Abstract: A tire comprises a tread portion 2. The tread portion 2 includes a tread ground contacting surface (2s) and at least one main groove 3 recessed from the tread ground contacting surface (2s) and extending continuously in a tire circumferential direction. The main groove 3 has a first groove wall 11. The first groove wall is provided with a recessed portion 15 recessed outwardly in a groove width direction from a groove edge of the main groove 3 on the tread ground contacting surface. The recessed portion 15 is formed of groove wall rubber 8 having a complex elastic modulus larger than that of base rubber 7 forming a main portion of the tread ground contacting surface (2s).

Abstract: A tire comprises a tread portion 2. The tread portion 2 includes a tread ground contacting surface (2s) and at least one main groove 3 recessed from the tread ground contacting surface (2s) and extending continuously in a tire circumferential direction. The main groove 3 has a first groove wall 11. The first groove wall is provided with a recessed portion 15 recessed outwardly in a groove width direction from a groove edge of the main groove 3 on the tread ground contacting surface. The recessed portion 15 is formed of groove wall rubber 8 having a complex elastic modulus larger than that of base rubber 7 forming a main portion of the tread ground contacting surface (2s).

Abstract: A side reinforcing rubber layer includes a second rubber portion having a modulus constant between a boundary surface and a bead portion and larger than a first rubber portion arranged on a tread-portion-2 side. The boundary surface intersects outer and inner surfaces of the side reinforcing rubber layer at first and third points, respectively. The first and third points are arranged on the bead-portion side of second and fourth points, respectively, which are closest points to an outer end of a belt layer of the outer and inner surfaces, respectively. A distance between an inner end of the first rubber portion and the second point is larger than a distance between the second point and the first point.

Abstract: In order to improve fuel economy while ensuring driving stability, a pneumatic tire is provided with one carcass ply, two belt plies, and one band ply, and satisfies the following: Wt??0.7257×(Db)2+42.763×Db?339.67??(1) Wt??0.7257×(Db)2+48.568×Db?552.33??(2) Dt?59.078×Wt0.498??(3) Dt?59.078×Wt0.467??(4) where Wt (unit: mm) is the tire cross section width, Db (unit: inches) is the bead diameter, and Dt (unit: mm) is the tire outer diameter, with a carcass cord being made of an aramid fiber cord.

Abstract: A pneumatic tire comprises: a tread portion; a pair of sidewall portions; a pair of bead portions each with a bead core therein; a carcass having a main portion extending between the bead portions; a belt disposed radially outside the carcass in the tread portion; a bead apex disposed in each of the bead portions and extending radially outwardly from the bead core, wherein the radial height h1 of the radially outer edge of the bead apex rubber is not more than 28% of the tire section height H; and a sidewall reinforcing rubber layer disposed in each of the sidewall portions and extending along the carcass main portion at least between a radial position corresponding to the radial position of the radially outer edge of the bead apex rubber and an axial position corresponding to the axial position of the axially outer edge of the belt, wherein the sidewall reinforcing rubber layer has a thickness in a range of from 0.5 to 1.5 mm and a complex elastic modulus E* in a range of from 13 to 16 MPa.

Abstract: A pneumatic radial tire which includes a tread portion defining an overall diameter of the tire under a normally-inflated unloaded state and a ground contacting width under a normally inflated loaded state; a pair of sidewall portions defining an overall width of the tire there between under the normally-inflated unloaded state; a pair of bead portions each with a bead core therein; a carcass extending between the bead portions through the tread portion and, sidewall portions; and a belt disposed radially outside the carcass in the tread portion, wherein the overall diameter of the tire is in the range of from 750 to 820 mm; the ground contacting width is in the range of from 85 to 90% of said overall width of the tire; and the carcass comprises an ultrahigh-turnup ply extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each of the bead portions so that the turned-up portions each extend radially outwardly into the tread portion through the

Abstract: A pneumatic radial tire 1 including a carcass 6 and a belt layer 7 is provided with a cord-reinforced layer 12 with reinforcing cords of organic fiber being disposed at angles of 30 to 60 degrees with respect to a tire circumferential direction at a buttress portion Bs thereof. A ply turnup portion 11 of the carcass 6 is terminated radially outside a tire maximum width point M. The cord-reinforced layer 12 is arranged such that its outer end portion in the radial direction 12U is pinched between the carcass 6 and the belt layer 7 and such that its radially inner end portion 12L is secured between the ply main portion 10 and the ply turnup portion 11 of the carcass 6.

Abstract: A pneumatic tire comprises: a tread portion; a pair of sidewall portions; a pair of bead portions each with a bead core therein; a carcass having a main portion extending between the bead portions; a belt disposed radially outside the carcass in the tread portion; a bead apex disposed in each of the bead portions and extending radially outwardly from the bead core, wherein the radial height h1 of the radially outer edge of the bead apex rubber is not more than 28% of the tire section height H; and a sidewall reinforcing rubber layer disposed in each of the sidewall portions and extending along the carcass main portion at least between a radial position corresponding to the radial position of the radially outer edge of the bead apex rubber and an axial position corresponding to the axial position of the axially outer edge of the belt, wherein the sidewall reinforcing rubber layer has a thickness in a range of from 0.5 to 1.5 mm and a complex elastic modulus E* in a range of from 13 to 16 MPa.

Abstract: A pneumatic radial tire 1 including a carcass 6 and a belt layer 7 is provided with a cord-reinforced layer 12 with reinforcing cords of organic fiber being disposed at angles of 30 to 60 degrees with respect to a tire circumferential direction at a buttress portion Bs thereof. A ply turnup portion 11 of the carcass 6 is terminated radially outside a tire maximum width point M. The cord-reinforced layer 12 is arranged such that its outer end portion in the radial direction 12 U is pinched between the carcass 6 and the belt layer 7 and such that its radially inner end portion 12 L is secured between the ply main portion 10 and the ply turnup portion 11 of the carcass 6.

Abstract: A pneumatic radial tire comprises: a tread portion defining an overall diameter of the tire under a normally-inflated unloaded state and a ground contacting width under a normally inflated loaded state; a pair of sidewall portions defining an overall width of the tire therebetween under the normally-inflated unloaded state; a pair of bead portions each with a bead core therein; a carcass extending between the bead portions through the tread portion and sidewall portions; and a belt disposed radially outside the carcass in the tread portion, wherein the overall diameter of the tire is in a range of from 750 to 820 mm; the ground contacting width is in a range of from 85 to 90% of said overall width of the tire; and the carcass comprises an ultrahigh-turnup ply extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each of the bead portion so that the turned-up portions each extend radially outwardly into the tread portion through the sidewall p

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the bead portions, a breaker disposed radially outside the carcass, and a band disposed radially outside the breaker and composed of a full width ply extending across the substantially overall width of the breaker and a pair of axially spaced edge plies. In a ground contacting face of the tire under a normally inflate loaded condition which face has axially outermost edges between which the ground contacting width TW is defined, the circumferential length LS of the ground contacting face at an axial position 10% of TW axially inwards of each of the axially outermost edges is in a range of from 75 to 85% of the circumferential length Lc of the ground contacting face at the center of the ground contacting width.

Abstract: A tire and tread pattern in which the residual cornering force is minimized. The tread pattern comprises: a plurality of design cycles, each comprising a first sub-design-unit (SA) and a second sub-design-unit (SE), the first sub-design-unit (SA) comprises lateral grooves which are inclined to the same direction, the second sub-design-unit (SE) comprises lateral grooves which are inclined to the same direction but the reverse of the first sub-design-unit, the first sub-design-unit (SA) is a mirror image of the second sub-design-unit (SE), and the inclination angles of the lateral grooves in each of the sub-design-units (SA and SE) to the axial direction of the tire are gradually decreased from the circumferential center (M) to each edge (L) of the sub-design-unit.