Tire comprising major grooves with a depth at least equal to 4 mm and with a width at least equal to 1 mm. The radially outermost working layer (41) comprises at least one undulation (412). The undulation (412) is such that the undulation (412) portion of the working layer (41) represents at least 10% of the surface of the working layer (41), has an amplitude of at least 1 mm and is radially on the outside of the points of the working layer (41) that are in line with the bottom face (243) of the major groove (24) closest (412). All the layers of material (3, 6, 7) making up the radial stack of the crown structure (S) have mean surfaces parallel to that of the radially outermost working layer (41).

When (I) a tyre 1 is in contact with a flat surface (S) with a camber angle of 40 degrees, (II) a load (F) applied to the tyre is increased from zero, and (III) a curve (T) is obtained by plotting, in a XY coordinate, a displacement (x) in a tyre axial direction and a displacement (y) in a tyre radial direction of a position (A) of one of tyre tread edges (Te) closer to the flat surface (S), the displacements being from a reference position (A0) when the load (F) is zero, inclination of the curve (T) increases as the load (F) increases at least in a range where the load (F) is not more than 78% of a maximum load capacity load of the tyre.

A tire is provided having a body ply that is displaced from the conventional equilibrium curve along the shoulder and upper side wall region of the tire in a manner that provides more uniform inflation growth along the crown region so as to reduce differences in rigidity between the center and shoulders of the tire, reduce load sensitivity, and/or decrease the propensity for cracking. A method for designing or constructing such a tire is also provided.

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. One terminal of a carcass layer extends to a ground contact edge of a tread portion positioned on an opposite side with respect to a tire center line as a reference. The carcass layer has a double layer structure including an inner layer positioned inward in a tire radial direction in a tread region and an outer layer positioned outward in the tire radial direction of the inner layer in the tread region. A cord angle in the carcass layer in a tread central region with respect to a tire circumferential direction is different from a cord angle in at least one of the inner layer and the outer layer of the carcass layer in a side region with respect to the tire circumferential direction.

A pneumatic tire includes a tread portion, a pair of sidewall portions, a pair of bead cores, a carcass layer, a pair of first bead apex rubber components, and a belt layer disposed outward of the carcass layer. In an unloaded condition where the tire is mounted onto a standard rim and inflated with an internal pressure at 50 kPa, the carcass layer has a profile that includes an outer side portion extending from a position (A) where the carcass layer separates from the belt layer to a maximum width position (B) of the carcass layer, and the pair of outer side portion is located outside a virtual arc (C0) having a single radius (R0) of curvature passing through the position (A), the maximum width position (B), and an outermost ends in the tire radial direction of one of the pair of first bead apex rubber components.

Provided is a pneumatic tire. Both terminals of a carcass layer are overlapped with each other in a tread region. The carcass layer has a triple layer structure including an inner layer positioned most inward in a tire radial direction in the tread region, an outer layer positioned most outward in the tire radial direction in the tread region, and an intermediate layer positioned between the inner layer and the outer layer in the tread region. A cord angle in the carcass layer in a tread central region with respect to a tire circumferential direction differs in at least one of the inner layer, the outer layer, and the intermediate layer from a cord angle in the carcass layer in a side region with respect to the tire circumferential direction.

A pneumatic tire includes a carcass includes at least one carcass ply of cords extending between bead cores of bead portions through a tread portion and sidewall portions, wherein both ends of the carcass ply are turned up around the respective bead cores, and a pair of bead apex rubbers each extending radially outwardly to a radially outer end from a radially inner surface that is connected to the respective bead cores. In a tire meridian cross-section under a standard inflated state, in each of the bead portions, an angle of a bead reference line that passes an axially center point of the inner surface of the bead apex rubber and the radially outer end of the bead apex rubber is in a range of from 28 to 35 degrees with respect to a tire radial line.

A tire, wherein, in a cross section in the tire width direction thereof in a state where the tire has substantially not been inflated with no load applied thereon, provided that the maximum height in the tire radial direction of the carcass is h, a radius of curvature of the carcass within a height range 0.91 h-h measured from the radially innermost position of the carcass is R7, an acute inclination angle specifically defined in the height range 0.91 h-h is 7, the intermediate value of a radius of curvature in the height range 0.82 h-0.91 h is R6, a radius of curvature in the height range 0.63 h-0.82 h is R5, and an acute inclination angle specifically defined in the height range 0.63 h-0.82 h is 5, R70.26h, 714, R6<R7, R5>R6, and 523.

The invention relates to a pneumatic vehicle tire, in particular a utility vehicle tire, having a tread with a circumferential groove, and having a carcass with a carcass ply which has, in a cross section of the tire, a carcass ply line running through the central points of the strength members of the carcass ply, wherein said cross section is the cross section in the circumferential direction U that the tire would have in the new state if it were mounted on a standard wheel rim conforming to E.T.R.T.O. without filling pressure.