A body ply skim layer in which a reinforcing ply is embedded, arranged at a distance T from an outer surface of the body ply skim layer and at a distance B from an inner surface of the body ply skim layer, such as to define an asymmetry index AT equal to 100×(T−B/T+B). The asymmetry index AT is greater than −100 and less than 0.

A body portion and a part of a folded portion of a carcass of a pneumatic tire are formed by a plurality of plies. The pneumatic tire is provided with a flipper folded from the inside in the tire width direction to the outside in the tire width direction via a bead core to cover the bead core and a bead filler, and an insert is provided between the bead filler and a flipper folded to the outside in the tire width direction. In at least a part of the region where the insert is provided, the thickness and the thickness of a side rubber are substantially the same as the ply thickness obtained by combining the body portion and the folded portion.

A tire for a civil engineering vehicle the endurance of which has been improved by the addition of an anti-creep layer (30) with a thickness E2 interposed between the airtight inner layer (20), with a thickness E1, and the reinforcer coating layer (46) of the carcass reinforcement (40), with a thickness E3. The thicknesses E1, E2 and E3, being measured in millimetres in a shoulder region forming the transition between the crown and each sidewall of the tire, satisfy the following equations: 2≤E1≤4; 6≤E2+E3 and E1/E2≥0.6. In addition, the viscoelastic loss P60 of the elastomeric mixture M2 of the anti-creep layer (30) is at most equal to 20%.

A pneumatic tire comprises a carcass ply extending between bead portions through a tread portion and sidewall portions, and turned up around a bead core from the inside to the outside of the tire in each of the bead portions, so as to form a pair of turnup portions and a main portion therebetween. In each the bead portion, a first apex rubber and a second apex rubber are disposed. The first apex rubber is disposed between the turnup portion and the main portion. The second apex rubber is disposed axially outside the turnup portion. A complex elastic modulus b of the second apex rubber is larger than that of the first apex rubber. The cross-sectional width wt in mm of the tire and the outer diameter Dt in mm of the tire satisfy the following conditions Dt=<59.078×wt.sup.0.498 and Dt>=59.078×wt.sup.0.460.

A tire includes a pair of axially spaced apart annular bead cores, a carcass ply extending around both bead cores, a tread for engaging a contact surface and being disposed radially outward of the carcass ply, and a belt structure disposed radially between the carcass ply and the tread. The carcass ply includes a plurality of cords embedded in a polymer matrix. The carcass ply has a first radially upper surface and a second radially lower surface disposed opposite the first surface. The first surface defines first portions and second portions interspaced between each first portion. Each first portion has a thickness greater than each second portion thereby forming throated portions between each cord of the plurality of cords.

Provided is a heavy-duty pneumatic tire in which not only occurrence of a damage of CBU but also occurrence of pulling-out of a carcass ply can be inhibited, and which has excellent durability. In the tire, beads each include a cover enclosing at least a part of a core. The cover is located, between the core and the carcass ply, in a portion at which the carcass ply encloses the core. The cover is composed of one cover ply including a large number of aligned cover cords and a cover topping rubber covering the cover cords. A ratio of a distance between the cover cords to an outer diameter of a carcass cord is not lower than 0.35 and not higher than 0.85. A difference between a hardness of the cover topping rubber and a hardness of a carcass topping rubber is not less than 5 and not greater than 5.

A pneumatic tire includes a tread portion, a pair of sidewall portions, and a pair of bead portions. A carcass layer is mounted between the bead portions, and the carcass layer is turned up from a tire inner side to a tire outer side about a bead core of each of the pair of bead portions. A tread radius in a meridian cross-section of the tread portion is in a range of from 600 mm to 1700 mm, a ground contact width of the tread portion is in a range of from 60% to 90% of a tire cross-sectional width, and a height of a bead filler is equal to or less than 30% of a tire cross-sectional height.

A tire for motorcycles includes a toroidal carcass and a band layer. Carcass plies are overlapped so that carcass cords cross each other. The carcass plies include at least one turned up ply including a main body portion and a turned up portion. The carcass cords of the main body portion are arranged at angles of 20 degrees or more and 70 degrees or less with respect to a tire equator, and the carcass cords of the turned up portion are arranged at angles different from the carcass cords of the main body portion. The band layer includes a jointless band ply in which band cords are spirally arranged at angles of 5 degrees or less with respect to a tire circumferential direction.

To provide a pneumatic tire with which a magnitude of a lateral force can be adjusted without changing the structure of a tread portion. In a pneumatic tire, an outer profile shape of the pneumatic tire is formed in left and right symmetry with respect to a tire equator, and a thickness of the pneumatic tire from an outer surface to an inner surface is set in left and right asymmetry with respect to the tire equator.

Provided is a pneumatic tire which prevents accumulation of static electricity during travelling, which inhibits the tire from rising in an electric resistance with the passage of time, and which is reduced in a rolling resistance of the tire and excellent in durability thereof. In the pneumatic tire described above, a conductive rubber is arranged for a ply coating rubber of one surface, and a non-conductive rubber is arranged for the ply coating rubber of the other surface; assuming that the respective thicknesses thereof are T1 and T2, a carcass ply has a ply in which T1/T2 satisfies 0.2T1/T20.9; and the conductive ply coating rubber is arranged at a tread side, and the non-conductive ply coating rubber is arranged at an inner liner side.