A pneumatic tire having a carcass and a belt reinforcing structure, the belt reinforcing structure comprising: a zigzag belt reinforcing structure formed of a strip of one or more reinforcement cords, the strip of one or more reinforcement cords being inclined at 5 to 30 degrees relative to the centerplane of the tire extending in alternation to turnaround points at each lateral edge, wherein the zigzag strip of cords is formed from two different reinforcement cords made of different materials, and a low angle belt of the tire has a higher EPI than the zigzag belt.

A pneumatic tire comprises a belt layer disposed in the tread portion. The average cord angle θn and average cord count Nn of the belt layer are constant or gradually increases or decreases from a center position to shoulder positions. The ratio θns/θnc of the average cord angle θns at the shoulder positions to the average cord angle θnc at the center position is 1.30 or less. The ratio Nns/Nnc of the average cord count Nns at the shoulder positions to the average cord count Nnc in the center position is 0.77 or more.

Provided is a pneumatic tire. A chamfered portion and a non-chamfered portion are provided in each of an edge on a leading side and an edge on a trailing side of a sipe. In a meridian cross-sectional view, a profile line of a rib projects further to an outer side in a tire radial direction than a reference tread profile line. A radius of curvature TR of the reference tread profile line and a radius of curvature RR of the profile line satisfy a relationship of TR>RR. The chamfered portions on both the leading side and the trailing side are disposed so as to straddle a maximum projection position. A maximum projection amount D of the rib with respect to the reference tread profile line and a maximum width W of the chamfered portion satisfy a relationship of 0.05 mm.sup.2<W×D<1.50 mm.sup.2.

An outermost end of a carcass folded-up portion is located in a tire width direction inside than an end in the tire width direction of the outermost inclined belt layer, in the tire radial direction between a carcass main body portion and the innermost inclined belt layer. A carcass cord in the folded-up portion located on the outermost side of the tire and a belt cord of the outermost inclined belt layer cross each other to be inclined in the same direction in a tire circumferential direction as being from one side toward the other side in the tire width direction, a difference in inclination angle is 30° or less, a width of the outermost inclined belt layer is larger than that of the innermost inclined belt layer, and in-plane rigidity per unit width of the innermost inclined belt layer is higher than that of the outermost inclined belt layer.

A pneumatic tire includes a carcass layer and belt layers including belt cords inclined with respect to a circumferential direction, the belt cords of different layers being arranged in a criss-cross manner. In at least one belt layer, an inclination angle α of the belt cords with respect to the circumferential direction at a center position and an inclination angle β of the belt cords with respect to the circumferential direction at a belt end position satisfy 15°≤β<α≤35°. A maximum ground contact length L1 and a ground contact length L2 satisfy 0.8≤L2/L1≤1.0, where L1 is the maximum ground contact length in the circumferential direction, W1 is a maximum ground contact width in a radial direction, and L2 is the ground contact length in the circumferential direction at a position 40% of W1 from the center position outward in a lateral direction.

The pneumatic tire includes a carcass layer, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread rubber disposed on an outer side of the belt layer in the radial direction. Additionally, the carcass layer has a cord angle of 80° or more and 100° or less. Additionally, the belt layer is formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt. Additionally, the first reinforcing belt has a cord angle of 11° or more and 30° or less, the second reinforcing belt has a cord angle of 1° or more and 11° or less, and the auxiliary belt has a cord angle of 55° or more and 70° or less.

A tire includes a carcass ply, a tread disposed radially outward of a crown region of the carcass ply, and a belt structure having an overall axial width substantially equal to a tread width interposed between the tread and the crown region in circumferential surrounding relation to the carcass ply. The belt structure includes a first belt layer and a second belt layer radially adjacent the first belt layer. The first belt layer includes a first reinforced composite with first reinforcement cords embedded in a first rubber matrix. The first reinforcement cords have a construction of 1100/4 dtex with a twist between 150 TPM and 250 TPM and a dipping tension between 100 mN/tex and 200 mN/tex.

A tyre includes a tread portion being provided with a pair of shoulder circumferential grooves on an outer surface thereof and a tread reinforcing layer disposed in the tread portion. The tread reinforcing layer includes a circumferential belt layer having a plurality of first reinforcing cords oriented along a tyre circumferential direction. The circumferential belt layer includes a pair of axially spaced first circumferential belt plies extending in radially inner regions of the pair of shoulder circumferential grooves. The pair of first circumferential belt plies is arranged apart from one another at a distance L equal to or more than 20 mm in a tyre axial direction.

A pneumatic tire is provided. A bead filler is disposed on an outer circumferential side of each bead core in bead portions, a side reinforcing layer having a crescent-shaped cross-section is disposed on an inner side in a tire width direction of a carcass layer in a sidewall portion, and as physical properties of a rubber that constitutes the side reinforcing layer and a rubber that constitutes the bead filler, a modulus at 100% elongation is in a range from 8.4 MPa to 10.2 MPa, a tan δ at 60° C. is in a range from 0.04 to 0.08, and JIS hardness at 20° C. is in the range from 75 to 79.

A multi-strand cord (50) comprises an internal layer (CI) of the cord made up of K=1 two-layer (C1, C3) internal strand (TI), with the internal layer (C1) being made up of Q internal metallic threads (F1), and the external layer (C3) being made up of N external metallic threads (F3), and an external layer (CE) of the cord made up of L>1 two-layer (C1′, C3′) external strands (TE) wound around the internal layer (CI) of the cord, with the internal layer (C1′) being made up of Q′ internal metallic threads (F1′), and the external layer (C3′) being made up of N′ external metallic threads (F3′). The cord (50) has an endurance criterion SL≤40 000 MPa.Math.mm with

[00001]$SL=\max \left(\frac{\Delta {\sigma }_{\mathrm{bending\_CI}}}{\mathrm{Cp}};\frac{\Delta {\sigma }_{\mathrm{bending\_CE}}}{C_r\times \mathrm{Cp}}\right)$

and a size criterion Ec≥0.46 with Ec=Sc/Se.