,40 ≥ E ≥ 8, and σ≥ 0.05

A pneumatic tire comprising a carcass reinforced by a carcass ply (14) extending from a first bead to a second bead (28a, 28b) and a belt structure (101) being disposed radially outward of the carcass ply (14) in a crown portion of the pneumatic tire (10) is disclosed. The belt structure (101) has a first belt portion or layer (18) and a second portion comprising a plurality of bands (16), wherein the first portion or layer (18) extends axially from a first shoulder portion of the crown portion of the tire (10) to a second shoulder portion of the crown portion of the tire (10) or extends axially between a first shoulder portion of the crown portion of the tire (10) and a second shoulder portion of the crown portion of the tire (10) over at least 50% of the section width of the tire (10), preferably in a range of from 70% to 95% of the section width of the tire (10). Each band (16) of the plurality of bands (16) has an axial width less than the axial width of the first belt portion or layer (18) or wherein each band (16) of the plurality of band (16) has an axial width in a range of from 5% to 25% of the section width of the tire (10). At least one band (16) of the plurality of bands (16) includes a first group of cords or filaments oriented in a first direction relative to the direction of the centerline (CL) of the pneumatic tire (10) and a second group of cords or filaments oriented in a second direction different from the first direction relative to the direction of the centerline (CL) of the pneumatic tire (10).