Abstract: A pneumatic tire in which: a carcass layer is laid between paired bead sections; a belt layer is buried, on the outer peripheral side of the carcass layer, in a tread section; and multiple main grooves extending in a tire circumferential direction are provided in the tread section. In the pneumatic tire, a maximum groove depth of each of the main grooves is 8.5 mm to 15.0 mm, a ratio ? of a section height SH of an actual tire to a section height SHstd calculated from a tire size is set in a range of 0.97???0.99, a contact area ratio is 65% to 70% under a measurement condition where an air pressure is 200 kPa and a load is 50% of a load carrying ability with the air pressure of 200 kPa, and an average contact pressure P is 300 kPa to 400 kPa under the measurement condition. The tire achieves enhanced wet performance without increasing tire weight.

Abstract: A pneumatic radial tire having a structure where the lapel edge of the carcass is tucked under a belt layer and exhibiting high durability and steering stability can be easily produced using a carcass material of an existing size without preparing an ultra-wide carcass material. Two layers of carcasses (A, B) are extended from a tread portion (1) to a bead portion (3) via right and left sidewall portions (2), and the opposite ends thereof are turned down from the inside of the tire to the outside around right and left bead cores (4, 4). A belt layer (6) is arranged on the outer circumferential side of the carcasses (A, B) and the overall width of the carcasses (A, B) in the tire width direction is essentially equal and the carcasses (A, B) are offset in opposite directions in the tire width direction.

Abstract: A pneumatic tire is configured such that: paired first main grooves extending in a tire circumferential direction are provided on the two sides of a tire equator line in a tread portion, respectively; a distance between a center position of each first main groove and the tire equator line is set at 8% to 20% of a ground contact width W; a first land portion is defined between these first main grooves; multiple sub-grooves each having a curved shape are formed in each of both edge portions of the first land portion at intervals in the tire circumferential direction; one end of each sub-groove is opened to the corresponding first main groove, and the other end of the sub-groove is terminated inside the first land portion; a rib portion continuously extending in the tire circumferential direction is formed in an area of the first land portion on the tire equator line; and a relation between a length (L) of a center line of each sub-groove and a pitch length (P) of the sub-grooves in the tire circumferential dire

Abstract: Provided is a pneumatic tire which achieves both of excellent wet traction and wear resistance from an early stage to an advanced stage of wear. Multiple dent parts are formed, at certain intervals in a tire circumferential direction, in both side walls of each of at least two land portions of multiple land portions being formed in a tread surface and extending in the tire circumferential direction. Each of the dent parts has a smaller depth than main grooves that define the land portion where this dent part is formed. Multiple sipes are formed to traverse the land portion in a tire width direction between the right and left dent parts opposed to each other. Each of the sipes has a greater depth in both end regions opening to the dent parts than in a center region thereof.

Abstract: A pneumatic tire has a tread pattern which comprises at least three circumferential grooves with a groove width of 6 to 18 mm and a groove depth of 6.0 to 16.0 mm extending in a tire circumferential direction, wherein, on groove walls on both sides forming the at least three circumferential grooves, first inclined walls inclined by an inclination angle of 5 to 20 degrees with respect to the tire circumferential direction and second inclined walls inclined by an inclination angle of 0 to 45 degrees with respect to a tire width direction are provided so as to be successively connected in the tire circumferential direction so that positions of groove ends in the tire width direction vary in the tire circumferential direction.

Abstract: A pneumatic tire includes a tread portion on each side of the equatorial plane. At least two circumferential main grooves and three land portions are formed in the tread portion. In a cross section in a meridian direction of the pneumatic tire, profile lines of the land portions form arcs, and an intersection of extension lines of profile lines of adjacent land portions forms an inflection point in a circumferential main groove. Tensile strength of a reinforcing layer in the land portions is larger than that in the circumferential main groove having the inflection points.

Abstract: Disclosed is a pneumatic tire including a plurality of land portions and a plurality of fine grooves. The plurality of land portions are formed of blocks and a rib, and are defined in a tread part of the pneumatic tire. The fine grooves with a depth of 0.1 mm to 0.8 mm, a width of 0.1 mm to 0.8 mm and a pitch of 0.5 mm to 2.0 mm are formed in the tread surface of each of the land portions to be inclined at an angle of 42° to relative to the circumferential direction of the tire. The inclined directions of the fine grooves relative to the circumferential direction of the tire are reverse to each other on the left and right sides of the equator of the tire.

Abstract: In a pneumatic tire, a rotating direction of the tire is specified. A plurality of sipes are formed in land parts. Each of the sipes has a substantially zigzag shape formed by a string of multiple V-shaped parts in a plan view of a tread part, so that a falling amount of the land parts in the rotating direction of the tire differs from that of the land parts in a reverse direction, against an outside force generated when the tire lands on the ground. Besides, a direction of the V-shaped part of the sipe is set so that the falling amount of the land parts in the rotating direction of the tire is smaller than that in the reverse direction.

Abstract: A tread surface the tire rotational direction of which is specified in one direction includes a first main see-through groove extending in the circumferential direction of the tire in a region of from 4% to 15% of the tire ground contact width from the tire equatorial plane toward each of left and right sides. Lug grooves obliquely extend from the first main see-through grooves toward the outer sides of the tire in the reverse rotational direction of the tire so as to communicate with the tire ground contact ends, the lug grooves being disposed at prescribed intervals in the circumferential direction of the tire. Blocks are defined by the lug grooves and the first main see-through grooves. V-shaped transverse grooves are disposed between the first main see-through grooves at prescribed intervals in the circumferential direction of the tire, the transverse grooves having vertexes that face to the reverse rotational direction of the tire.

Abstract: Provided are a tire forming mold which enables damage on ribs and blocks of a tire to be effectively prevented when the tire is removed from the tire forming mold in spite of a simple structure thereof, and a pneumatic tire producing method using the same. The tire forming mold according to the present invention is a two-division type of tire forming mold, including a mold main body for forming one side of the tire, wherein the mold main body is provided with a movable part which constitutes a part of a tread forming surface in the direction of the circumference thereof while the tire forming mold is being closed, and which can be moved while the tire is being removed from the tire forming mold.

Abstract: Provided are a tire forming mold which enables damage on ribs and blocks of a tire to be effectively prevented when the tire is removed from the tire forming mold in spite of a simple structure thereof, and a pneumatic tire producing method using the same. The tire forming mold according to the present invention is a two-division type of tire forming mold, including a mold main body for forming one side of the tire, wherein the mold main body is provided with a movable part which constitutes a part of a tread forming surface in the direction of the circumference thereof while the tire forming mold is being closed, and which can be moved while the tire is being removed from the tire forming mold.

Abstract: Provided are a tire forming mold which enables damage on ribs and blocks of a tire to be effectively prevented when the tire is removed from the tire forming mold in spite of a simple structure thereof, and a pneumatic tire producing method using the same. The tire forming mold according to the present invention is a two-division type of tire forming mold, including a mold main body for forming one side of the tire, wherein the mold main body is provided with a movable part which constitutes a part of a tread forming surface in the direction of the circumference thereof while the tire forming mold is being closed, and which can be moved while the tire is being removed from the tire forming mold.

Abstract: A tread surface the tire rotational direction of which is specified in one direction includes a first main see-through groove extending in the circumferential direction of the tire in a region of from 4% to 15% of the tire ground contact width from the tire equatorial plane toward each of left and right sides. Rug grooves obliquely extend from the first main see-through grooves toward the outer sides of the tire in the reverse rotational direction of the tire so as to communicate with the tire ground contact ends, the rug grooves being disposed at prescribed intervals in the circumferential direction of the tire. Blocks are defined by the rug grooves and the first main see-through grooves. V-shaped transverse grooves are disposed between the first main see-through grooves at prescribed intervals in the circumferential direction of the tire, the transverse grooves having vertexes that face to the reverse rotational direction of the tire.

Abstract: A pneumatic tire includes a sidewall surface with serrated portions, each of the serrated portions being formed by aligning numerous serrated concavo-convex stripes thereon, the serrated portions being spirally arranged along a circumferential direction of the tire. The concavo-convex stripes are formed by formation of concave grooves on the sidewall surface. The depth of the concave grooves is 0.3 to 2.0 mm. An interval between adjacent serrated portions is set 5 mm or more when measured along a radial direction of the tire.