The tire has a load index that is at least 118 and two layers of reinforcing elements. Each of the layers has a breaking force per unit width that is higher than 2900 daN/dm. A minimum strength per unit width, measured for an elongation of less than 10%, of the second layer is greater than 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of the first layer. The reinforcing elements of the first layer have a thread count that is higher than 300 tex. The reinforcing elements of the two layers have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer are greater than 8% under a force of 20 daN and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj1.

The present invention provides a pneumatic tire having excellent durability. Provided is a pneumatic tire including at least one steel belt layer, at least one cap ply layer, and at least one carcass layer, the steel belt layer including a steel belt topping rubber composition which has a zinc oxide content of 8.0 parts by mass or more per 100 parts by mass of the rubber component, the cap ply layer including a cap ply topping rubber composition, the carcass layer including a carcass topping rubber composition, the cap ply topping rubber composition and the carcass topping rubber composition both having stearic acid and zinc oxide contents, each per 100 parts by mass of the rubber component, which satisfy the following relationships (1) and (2):

stearic acid content3.0 parts by mass,(1):

stearic acid content/zinc oxide content0.5.(2):

A pneumatic tire includes a reinforcing rubber layer disposed in the sidewall portions, the reinforcing rubber layer having a crescent-like meridian cross-section. When the tire is assembled on a regular rim and in an unloaded state with an internal pressure of 0 kPa, a radius of curvature (RP) is smaller than a radius of curvature (RO), an arc of the radius of curvature (RP) joining an intersection (Pa) of a carcass layer and a straight line (La), an intersection (Pb) of the carcass layer and a straight line (Lb), and an intersection (Pc) of the carcass layer and a straight line (Lc), and an arc of the radius of curvature (RO) joining an intersection (Oa) of the straight line (La) and a tire external contour, an intersection (Ob) of the straight line (Lb) and the tire external contour, and an intersection (Oc) of the straight line (Lc) and the tire external contour.

Provided is a pneumatic tire ensuring conductivity while being reduced in weight, and having good fuel efficiency and handling stability. The tire includes a sidewall and a carcass, the sidewall including a laminate of two or more rubber layers including an inner sidewall layer (1) located closest to the carcass, and an outer sidewall layer (2) constituting an outer surface of the tire; the layer (1) including a rubber composition for (1); the layer (2) including a rubber composition for (2); the carcass including a carcass cord topped with a rubber composition for a carcass cord topping (3); the sidewall having a thickness of 3.0 mm or less; the layer (1) having a thickness of 0.2-1.0 mm; the composition for (1) having a volume resistivity of 5.010.sup.7 .Math.cm or less; the compositions for (1) and for (2), and the compositions for (3) and for (1) satisfying specific relations.

A tire includes a pair of bead cores, a carcass layer extended across the bead cores, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread portion. A tire outer diameter OD (mm) is in a range 200OD660. A total tire width SW (mm) is in a range 100SW400. A groove area ratio Aa of the tread portion is in a range 0.008Aa/OD0.150.

A tire includes a pair of bead cores, a carcass layer extended across the bead cores, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread portion. A tire outer diameter OD (mm) is in a range 200OD660. A total tire width SW (mm) is in a range 100SW400. A groove area ratio Aa of the tread portion is in a range 0.008Aa/OD0.150. A groove area ratio Ace of a center region of the tread portion and a groove area ratio Ash of a shoulder region of the tread portion have a relationship Ace/Ash>1.

The invention relates to a method for manufacturing a studded pneumatic tire, the method comprising steps of producing an annular carcass by providing a first ply material comprising first cords), wherein the first cords comprise aramid, aramid content of the first cords being at least 50 wt. % of total weight of the first cords, winding at least a layer of the first ply material onto a carcass drum, thereby forming a cylindrical carcass preform, arranging two cables to the cylindrical carcass preform, and expanding the preform, thereby forming the annular carcass, forming a preassembly of belts and a tread, arranging the preassembly of belts and a tread onto the annular carcass to form a preform, vulcanizing the preform, and installing studs. The invention further relates to a studded pneumatic tire.

A tire having a radial carcass reinforcement, composed of at least one layer of metal reinforcing elements, the said tire comprising a crown reinforcement, itself topped radially by a tread, the said tread being joined to two beads via two sidewalls. The metal reinforcing elements of at least one layer of the carcass reinforcement are cords exhibiting, in the permeability test, a flow rate of less than 20 cm.sup.3/min and at least one layer of the carcass reinforcement is provided, on at least one face, with textile threads exhibiting, in the permeability test, a flow rate of between 1 and 3 cm.sup.3/min.

A pneumatic tire including: a cylindrical annular structure; a rubber layer, which will become a tread portion, provided along a circumferential direction of the annular structure on an outer side of the annular structure; a carcass portion provided on at least both sides in a width direction of the cylindrical structure including the annular structure and the rubber layer; and an extending portion that extends from both sides in the width direction of the annular structure farther outward in the width direction than a ground contact edge on the outer side in the width direction of the tread portion, and that is provided in plurality on both sides in the width direction along the circumferential direction of the annular structure.

A tire having a radial carcass reinforcement, made up of a single layer of reinforcing elements anchored in each of the beads by being turned up around a bead wire, reinforced by a stiffener. The two working crown layers are the only ones present to form the crown reinforcement over at least 75% of the width of the tread, the absolute value of the difference between the absolute values of the angles 2 and 1 being greater than 8, 2 being greater than 1 in terms of absolute value, the mean angle satisfying the relationship 13+131*exp(L/100)<<20+164*exp(L/100), the reinforcing elements of the carcass reinforcement being cords which, in the test referred to as the permeability test, yield a flow rate of less than 20 cm.sup.3/min, a rubber compound being present within the cords, and, in the sidewall of the tire, the profile of the outer surface of the tire is at a constant distance from the carcass reinforcement layer between the points F and A, and meets the outer surface of the bead at the point C, forming two successive circular arcs.