A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.

The invention relates to a rubberized reinforcing ply for articles composed of elastomeric material, preferably for vehicle tires, wherein the reinforcing ply has a multiplicity of strengthening elements which are in parallel and spaced apart, wherein each strengthening element is a cord which is end-twisted from at least two twisted multifilament yarns composed of polyamide 6.6. The raw yarn composed of polyamide 6.6 has a tenacity which, at an elongation of 4%, is within a range from 1.35 cN/dtex to 1.60 cN/dtex, the cord has a tenacity which, at an elongation of 4%, is within a range from 1.2 cN/dtex to 2 cN/dtex and the cord has a thermal shrinkage at 177 within a range of 4.0%-7.0%, wherein the tenacity in accordance with ASTM D885-16 and the thermal shrinkage at 177 C. are determined under a pre-tension of 0.045 g/dtex with an exposure time of two minutes.

A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.

A tire comprising a crown reinforcement formed from at least two working crown layers of reinforcing elements and at least one layer of circumferential reinforcing elements, wherein, the tensile modulus of elasticity at 10% elongation of at least one skim coat of at least one working crown layer is greater than 9 MPa and the maximum value of tan(), denoted tan()max, of said skim coat is less than 0.100.

A tire comprises two working crown layers of reinforcing elements and, in each shoulder, an end of a layer of parallel reinforcing elements oriented circumferentially, said end being axially outside the working crown layers. The reinforcing elements have a diameter less than 1 mm and comprise threads with a diameter strictly greater than 0.16 mm, and, in a radial plane, the ratio between the thicknesses of rubber compound between the inner surface of the tire cavity and that point of a metal reinforcing element of the carcass reinforcement that is closest to said inner surface of the cavity, of the two parts of the tire profile that are centered on the respective orthogonal projections onto the inner surface of the tire cavity of the axially outer ends of said additional layers, and of the parts of the tire profile that have the smallest thicknesses, being greater than 1.15.

A cord of a band of a tire has a single-stranded structure in which steel filaments are stranded, and the number of the filaments is not less than three and not greater than six. In a cross-section of the cord, when represents a diameter of a smallest circle that surrounds cross-sections of the filaments, and represents a diameter of each filament, a gap is formed between the filaments such that the diameter is not less than three times the diameter and not greater than six times the diameter in the case of the number of the filaments being three or four. An initial elongation of the cord is not less than 0.1% and not greater than 1.5%.

A pneumatic tire is disclosed that can improve high-speed durability and shock resistance without increasing the mass of a belt reinforcing layer. The pneumatic tire includes a carcass, a belt on the outer periphery of a crown part of the carcass and a belt reinforcing layer on the outer periphery of the belt, wherein the belt reinforcing layer is provided with a belt reinforcing ply including an organic fiber cord having a double twisting structure obtained by intertwisting two first twisted yarns including a filament bundle of aliphatic polyamide fibers, having nominal fineness of 4000 dtex or less and having tensile toughness (J) per one cord of 5 J or more, and a major diameter direction of the belt reinforcing ply is parallel to a belt outer periphery, and the product of the toughness (J) per one organic fiber cord and cord count (number/25 mm) is 130 to 180.

Technique to increase the endurance of tires comprising two working layers (41, 42), comprising mutually parallel reinforcing elements (411, 421) each forming, with the circumferential direction (XX) of the tire, an oriented angle (AA, AB), such that these respective angles are of opposite sign, the reinforcing elements being comprised of individual metal threads, by combining a manufacturer-recommended direction of rotation (SR) and an optimized design of tread pattern. The tire also comprises axially exterior major grooves (24) in the tread (2) having a mean linear profile L of a width W at least equal to 1 mm and of a depth D at least equal to 5 mm. Different conditions governing the angular orientations of the mean linear profiles L of the axially exterior major grooves (24) apply to the left-hand axially exterior portion (22) and to the right-hand axially exterior portion (23) of the tread (2).

A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.

In a pneumatic tire, a belt layer is formed by laminating a pair of cross belts having a belt angle, as an absolute value, of not less than 10 and not greater than 45 and having belt angles of mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of 5 with respect to the tire circumferential direction. Moreover, the distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10Gsh/Gcc.