To provide a tire that is not only improved in durability, steering stability, and low rolling resistance in high-speed driving but also excellent in tire productivity. A tire including a pair of bead cores (11), a carcass including at least one carcass ply (12) extending between the pair of bead cores (11), a belt (13) including at least one belt layer placed outward in a tire radial direction of the carcass, and at least one belt reinforcement layer (14) placed outward in a tire radial direction of the belt (13), in which a reinforcement cord of at least one of the carcass ply (12) and the belt reinforcement layer (14) includes a cord using a polyamide multifilament including a polycondensate of a dicarboxylic acid including an aromatic dicarboxylic acid with a diamine.

Provided is an elastomer reinforcement cord with improved rust resistance. An elastomer reinforcement cord 10 includes metal filaments and a polymer material. The elastomer reinforcement cord 10 has a multi-strand structure which includes: at least one core strand 21 formed by twisting plural metal filaments 1a and 1b together; and two or more sheath strands 22 each formed by twisting plural metal filaments 11a and 11b together, the sheath strands being twisted together around the core strand. An intra-sheath-strand filling rate a, which is a ratio of the area of the polymer material with respect to an intra-sheath-strand gap region A, is 52% or higher, and an inter-strand filling rate b, which is a ratio of the area of the polymer material with respect to an inter-strand gap region B, is 75% or higher.

A passenger vehicle tire having rolling resistance without negatively affecting the grip and behaviour. The tread (2) has a radial height H.sub.S between 5 mm and 8 mm, a volumetric void ratio T.sub.EV between 22% and 30%, a total volume V.sub.CP of the main voids (241) at least equal to 80% of the total volume V.sub.C of the voids (24), and comprises an elastomeric compound having a glass transition temperature T.sub.g between 22° C. and 5° C., a Shore A hardness between 45 and 65, and a dynamic loss tgδ at 23° C. at least equal to 0.13 and at most equal to 0.39. The metal reinforcers of the working layers (41, 42) are steel monofilaments having a cross section S with a smallest dimension Dmin between 0.20 mm and 0.50 mm. The monofilaments distributed at a density d.sub.T between 100 threads/dm 200 threads/dm, each working layer (41, 42) having a mean radial thickness E.sub.T between D+0.1 mm and D+0.6 mm.

A composite cord is composed of two first strands formed of aramid fibers and one second strand formed of nylon fibers. In a cross section perpendicular to a length direction, a ratio L2/L0 of a length L2 of an exposed surface of the second strand along the outer cord periphery to a length L0 of an exposed surface of the composite cord along the outer cord periphery is in a range of 0.30 or more and 0.40 or less.

According to the present disclosure, there is disclosed a hybrid tire cord capable of realizing high performance and weight reduction of a tire by having strong adhesion to rubber and excellent fatigue resistance as well as high tenacity and high modulus by providing a cabled yarn in which an aramid hybrid Z-twisted yarn composed of an aramid multifilament yarn and an aramid spun yarn; and a general-purpose Z-twisted yarn are S-twisted together. There is also provided a method for manufacturing the same.

In a pneumatic tire according to an embodiment, a belt layer is configured such that the angle of a belt cord relative to the tire circumferential direction is more than 30° and 40° or less. An organic fiber cord of a belt-reinforcing layer, which is placed on the radially outer side of the belt layer, is configured such that when the number of twists per 10 cm length is T (twists/10 cm), the fineness is D (dtex), and the fiber density is ρ (g/cm.sup.3), the twist coefficient K defined as T×(D/ρ).sup.1/2 is 900 to 2,600, and the product of the load at 5% elongation LASE 5% (N) of the organic fiber cord and the end count E (cords/25 mm) of the organic fiber cord is 1,000 N or more.

A tire includes a carcass ply, a tread disposed radially outward of a crown region of the carcass ply, 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, and a fabric layer including a single flat monofilament wrapped with one or more multifilament cords, the monofilament being nylon, the multifilaments being a material consisting from the group of aramid, glass, and carbon.

A tyre for vehicle wheels comprises a support structure and a tread band arranged in a radially outer position with respect to the support structure. The support structure comprises a plurality of hybrid reinforcing cords (10) each having a plurality of monofilament textile wires (20) twisted to at least one multifilament textile yarn (30). In any cross section of the hybrid reinforcing cord (10), at least one portion of at least one monofilament textile wire (20) of said plurality of monofilament textile wires (20) defines a first radially outer surface portion of the hybrid reinforcing cord (10) and at least one portion of said at least one multifilament textile yarn (30) defines a second radially outer surface portion of the hybrid reinforcing cord (10).

In a pneumatic tire, a tread average thickness A in a tire width direction region of a center land portion where a center cover layer is disposed, a tread average thickness B in a tire width direction region of the center land portion where the center cover layer is not disposed, and a tread average thickness C in tire width direction regions where second land portions located further on an outer side than the center land portion in a tire width direction and adjacent to the center land portion are defined and formed satisfy a relationship A<B<C.

A tyre for vehicle wheels comprises a carcass structure including at least one carcass ply having a plurality of hybrid reinforcing cords (10). Each hybrid reinforcing cord (10) comprises at least two strands (20a, 20b) twisted together with a predetermined twisting pitch (P). Each of said at least two strands (20a, 20b) comprises at least one monofilament textile wire made of polyester fibres and at least one multifilament textile yarn (22a, 22b) comprising a plurality of textile filaments (23a, 23b) made of aramid and/or polyester and/or rayon fibres. In any cross section of the hybrid reinforcing cord (10), said at least one monofilament textile wire is at least partially embedded in the filaments (23a, 23b) of said at least one multifilament textile yarn (22a, 22b).