A tire having a jointless cut protector belt, wherein the jointless cut protector belt is continuously wound using a strip of one or more reinforcement cords, wherein the strip of one or more reinforcement cords is wavy, extending primarily in the circumferential direction, and preferably wound in a sine wave pattern.

A pneumatic tire comprising a carcass 12, at least one inclined belt layer 13, at least one first circumferential cord layer 14 arranged inward in the tire radial direction of the inclined belt layer 13, a tread 16 arranged outward in the tire radial direction of the inclined belt layer 13, and a second circumferential cord layer 15 which is arranged outward in the tire radial direction so as to cover a tire width direction end of the inclined belt layer 13, and where X is defined as X=Y×n×m×d, Y is the Young's modulus (GPa) of the cord, n is the number of cords implanted (cords/50 mm), d is the cord diameter (mm), and m is the number of the first circumferential cord layers 14, X is smaller than X of the first circumferential cord layer 14.

On a tread of the pneumatic tire, circumferential grooves extending along the tire circumferential direction are formed. The spiral belt has a reinforcing cord wound in the tire circumferential direction. The tensile elongation at break of the reinforcing cord is 10 cN/dtex or more, and the elongation at break of the reinforcing cord is 13% or less. The spiral belt is formed by winding a cord unit, in which a plurality of reinforcing cords are arranged along the tire width direction, around the tire circumferential direction. The width of the cord unit in the tire width direction is narrower than the width GW of the circumferential groove in the tire width direction.

A pneumatic tire includes a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the bead portions through the tread portion and the sidewall portions, a belt layer disposed radially outwardly of the carcass, a band layer disposed radially outwardly of the belt layer, and a pair of belt-edge rubbers disposed between the belt layer and the band layer to cover axially outer edges of the belt layer. The band layer includes a full band and a pair of edge bands covering the axially outer edges of the belt layer. The pair of edge bands includes one or more organic fiber cords each having restraining force in a range from 5 to 35 N at radially outward locations of the outer edges of the belt layer.

A tire comprises a tread portion provided with a band composed of at least one band cord wound spirally and circumferentially of the tire and embedded in the tread portion. When a band cord piece is taken out from the above-said at least one band cord embedded in the tread portion and measured for the length, a length Lb is equal to or smaller than a length La at least in a part of the tread portion, where the length Lb is measured at a first point of time after the band cord piece has been taken out, and the length La is measured at a second point of time after the first point of time.

A rubber composition has an improved rolling resistance and is based on at least a diene elastomer comprising mainly at least one isoprene elastomer; a reinforcing filler comprising from 15 to 70 phr of carbon black having a BET specific surface area of less than 70 m.sup.2/g, and/or a COAN of less than 90 ml/100 g, and from 5 to 20 phr of silica; a salt of an alkaline-earth, alkali or lanthanide metal; and a crosslinking system; in which composition the carbon black to silica ratio is greater than 1.

A pneumatic tire includes: a belt layer in which a belt cord is arranged; and a belt reinforcing layer in which an organic fiber cord is arranged, the belt reinforcing layer is formed by coating the organic fiber cord with rubber, and a ratio (Sr/Sc) of a rubber cross-sectional area (Sr) to a cord cross-sectional area (Sc) is 1.0 to 1.5, and a value obtained by dividing, by 1000, a sum of a product (A) of a load LASE5% (N) at 5% elongation of the organic fiber cord, a cord count (per 25 mm), and the number of belt reinforcing layers, and a product (B) of a load (N) at 0.5% elongation of the belt cord, cos θ in which a belt angle is defined as θ, a cord count (per inch), and the number of belt layers is 8.7 or more.

A pneumatic tire comprises a carcass layer, a belt layer disposed on the outer side in the tire radial direction of the carcass layer, and tread rubber disposed on the outer side in the tire radial direction of the belt layer. The belt layer is formed by laminating a pair of cross belts having belt angles with an absolute value from 10° to 45° both inclusive and mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° relative to the tire circumferential direction. 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 1.10≤Gsh/Gcc. The groove depth (Dsh) and under-groove gauge (UDsh) of the outermost circumferential main groove have a relationship satisfying 0.20≤UDsh/Dsh.

A tire (10) for two-wheeled vehicles comprises a crown (12) comprising: a tread (20), and a hoop reinforcement (17) comprising at least one hooping ply (19) comprising one or more hoop reinforcing elements (44) comprising an assembly made up of a multifilament strand of aromatic polyamide or aromatic copolyamide (47) and of a multifilament strand of aliphatic polyamide (48). The twist factor K of the hoop reinforcing element (44) ranges from 5.5 to 6.5. The tire (10) is obtained by a method comprising a step of manufacturing the hooping ply (19), in which the bonded reinforcing elements (44) are embedded in a polymer composition in order to form the uncured hooping ply, the equivalent initial tensile modulus of the uncured hooping ply ranging from 330 to 620 cN/tex/dm.

A pneumatic tire is provided with a belt layer and a reinforcing layer provided outside the belt layer in tire radial direction. The reinforcing layer has an inner reinforcing layer in which a strip member having a plurality of cords is wound along tire circumferential direction, and an outer reinforcing layer in which the strip member having a plurality of cords is wound along the tire circumferential direction and is provided outside tire radial direction of the inner reinforcing layer. The outer reinforcing layer has a gap between adjacent strip members in tire width direction.