Abstract: A heavy duty tire includes, in a tread portion, circumferentially extending zigzag center main grooves, circumferentially extending linear shoulder main grooves, a center land portion, middle land portions, and shoulder land portions. The middle land portions have middle inclined grooves connecting an axially outer top portion of one of the center main grooves and its adjacent shoulder main groove. The shoulder land portions have shoulder inclined grooves connecting one of the shoulder main grooves and its adjacent tread grounding end. The center land portion has first center inclined sipes connecting an axially inner top portion of one of the center main grooves and its adjacent axially inner top portion of the other center main groove and second center inclined sipes connecting an axially outer top portion of one of the center main grooves and its adjacent axially outer top portion of the other center main groove.

Abstract: Provided is a heavy duty tire that has high levels of both tire rolling resistance performance and wet performance. The heavy duty tire has provided in a tread portion: a pair of center main grooves extending in a zigzag shape in the tire circumferential direction; a pair of shoulder main grooves extending linearly in the tire circumferential direction; and a center land portion, a middle land portion, and a shoulder land portion that are divided. Middle inclined grooves, connecting connect an outer top portion in the tire axial direction in the center main grooves and the shoulder main grooves, are formed in the middle land portion. Shoulder inclined grooves, connecting the shoulder main grooves and a tread grounding end Te, are formed in the shoulder land portion.

Abstract: A pneumatic tire has an asymmetrical tread pattern. An outboard central main circumferential groove extends zigzag and is made up of alternate minor and major groove segments. The major groove segments incline at an angle of from 5 to 30 degrees with respect to the tire circumferential direction. An inboard central main circumferential groove is widest in main circumferential grooves. Outboard middle axial grooves are widest in axial grooves. The distance Li of the widthwise center line of the straight inboard central main circumferential groove from the tire equator is less than the distance Lo of the amplitude center line of the zigzag outboard central main circumferential groove from the tire equator.

Abstract: A pneumatic tire provided with a tread pattern, wherein a tread half which is one half of the tread pattern on each side of the tire equator is made up of repeat design units arranged circumferentially of the tire. The repeat design units have at least two different circumferential pitch lengths, and the repeat design units are each provided with at least one stud hole.

Abstract: A pneumatic tire (1) provided in the tread portion (2) with a row (5R) of crown blocks (5b) divided by crown axial grooves (8), two rows (6R) of middle blocks (6b) divided by middle axial grooves (9), and two rows (7R) of shoulder blocks (7b) divided by shoulder axial grooves (10), Each of the crown axial grooves (8) is circumferentially aligned with one of the middle axial grooves (9) such that the crown axial groove (8) is positioned within a middle-axial-groove range (Mc) defined between 1st and 2nd axial straight lines (Za and Zb) which are drawn passing through 1st and 2nd extreme circumferential end points (9a and 9b) of the middle axial groove (9), respectively. The circumferential length of the middle-axial-groove range (Mc) is not less than 25% but not more than 50% of a pitch length (P) defined between the two 1st extreme circumferential end points (9a and 9a). The middle-axial-groove range (Mc) does not overlap with any of the shoulder axial grooves (10).

Abstract: A pneumatic tire has an asymmetrical tread pattern. An outboard central main circumferential groove extends zigzag and is made up of alternate minor and major groove segments. The major groove segments incline at an angle of from 5 to 30 degrees with respect to the tire circumferential direction. An inboard central main circumferential groove is widest in main circumferential grooves. Outboard middle axial grooves are widest in axial grooves. The distance Li of the widthwise center line of the straight inboard central main circumferential groove from the tire equator is less than the distance Lo of the amplitude center line of the zigzag outboard central main circumferential groove from the tire equator.

Abstract: A pneumatic tire provided with a tread pattern, wherein a tread half which is one half of the tread pattern on each side of the tire equator is made up of repeat design units arranged circumferentially of the tire. The repeat design units have at least two different circumferential pitch lengths, and the repeat design units are each provided with at least one stud hole.

Abstract: A pneumatic tire (1) provided in the tread portion (2) with a row (5R) of crown blocks (5b) divided by crown axial grooves (8), two rows (6R) of middle blocks (6b) divided by middle axial grooves (9), and two rows (7R) of shoulder blocks (7b) divided by shoulder axial grooves (10), Each of the crown axial grooves (8) is circumferentially aligned with one of the middle axial grooves (9) such that the crown axial groove (8) is positioned within a middle-axial-groove range (Mc) defined between 1st and 2nd axial straight lines (Za and Zb) which are drawn passing through 1st and 2nd extreme circumferential end points (9a and 9b) of the middle axial groove (9), respectively. The circumferential length of the middle-axial-groove range (Mc) is not less than 25% but not more than 50% of a pitch length (P) defined between the two 1st extreme circumferential end points (9a and 9a). The middle-axial-groove range (Mc) does not overlap with any of the shoulder axial grooves (10).

Abstract: A heavy duty tire having both an excellent wear resistance and a low rolling resistance and comprising a tread rubber having a two layer structure composed of a cap rubber layer 2Gb and a base rubber layer 2Ga underlying the cap layer, wherein the tread rubber extends axially outward from the tire equator and is bent at its edges to extend radially downward so that the cap layer is located axially outward of the base layer, and a pair of sidewall rubbers are disposed so that the radially outer end portion of each sidewall rubber covers the surface of the axially outer end of the tread rubber.

Abstract: A heavy duty tire with decreased rolling resistance without impairing durability, comprising carcass 6, belt layer 7 disposed radially outward of the carcass in tread portion 2, and sidewall rubber 3g disposed axially outward of the carcass in sidewall portion 3 and extending in the radial direction of the tire, wherein the sidewall rubber includes an axially inner rubber portion 10 disposed axially outward of the carcass and an axially outer rubber portion 11 disposed axially outward of the inner rubber portion to form the tire outer surface, the inner rubber portion 10 has a lower loss tangent “tan ?” than the outer rubber portion 11 by a difference of 0.010 to 0.035, and the inner rubber portion 10 has a lower complex elastic modulus than the outer rubber portion 11 by a difference of 0.5 to 1.4 MPa.

Abstract: A heavy duty tire with decreased rolling resistance without impairing durability, comprising carcass 6, belt layer 7 disposed radially outward of the carcass in tread portion 2, and sidewall rubber 3g disposed axially outward of the carcass in sidewall portion 3 and extending in the radial direction of the tire, wherein the sidewall rubber includes an axially inner rubber portion 10 disposed axially outward of the carcass and an axially outer rubber portion 11 disposed axially outward of the inner rubber portion to form the tire outer surface, the inner rubber portion 10 has a lower loss tangent “tan ?” than the outer rubber portion 11 by a difference of 0.010 to 0.035, and the inner rubber portion 10 has a lower complex elastic modulus than the outer rubber portion 11 by a difference of 0.5 to 1.4 MPa.

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a bead core disposed in each bead portion, a carcass comprising a ply of carcass cords extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each bead portion, and an inner liner made of air-impermeable rubber extending on the tire cavity side of the carcass from one of the bead portions to the other. The radially inner end of the inner liner is located radially inside the radially innermost end of the carcass. In a radial region between the radially innermost end of the carcass and the radially outermost end of the bead core, the thickness of the inner liner is not less than 0.15 time but not more than 4.0 times the cross section diameter of the carcass cord.

Abstract: A heavy duty tire having both an excellent wear resistance and a low rolling resistance and comprising a tread rubber having a two layer structure composed of a cap rubber layer 2Gb and a base rubber layer 2Ga underlying the cap layer, wherein the tread rubber extends axially outward from the tire equator and is bent at its edges to extend radially downward so that the cap layer is located axially outward of the base layer, and a pair of sidewall rubbers are disposed so that the radially outer end portion of each sidewall rubber covers the surface of the axially outer end of the tread rubber, and wherein the cap layer, the base layer and the sidewall rubber satisfy the dimensional relationships that on a lateral base line X drawn in the tire axial direction from an axially outer end 7Be of a belt ply 7B having the maximum width, the La/Lt ratio of a thickness La of the base layer 2Ga in the bent portion to a distance Lt from the axially outer end 7Be to the tire outer surface is 0.6 to 0.

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a bead core disposed in each bead portion, a carcass comprising a ply of carcass cords extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each bead portion, and an inner liner made of air-impermeable rubber extending on the tire cavity side of the carcass from one of the bead portions to the other. The radially inner end of the inner liner is located radially inside the radially innermost end of the carcass. In a radial region between the radially innermost end of the carcass and the radially outermost end of the bead core, the thickness of the inner liner is not less than 0.15 time but not more than 4.0 times the cross section diameter of the carcass cord.

Abstract: A pneumatic tire comprises a pair of bead portions each provided therein with a bead core made of windings of at least one wire, a carcass ply of cords extending between the bead portions and turned up around the bead core from the axially inside to the outside of the tire to form a pair of turnup portions and a main portion therebetween, a rubber bead apex disposed radially outside the bead core and between each said turnup portion and the main portion, and a fiber reinforced rubber spacer interposed between the bead core and the carcass ply to provide a positive distance between the carcass ply cords and bead core wire. The fiber reinforced rubber spacer has a securing portion which extends radially outwardly and axially outwardly from the axially inside of the bead core while separating from the bead core but contacting with the rubber bead apex. A distance (L1, L2) between an outermost point of the securing portion and the bead core is in a range of from 0.05 to 1.0 times a height of the bead core.

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a bead core disposed in each bead portion, a carcass comprising a ply of carcass cords extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each bead portion, and an inner liner made of air-impermeable rubber extending on the tire cavity side of the carcass from one of the bead portions to the other. The radially inner end of the inner liner is located radially inside the radially innermost end of the carcass. In a radial region between the radially innermost end of the carcass and the radially outermost end of the bead core, the thickness of the inner liner is not less than 0.15 time but not more than 4.0 times the cross section diameter of the carcass cord.

Abstract: A pneumatic tire comprises a carcass ply extending between bead portions and is turned up around a bead core in each bead portion to form two turnup portions and a main portion therebetween; each of the turnup portion extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space is surrounded by the carcass ply main portion, and each turnup portion and the bead core is filled with a small size bead apex rubber or a gas; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.

Abstract: A pneumatic tire comprises a carcass ply extending between bead portions and is turned up around a bead core in each bead portion to form two turnup portions and a main portion therebetween; each of the turnup portion extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space is surrounded by the carcass ply main portion, and each turnup portion and the bead core is filled with a small size bead apex rubber or a gas; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.

Abstract: A pneumatic tire comprises a carcass ply extending between bead portions and turned up around a bead core in each bead portion to form two turnup portion and a main portion therebetween; each of the turnup portion extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space surrounded by the carcass ply main portion, each turnup portion and the bead core is filled with a small size bead apex rubber or a gus; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.

Abstract: A pneumatic tire comprises a carcass ply extending between bead portions and turned up around a bead core in each bead portion to form two turnup portion and a main portion therebetween; each of the turnup portion extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space surrounded by the carcass ply main portion, each turnup portion and the bead core is filled with a small size bead apex rubber or a gus; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.