Provided is a pneumatic tire for preventing the occurrence of premature wear at tire width direction edge portions due to the use of an endless inclined belt. The pneumatic tire includes two or more layers of inclined belts formed by winding rubber strips S each composed of a plurality of paralleled and rubber coated cords in a direction inclined with respect to the tire circumferential direction while folding back the rubber strips at both width direction ends. Rubber members G are arranged between the rubber strips S layered at the tire width direction edge portions of the inclined belts.

Tire comprising a crown reinforcement formed of three working layers having between ends thereof two layers of rubber compound Ci. Thickness of the three working layers is <5 mm with individual metal wires as reinforcing elements of diameter <0.50 mm and a distance therebetween being strictly <1 mm. The axial width of each working layer is >60% that of the tread. Distance d.sub.i between two working layers separated by a layer of rubber compound Ci and measured at the end of the axially narrowest working layer in contact therewith is such that 0.5<d.sub.i<2.5 mm, and, in a meridian plane, the thickness of at least one layer of rubber compound Ci is substantially constant over the axial width between the axially inner end of a layer of rubber compound Ci and the end of the axially narrowest working layer in contact therewith.

A tire for a heavy-duty vehicle of construction plant type comprises a crown reinforcement (35) radially on the inside of a tread (10) and radially on the outside of a carcass reinforcement (50). The crown reinforcement (35) comprises: at least one low-modulus layer (20) formed of elastic metal reinforcers having a structural elongation at least equal to 0.4%, and a total elongation at break at least equal to 3%, and a tensile elastic modulus of between 40 GPa and 130 GPa; at least one rigid layer (30) formed of rigid metal reinforcers, the structural elongation of which is less than or equal to 0.2% and the tensile elastic modulus of which is between 140 GPa and 200 GPa. The ratio of the breaking tension of the rigid layer to that of the low-modulus layer is greater than or equal to 1.2.

A pneumatic tire includes at least three circumferential main grooves extending in the tire circumferential direction, and a plurality of land portions partitioned by the circumferential main grooves. 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 mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of 5 with respect to a tire circumferential direction. Also, when viewed as a cross-section from the tire meridian direction, when the wear end surface of the circumferential main grooves is drawn, 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 De/Dcc0.94.

A motorcycle tire comprises a tread reinforcement including a jointless band ply. The jointless band ply has a developed width Wa of not more than 65% of the developed tread width TWe. The tread portion has a tread profile comprising a crown arc portion having a radius R1 of curvature and a pair of shoulder arc portions having a radius R2 of curvature. The radius R1 is smaller than the radius R2 and smaller than 50% of the maximum tire cross-section width Wt. In a normal state of the tire, the axial ends of the crown arc portion are respectively positioned axially inward of the outer edges of the jointless band ply.

A pair of annular inserts of elastomeric material is circumferentially applied by spiraling around a laying surface of an auxiliary drum. Then a plurality of strip-like elements disposed in parallel side by side relationship with each other in the circumferential extension of the laying surface is applied onto the auxiliary drum, so as to form at least one first belt layer. Respectively opposite end portions of each strip-like element are radially superposed, each against one of the annular inserts, so that each of the annular inserts projects from a respective end edge of the strip-like element. The cap structure formed on the auxiliary drum is coupled to a carcass structure through toroidal conformation of the latter, in such a manner that the radially external ends of sidewall portions previously manufactured on the carcass plies are associated with the axially external ends of the annular inserts.

Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements, crossed from one layer to the other making with the circumferential direction angles comprised between 10 and 45. A first layer S of polymer compound is in contact with at least one working crown layer and in contact with the carcass reinforcement, the said first layer S of polymer compound extending axially as far as at least the axial end of the tread 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.

The invention relates to a tire comprising a crown reinforcement formed of at least two working crown layers each 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.

In accordance with the invention, the elastic modulus under tension at 10% elongation of at least one skim layer of at least one working crown layer is less than 8.5 MPa, the maximum value of tan(), denoted tan()max of the said at least one skim layer of at least one working crown layer is less than 0.100, and the complex dynamic shear modulus G*, measured at 10% and 60 C. on the return cycle, of the said first layer S of polymer compound is greater than 1.35 MPa.

Tire comprising a crown reinforcement formed of two working crown layers having unequal axial widths, layer C of rubber compound between ends of the working crown layers, layer S of polymer compound in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising a layer of circumferential reinforcing elements arranged radially between two working crown layers. Distance d between the end of the axially narrowest working layer and the working layer separated from the axially narrowest working layer by the layer C is 1.1<d<2.2, being the diameter of the reinforcing elements of the layer of circumferential reinforcing elements, in a meridian plane. The thickness of layer C is substantially constant and the complex dynamic shear modulus G*, measured at 10% and 60 C. on the return cycle, of layer S is greater than 1.35 MPa.

Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements, a first layer C of rubber compound being placed between at least the ends of the said at least two working crown layers, a second 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 first layer C is less than 8 MPa, the maximum tan() value, denoted tan().sub.max, of the first 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 said second layer S of polymer compound is greater than 1.35 MPa.