A radial tire includes a pair of bead cores, a carcass having one or a plurality of carcass plies extending from one of the bead cores to the other of the bead cores in a toroidal form, a tread portion circumferentially encircling the toroidal form of the carcass, and a belt structure disposed radially between the carcass and the tread portion having a main belt layer, a first, unreinforced rubber layer disposed on a radially outer side of the main belt layer, a second, unreinforced rubber layer disposed within the main belt layer, and a protective belt layer disposed on a radially outer side of the first, unreinforced rubber layer and a radially inner side of the tread portion. A radially outermost layer of the main belt layer has a plurality of reinforcement cords each having a diameter, and the first and second, unreinforced rubber layers have first and second radial thicknesses, respectively, relative to such diameter.

A pneumatic tire 2 includes a buttress reinforcing layer 22. A carcass 12 includes a first ply 38 and a second ply 40. The first ply 38 and the second ply 40 each have a main portion that is extended on and between beads 10 on both sides. The buttress reinforcing layer 22 extends along the first ply 38 and the second ply 40 between the first ply 38 and the second ply 40. An outer end 22a of the buttress reinforcing layer 22 is disposed inward of a shoulder region S of a tread 4 in a radial direction. An inner end 22b of the buttress reinforcing layer 22 is disposed at a maximum width position of the tire or disposed outward of the maximum width position of the tire in the radial direction.

The invention relates to a bicycle tyre. A puncture-resistant fibre layer (4) having a plurality of polymer, parallel running tyre reinforcing elements (12) is arranged between the tyre tread (2) and the tyre carcass. Said reinforcing elements (12) are arranged at an angle of between approximately 80 and 110 degrees with respect to the peripheral direction (13) of the bicycle tyre.

The invention relates to a bicycle tyre with high riding comfort. A damping rubber insert (3) made from a highly elastic rubber is arranged between the tyre tread (2) and the tyre carcass. Said damping rubber insert (3) has a material thickness of between 0.2 and 2 mm, and the carcass insert ends (10) extend to a maximum of the lateral edge areas of the tyre tread (2).

A tire having a crown reinforcement formed of at least two working crown layers having unequal axial widths, a layer C of rubber mixture being positioned between at least the ends of the said at least two working crown layers, and the crown reinforcement having at least one layer of circumferential reinforcing elements positioned radially between two working crown layers. The 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 of rubber mixture is such that 1.1<d<2.2, being the diameter of the reinforcing elements of the said at least one layer of circumferential reinforcing elements, and, in a meridian plane, the thickness of the layer C of rubber mixture is substantially uniform.

Provided is a steel cord for reinforcing rubber articles which, when applied to a belt of a tire, can attain lightweight without reducing the durability of the tire, and in particular, to a steel cord for reinforcing rubber articles in which the properties of a treat after rubberizing are excellent and a pneumatic radial tire using the same. Also provided is a steel cord for reinforcing rubber articles comprising a core formed by arranging two core filaments 1 in parallel without being twisted together, and N (2N4) sheath filaments 2 which are twisted together around the core. Letting the diameter of the core filament 1 be d1, and the diameter of the sheath filament 2 be d2, d1>d2.

The present invention relates to a tire cord having excellent durability while being thin in thickness, a manufacturing method thereof and a tire comprising the same.

A method of manufacturing a pneumatic tire comprising a belt which is wound with a belt-under diameter D outside a carcass ply in a tire-radial direction, includes preparing a strip-like rubber-coated cord member where a plurality of belt cords which are arranged approximately parallel are coated with rubber and a width of the cord member in a lateral direction is D sin . The cord member is cut at the cord angle with respect to a longitudinal direction to cut out a belt forming member having a parallelogram which includes circumferential direction sides extending in a tire circumferential direction in a wound state and formed as cut portions and inclined sides extending parallel to the belt cord and defined as both side portions of the cord member. The belt forming member is wound into a circular cylindrical shape and joined the inclined sides which face each other to each other.

A method of manufacturing a pneumatic tire includes preparing a belt forming member formed of belt cords arranged parallel and covered with rubber. In a development state, the belt forming member is formed into a parallelogram, so that in a state wound with the belt cords extending in a direction inclined at a cord angle , the belt forming member is formed into a circular cylindrical configuration where a belt-under diameter D is not smaller than 940 mm and not larger than 960 mm and a belt width W is not smaller than 270 mm and not larger than 310 mm, and the cord angle , the belt-under diameter D and the belt width W satisfy a relationship of 0.577 DW/tan<1.07D. The belt forming member is wound and joined at a joint portion where the inclined sides are brought into contact with each other.

A pneumatic tire of the present disclosure includes an endless belt with a rubber coated cord, formed by coating a belt cord with rubber, extending in a zigzag manner in the tire circumferential direction. In a developed view of the endless belt, an intersection formed by the belt cord intersecting at two bent portions, adjacent in the tire circumferential direction, of the rubber coated cord is designated as T, and a length L in the tire circumferential direction between two intersections T adjacent in the tire circumferential direction, a width W of the belt cord, and an inclination angle 1 of the belt cord relative to the tire circumferential direction at inclined extending portions of the rubber coated cord satisfy the relationships 5<110, and L<(3 W/tan(12)), or 10<145, and L<(3 W/tan(15)).