Abstract: A pneumatic tire 1 according to the present invention includes a plurality of turbulence generation ridges 13 which extend on a surface of a tire side portion 7 in a tire-radial direction and which are arranged at a pitch in a tire-circumferential direction. A protrusion 15 rising from the surface 7a of the tire side portion 7 is formed in the tire side portion 7. Either an inner end portion 13A of the turbulence generation ridge 13 or an outer end portion 13B of turbulence generation ridge 13 is smoothly continuous to a surface of the protrusion 15. An inner end height (H1), which is a height of the inner end portion 13A from the surface 7a of the tire side portion 7, is larger than an outer end height (H2), which is a height of the outer end portion 13B from the surface 7a of the tire side portion 7.

Abstract: The present invention includes a run-flat tire 1 comprising a plurality of turbulence generation ridges 20 which extend on a surface of a tire side portion 3 in a tire-radial direction and which are arranged at a pitch in a tire-circumferential direction and relationship Si>So is satisfied. Si is the sum of sidewall areas of all the turbulence generation ridges located at the inner side, in the tire-radial direction, of a maximum width position of the pneumatic tire. So is the sum of sidewall areas of all the turbulence generation ridges located at the outer side, in the tire-radial direction, of the tire maximum width position.

Abstract: A pneumatic tire has a tread pattern wherein a circumferential groove continuously extending in a circumferential direction is formed in at least a first half part of a treading face within a range of 10-30% of a treading face width from an end of the treading face and a plurality of curvedly slant grooves extending from the circumferential groove toward a side of a central part of the treading face so as to make an angle at an acute angle side with respect to the circumferential direction gradually small away from the circumferential groove are arranged at intervals in the circumferential direction, in which a land row consisting of tapered land portions defined between the circumferentially adjoining curvedly slant grooves and having a width gradually decreased toward the side of the central part of the treading face is formed in the treading face, and sipes linearly extending at two large and small inclination angles with respect to the circumferential direction without crossing with each other are alterna

Abstract: The object of the present invention is to provide a tire having a mark consisting of a character string capable of improving a readability of the character string without decreasing a visibility of the mark. A sidewall of the tire is configured such that at least one mark has a property that an inner envelope curve 13 in a tire radial direction has an arc-like shape convex outwardly in the tire radial direction, and a radius of curvature r1 of the arc is greater than a distance r0 from a center of rotation O0 of the tire to a point on the arc closest to the center of rotation O0 of the tire.

Abstract: A pneumatic tire sufficiently enhances the frequency dispersion effect for the columnar resonance noise due to the presence of the circumferential grooves, per se, or the lowering effect for the sound pressure level, in association with the cross-sectional area of the lateral grooves. The tire has a tread surface provided with a plurality of circumferential grooves (2, 4) extending continuously in a circumferential direction. The circumferential grooves (2, 4) are each provided with a plurality of lateral grooves (7, 8) each having one end opened into that circumferential groove and the other end terminating in a land portion (7, 8), independently from other circumferential grooves, other lateral grooves opening into said other circumferential grooves or in a ground contacting end of a tread.

Abstract: A pneumatic tire having improved wet performance without sacrificing steering stability. A pair of central circumferential main grooves 14 and a pair of side circumferential main grooves 16 are arranged on a tread 12, to obtain a fundamentally high level of wet performance. A plurality of central land portion row lateral grooves 20 is formed at both sides of a central land portion row 18 to be spaced away from each other substantially at a constant distance, to enhance wet performance. Central land portion row chamfer portions 24 are formed at obtuse angle portions of the central land portion row 18. The central land portion row chamfer portions 24 drain water between a tread surface and a ground-contact surface into the respective central circumferential main grooves 14 adjacent thereto, whereby wet draining performance is enhanced.

Abstract: To provide a pneumatic tire for a motorcycle in which both wear resistance and wet steering stability can be attained. Since a pair of zigzag circumferential direction grooves 28 are positioned at the center of a tread central region 24C and has an amplitude, even when a certain camber angle is exceeded, an occurrence of a sudden separation of the zigzag circumferential direction groove 28 from a road-contact surface 26 can be prevented, whereby deterioration of wet steering stability can be suppressed. When the camber angle increases, water in a road-contact surface 26 is drained by inclining grooves 32 which are arranged at an external side of the zigzag circumferential direction groove 28. Since sharp inclining groove portions 32A of the inclining grooves 32 are positioned in the tread central region 24C, and no lug groove components are employed, circumferential direction rigidities of land portions in the tread central region 24C are high and exhibits excellent wear resistance.

Abstract: A pneumatic tire is provided, which readily achieves rain groove wandering resistance without sacrificing wet performance and other performances. Plural steep-angle grooves 16 are provided at opposite sides of the tire equatorial plane CL. Each steep-angle groove 16 is inclined at an angle of not more than 45 degrees relative to the tire circumferential direction, such that the steep-angle groove 16 contacts the ground from a tire equatorial plane CL side. Recessed portions 36 are formed along a tread surface side edge of a land portion adjacent to an inner side in a tire axial direction of the steep-angle transverse groove 16. A depth of the recessed portion 36 gradually increases and a width thereof gradually decreases along a middle portion in a longitudinal directional toward end portion at the tire equatorial plane CL of the steep-angle transverse groove 16.

Abstract: A pneumatic tire has a tread pattern wherein a circumferential groove continuously extending in a circumferential direction is formed in at least a first half part of a treading face within a range of 10-30% of a treading face width from an end of the treading face and a plurality of curvedly slant grooves extending from the circumferential groove toward a side of a central part of the treading face so as to make an angle at an acute angle side with respect to the circumferential direction gradually small away from the circumferential groove are arranged at intervals in the circumferential direction, in which a land row consisting of tapered land portions defined between the circumferentially adjoining curvedly slant grooves and having a width gradually decreased toward the side of the central part of the treading face is formed in the treading face, and sipes linearly extending at two large and small inclination angles with respect to the circumferential direction without crossing with each other are alterna

Abstract: To provide a pneumatic tire capable of improving wet performance without sacrificing steering stability. Since a pair of central circumferential main grooves 14 and a pair of side circumferential main grooves 16 are arranged on a tread 12, a fundamentally high level of wet performance can be obtained. Since a plurality of central land portion row lateral grooves 20 is formed at both sides of a central land portion row 18 to be spaced away from each other substantially at a constant distance, wet performance is further enhanced. Further, since central land portion row chamfer portions 24 are formed at obtuse angle portions of the central land portion row 18, the central land portion row chamfer portions 24 drain water between a tread surface and a ground-contact surface into the respective central circumferential main grooves 14 adjacent thereto, whereby wet draining performance is enhanced.

Abstract: To provide a pneumatic tire for a motorcycle in which both wear resistance and wet steering stability can be attained. Since a pair of zigzag circumferential direction grooves 28 are positioned at the center of a tread central region 24C and has an amplitude, even when a certain camber angle is exceeded, an occurrence of a sudden separation of the zigzag circumferential direction groove 28 from a road-contact surface 26 can be prevented, whereby deterioration of wet steering stability can be suppressed. When the camber angle increases, water in a road-contact surface 26 is drained by inclining grooves 32 which are arranged at an external side of the zigzag circumferential direction groove 28. Since sharp inclining groove portions 32A of the inclining grooves 32 are positioned in the tread central region 24C, and no lug groove components are employed, circumferential direction rigidities of land portions in the tread central region 24C are high and exhibits excellent wear resistance.