Abstract: A pneumatic tire includes a tread portion provided with at least one circumferentially extending main groove, and at least one lateral groove extending from the main groove. The at least one lateral groove comprises a bottom, and at least one stepwise groove wall that includes at least one level part, wherein the number of level part is not more than three. In a cross-sectional view of the lateral groove, a depth Da from a ground contacting surface of the tread portion to a radially innermost level part is in a range of from 50% to 80% a maximum groove depth D4 of the lateral groove, and a width Wa from the radially innermost level part to a groove edge of the stepwise groove wall measured along in a groove width direction is in a range of from 50% to 150% the depth Da.

Abstract: A pneumatic tire includes a tread portion provided with a pair of shoulder main grooves and at least one crown main groove between the shoulder main grooves to define a pair of middle portions between the adjacent shoulder main groove and crown main groove. The middle portions are provided with inner middle lug grooves and outer middle lug grooves. Each outer middle lug groove extends from the shoulder main groove to its axially inner end while decreasing its groove width. The outer middle lug groove are arranged with alternately arranged first pitches and second pitches, wherein the second pitches are larger than the first pitches. Each inner middle lug groove extends from the crown main groove to its axially outer end while decreasing its groove width. The inner middle lug grooves are arranged with substantially the same pitches.

Abstract: A heavy duty tire includes a tread portion provided with a pair of circumferential main grooves including at least one zigzag groove, lateral grooves extending between the main grooves to form center blocks therebetween, and lug grooves. Each lug groove includes an axially inner portion connecting to the zigzag groove while curving toward a first circumferential direction of the tire. The lug groove has a first groove edge disposed on a side of the first circumferential direction and a second groove edge facing against the first groove edge. The first groove edge is connected to an axially outer groove edge of the zigzag groove. The second groove edge is connected to an axially inner groove edge of the zigzag groove. The lug groove includes a constant groove width, and a groove-bottom width smoothly decreasing axially inward from the tread edge.

Abstract: A tire cord fabric having paired cords used as warps. The fabric is suitable for use in pneumatic tires as carcass and cap ply reinforcement, enabling the use of less rubber and higher cord content in a specified cord-rubber composite volume.

Abstract: A pneumatic tire comprises shoulder land zones and middle land zones divided by shoulder main grooves and a crown main groove. The shoulder land zone is divided by shoulder lateral grooves into shoulder blocks. The middle land zone is formed as a circumferential rib in substance. The middle land zone is provided with first and second middle outward slots which extend from the shoulder main groove toward the axially inside beyond the widthwise center line of the middle land zone, while gradually decreasing the width and inclining with respect to the tire axial direction at an angle ?1 and an angle ?2 (?2>?1), respectively, and terminate within the middle land zone. The open ends of the first and second middle outward slots respectively face the open ends of the shoulder lateral grooves at the shoulder main groove.

Abstract: A tire comprising a tread portion designed to be worn off during the life of the tire having a radial thickness T, an outer edge and an inner edge, the axial distance between the outer edge and the inner edge defining the axial width L of the tread, the tread comprising four adjacent portions made of a four rubber compounds, wherein the rubber compounds making up the first and third portions are predominantly filled with carbon black filler, wherein the rubber compounds making up the second and fourth portion are predominantly filled with non carbon black filler, wherein the rubber compounds making up the first and third portions have a value for tan ? at 0° C., at a stress of 0.7 MPa, that is lower than that of the rubber compounds making up the second and fourth portion, and wherein the axial width of the first portion decreases and the axial width of the second portion increases as a function of the distance from the rolling surface of the tread when unworn.

Abstract: The invention relates to a tire having four treads distributed equidistantly on the external part of the body or carcass, which allow the tire to be deflated and rotated in order for a new tread to be placed in contact with the ground when the current tread has been subjected to heavy wear, without the tire having to be replaced. The invention is advantageous for the tire owner since with just a small increase in outlay the owner is guaranteed a tire that will last longer and that can be used for an increased number of kilometers of cycling.

Abstract: Provided is a pneumatic radial tire for aircraft that includes a radial carcass constituting a backbone structure of the tire, a belt (6) disposed along an outer periphery of a crown region of the radial carcass, and at least one protective layer (7) disposed along an outer periphery of the belt (6) and formed by a plurality of cords (9). The cords (9) in the protective layer (7) are curved in a sinusoidal shape and disposed in parallel with equal phase. An acute inclination angle ? between an amplitude center line of each cord (9) relative to a tire circumferential direction, a half amplitude a of each cord (9), and a wavelength ? of each cord (9) satisfy the relationship: tan ?>2?a/?>0.4 (0°<?<90°).

Abstract: 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 (2?N?4) 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.

Abstract: A pneumatic tire includes a tread portion provided with a pair of shoulder main grooves adjacent to each tread edge, and shoulder lateral grooves extending from each shoulder main grooves to each tread edge. Each shoulder lateral groove includes an axially inner portion extending from the shoulder main groove with a first angle, an axially middle portion extending from the axially inner portion with a second angle larger than the first angle, and an axially outer portion extending from the axially middle portion with a third angle smaller than the second angle. The shoulder lateral grooves include first and second shoulder lateral grooves alternately arranged in a circumferential direction of the tire. The axially middle portion of the first shoulder lateral groove is disposed axially inwardly of the axially middle portion of the second shoulder lateral groove.

Abstract: A pneumatic tire for running on rough terrain comprises a tread portion provided with center blocks, middle blocks and shoulder blocks to form a block tread pattern, wherein some or all of the center blocks are each provided with a slot positioned at the midpoint of the block in the tire circumferential direction, and extending axially inwardly from a sidewall surface of the block oriented toward a tread edge, and terminating within the block.

Abstract: A pneumatic tire including a closed sipe in a land portion 3 formed in a tread surface, provided with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion. The cuts are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, and a twist angle thereof is not less than 10° and not more than 135°. Additionally, a length in the radiation direction of the cuts or a width of the cuts is formed larger at a tread surface side than at a bottom surface side.

Abstract: An object of the present invention is to adequately control relationship between a cross sectional width SW and an outer diameter OD of a pneumatic radial tire for a passenger vehicle. Specifically, a ground contact surface 1 of the tread of the pneumatic radial tire for a passenger car of the present invention is provided with either, as a groove, only at least one main groove 2a extending in the tread circumferential direction or, as grooves, only the main groove 2a and at least one auxiliary groove 2b other than the main groove, wherein the auxiliary groove has a groove width?2 mm in a tread widthwise region and a negative ratio of the main groove 2a is in the range of 12% to 20% (inclusive of 12% and 20%).

Abstract: In a pneumatic tire, the groove width of the connecting subsidiary grooves changes midway. The relationship between the groove width (W1) connecting to the circumferential main groove on the outer side in the tire width direction and the groove width (W2) connecting to the circumferential main groove on the inner side in the tire width direction satisfies the range of 0.30?W1/W2?0.70. The relationship between the groove length (L1) on the tread surface having a region of groove width (W1) and the groove length (L2) on the tread surface having a region of groove width (W2) satisfies the range of 0.25?L2/L1?0.65. Sipes are provided on the tread surface of the block-like land portions. The respective end portions of the sipes connect to a position where the groove width (W1) of the connecting subsidiary grooves changes to the groove width (W2).

Abstract: Plural lug grooves are formed that extend from an outermost circumferential direction groove towards a tire equatorial plane side and are disposed sloped with respect to the tire equatorial plane at intervals along the tire circumferential direction. Arc shaped communication grooves are formed in segment land portions arising from a land portion being segmented in the tire circumferential direction by the lug grooves. The communication grooves communicate between the lug grooves adjacent to each other in the tire circumferential direction.

Abstract: Inflatable article equipped with an elastomer layer impermeable to the inflation gases, said elastomer layer comprising at least, as the predominant elastomer, a thermoplastic stirene/isobutylene/stirene (SIBS) elastomer. Preferably the SIBS elastomer comprises between 5% and 50% by weight of stirene, its number-average molecular weight is between 30 000 and 500 000 g/mol, and its Tg is below ?20° C. Preferably the airtight elastomer layer also comprises, as a plasticizing agent, an extender oil for the SIBS elastomer with a content preferably between 5 and 100 phr. The inflatable article is, in particular, an inner tube or a pneumatic tire for a motor vehicle.

Abstract: A shoulder main groove has a plurality of circumferential components inclined to an inside in a tire width direction toward a forward in a tire rotating direction. The circumferential components are communicated with each other via a lateral groove. A shoulder block row includes a first block positioned in a rear side in the tire rotating direction of the circumferential component, and a second block which has a smaller area of a top surface than the first block, and is adjacent to the first block with the lateral groove sandwiched therebetween. A plurality of projections elevating from a groove bottom and protruding out of a side wall of the second block are provided. A volume of the projection positioned in a trailing side of the second block is larger than a volume of the projection positioned in a leading side.

Abstract: A pneumatic tire with good fuel efficiency, drainage performance and uneven wear resistance is provided. A pneumatic tire has a tread surface provided with circumferential main grooves to define a center region and two side regions. The center region is provided with a first circumferential narrow groove and second circumferential narrow grooves located between the first circumferential narrow groove and the circumferential main grooves; and center rib-like land portions including first center rib-like land portions defined by the first circumferential narrow groove and the second circumferential narrow grooves, and second center rib-like land portions defined by the second circumferential narrow grooves and the circumferential main grooves. The center rib-like land portions located next to each other with the center circumferential narrow grooves being therebetween are adapted to supportingly contact with each other.

Abstract: A motorcycle tire for running on rough terrain comprises a tread portion provided with a plurality of blocks defining a block pattern. The blocks include center blocks whose centroids of their top surfaces are disposed within a center region of the tread portion defined as being centered on the tire equator and having a developed width of 25% of a developed tread width. The top surface of each of the center blocks is provided with an axially extending edge extending straight and parallel with the tire axial direction, and arc edges curved convexly toward the centroid of the top surface and disposed on both sides of the axially extending edge in the tire axial direction.

Abstract: A pneumatic tire is provided with a decoration portion at a tire side portion. The decoration portion includes decoration elements, which include ridges, and gullies, which are inclined with respect to the tire circumferential direction and divide the decoration elements into at least two regions. Thus, the gullies make the ridges non- continuous in the tire circumferential direction. The ridges include first ridges and second ridges that are smaller than the first ridges in one or both of height and width. At least some of the first ridges are inclined with respect to the tire circumferential direction and are adjacent to one another. Thus, the gullies are formed between the adjacent first ridges.