A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions. The carcass includes a carcass ply which includes a main portion and a turn-up portion turned up around a bead core of each bead portion. A belt layer is disposed radially outward of the carcass in the tread portion, wherein a radially outer end of the turn-up portion is located between the main portion and the belt layer in the tread portion. A sheeted rubber layer is disposed between the main portion and the turn-up portions in each sidewall portion.

A tire comprising a crown reinforcement formed of at least two working crown layers each one formed of reinforcing elements inserted between two skim layers of rubber compound, a first layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of the layer C is greater than 9 MPa, the maximum value of tan(), denoted tan()max, of the layer C is less than 0.100 and the complex dynamic shear modulus G*, measured at 10% and 60 C. on the return cycle, of the first layer S of polymer compound is greater than 1.35 MPa.

A pneumatic tire for heavy loads comprising a bead core, a bead filler arranged on the outside in a tire radial direction of the lead core, a steel cord-containing carcass ply wound up on the outside from the inside in a fire axis direction around the bead core, a steel cord-containing chafer provided so as to cover the carcass ply from the inside in the tire radial direction, and a reinforcing sheet comprising a rubber and a cotton kneaded therein and interposed between the bead core and the carcass ply. The tire can improve durability of a bead part.

A pneumatic tire is provided with at least three circumferential main grooves extending in the circumferential direction of the tire and a plurality of land portions defined by the circumferential main grooves. Additionally, the belt layer is formed by layering a pair of cross belts having a belt angle, as an absolute value, of no less than 10? and no more than 45? and having a belt angles of mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ?5? with respect to a circumferential direction of the tire. A tire ground contact width (Wg) and a carcass cross-sectional width (Wca) of a carcass layer have a relationship such that 0.64?Wg/Wca?0.84.

The pneumatic tire includes at least three circumferential main grooves extending in the tire circumferential direction and a plurality of land portions partitioned and formed by the circumferential main grooves. Also, the 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 more than 45 and 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. Also, when viewed as a cross-section from the tire meridian direction, the distance Dcc on the tire equatorial plane from the circumferential reinforcing layer to the wear end surface and the distance De from the end portion of the circumferential reinforcing layer to the wear end surface have a relationship such that 1.06De/Dcc.

A method of building a tire carcass is disclosed. The method of building the tire carcass includes the steps of applying one or more tire building components onto a drum forming a cylindrically shaped tire carcass. Placing a first and second bead onto the tire building components on the drum so that the tire carcass ends of the tire carcass extend laterally between the beads. Radially expanding a first and second bead lock mechanism into engagement with a respective first and second bead. Inflating the carcass under low pressure into engagement with a belt and tread package while moving the beads axially inward. Moving the beads axially inward to the axial width of the widest breaker position; Turning up the outer lateral ends of the cylindrically shaped tire carcass about a respective first and second bead.

A pneumatic tire includes cross belts and one or more protective belts provided in the tire radial direction. A width of a widest protective belt is greater than a width of any of the cross belts. In the tire profile, a maximum projection position of the widest protective belt is A, an end position of the widest protective belt is B, a position at which a straight line a passing through position A extending in the direction normal to a tread surface intersects with the tread surface is A, and a position at which a straight line b passing through position B extending in the direction normal to the tread surface intersects with the tread surface is B. An angle formed between a first straight line that links position A and position B and a second straight line that links position A and position B is from 0? to 15?.

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.

A tire includes a circumferential tread disposed in a crown region of the tire and an undertread disposed below the circumferential tread. The tire also has a pair of bead regions, including a first bead region and a second bead region, and a body ply extending from the first bead region to the second bead region. The tire further has a pair of sidewalls, including a first sidewall extending between the first bead region and the circumferential tread and a second sidewall extending between the second bead region and the circumferential tread. The tire also has a sidewall antenna adjacent to the first sidewall. The sidewall antenna has a first end contacting the undertread and a second end contacting the body ply.

A pneumatic tire comprises: a carcass layer, a belt layer, and a tread rubber. The belt layer is formed by laminating a pair of cross belts having a belt angle of not less than 10 and not more than 45 in absolute terms and 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. A distance (Gcc) from a tread profile to a tire inner circumference surface along a tire equatorial plane, a distance (Gsh) from a tread end to the tire inner circumference surface, and a distance (Ge) from the tread profile to the tire inner circumference surface at an end portion on the outer side of the circumferential reinforcing layer in the tire width direction have relationships satisfying 1.10Gsh/Gcc and 1.00Ge/Gcc1.10.