The pneumatic tire of this disclosure comprises on a tread surface one or more land portions, wherein the land portions is formed into a protruding shape such that its tire radial outline in a tire widthwise cross section protrudes to a tire radial outer side, the outline includes, in the tire widthwise cross section, at least a first arcuate surface having a radius of curvature of a tire widthwise center of the land portion, and second arcuate surfaces having radiuses of curvature smaller than the first arcuate surface and located on both tire widthwise edges of the land portion, sipes extending in the tire width direction are formed on the land portions formed into the protruding shape, the sipes have chamfer portions, and the chamfer portions have chamfer widths on at least one of both tire widthwise edges larger than chamfer widths on the tire widthwise center.

Tread having a plurality of generally circumferentially orientated grooves delimiting a plurality of relief elements, this tread further comprising a plurality of cut-outs in the form of transversely orientated grooves and/or slits, each relief element comprising a contact face intended to come into contact with the road and lateral faces cutting this contact face along edges intended to come into contact with a road during running, this tread having chamfers on at least a plurality of transverse edges of the relief elements, this tread having, in straight-line running, a total contact surface S comprising a part Sc in which all the transverse edges have chamfers and a part Snc in which all the transverse edges are free of chamfers, this tread having, in a cornering maneuver corresponding to a transverse acceleration of 0.3 g (where g is the acceleration due to gravity), a total footprint surface S* formed by a part Sc* comprising chamfers on all the transverse edges of its relief elements and a part Snc* free of any chamfer, this tread being such that the ratio Snc/Sc is equal to not more than 2% and that the ratio Snc*/Sc* is equal to or greater than 10%.

A pneumatic tire includes at least four circumferential main grooves extending in the tire circumferential direction; and at least five rows of land portions including a center land portion, a pair of second land portions, and a pair of shoulder land portions, which are defined by the circumferential main grooves. Additionally, at least one row of the second land portions is provided with a plurality of lug grooves penetrating through the second land portion in the tire width direction, and a plurality of blocks defined by the plurality of lug grooves. Moreover, the plurality of blocks include one of the circumferential narrow grooves, respectively, which penetrates through the blocks in the tire circumferential direction.

A pneumatic tire is provided with four or more circumferential main grooves extending in a tire circumferential direction and five or more land portions defined by the circumferential main grooves. Additionally, second land portions are each provided with first through lug grooves and second through lug grooves that extend through the second land portion in a tire lateral direction and are adjacently arranged in the tire circumferential direction. Crossing angles of the first through lug grooves and the second through lug grooves with respect to the outermost circumferential main grooves are mutually different.

This pneumatic tire includes, on the tread surface, land portions defined by circumferential main grooves extending continuously in the tread circumferential direction and by tread edges. An intermediate land portion on one side in the tread width direction, adjacent to the tire equatorial plane side of the outermost circumferential main groove on the one side, is formed into blocks only by sipes extending in the tread width direction, an intermediate land portion on the other side in the tread width direction, adjacent to a tire equatorial plane side of an outermost circumferential main groove on the other side, is formed in a ribbed shape, and intermediate land portion lug grooves are formed in the intermediate land portion on the other side, with one end opening into the outermost circumferential main groove on the other side, and the other end terminating within the intermediate land portion on the other side.

A pneumatic tire includes circumferential grooves aligned in a lateral direction and extending in a circumferential direction, lateral grooves aligned in the circumferential direction and extending to cross the circumferential direction, communicating at ends with the circumferential grooves and defining a block-shaped land portion between the circumferential grooves, two narrow grooves aligned in the lateral direction and extending in the circumferential direction, communicating at ends with a lateral groove and dividing the land portion defined by each of the circumferential grooves and each of the lateral grooves into small land portions, the narrow grooves having a smaller groove width than the circumferential grooves and being formed with a bent portion in an intermediate portion, the bent portion being disposed inward in the lateral direction, and bend points of the bent portions being disposed at positions offset from one another in the circumferential direction.

A tire has a lug that forms a contact patch surface, and a recessed region that extends along a prescribed direction and that is recessed relative to the contact patch surface. The recessed region has a first vertical face that that forms a first edge between the first vertical face and the contact patch surface, and a planar base that extends in a width direction of the recessed region which is perpendicular to the prescribed direction. The planar base has at least two planar regions having mutually different heights and arrayed along the prescribed direction. The recessed region further has a second vertical face that connects the two planar regions and that forms a third edge between the second vertical face and a higher one of the planar regions. The third edge is inclined with respect to both a tire width direction and a tire circumferential direction.

A tire is provided with multiple projection parts in a groove bottom of a groove portion. The projection parts extend from one side wall to the other side wall opposed to the one side wall, the side walls forming the groove portion. The projection parts are arranged at predetermined intervals in the groove portion. A relationship of 0.75L≦P≦10L is satisfied where L denotes a length of the projection parts and P denotes the predetermined intervals. In addition, a relationship of TWf/cos θf≦0.9W is satisfied where W denotes a groove width of the groove, TWf denotes a width of the projection parts, and θf denotes an angle formed by an extending direction of the projection parts and a groove center line in a direction opposite to a rotation direction of the tire in a tread face view of the tire.

This pneumatic tire includes, on a tread surface, land portions defined by tread edges and by circumferential main grooves extending continuously in the tread circumferential direction; central sipes, in a central land portion on a tire equatorial plane, extending in the tread width direction and formed at a predetermined pitch length, the central land portion being continuous in the tread circumferential direction between adjacent central sipes; and intermediate sipes, in intermediate land portions adjacent to the central land portion on both sides in the tread width direction with the circumferential main grooves therebetween, extending in the tread width direction and being formed at a predetermined pitch length, each intermediate land portion being continuous in the tread circumferential direction between adjacent intermediate sipes. The pitch length of the intermediate sipes is longer than that of the central sipes, and both ends of the central sipes open into the circumferential main grooves.

A pneumatic tire comprises a tread portion 2 provided with a circumferential land region 6 provided with a plurality of combined sipes 35 (36, 37). The combined sipes 35 (36, 37) are each composed of a straight portion 34 extending from one edge toward the other edge of the circumferential land region 6, and an arc-shaped portion 33 extending from the straight portion 34 to the other edge of the circumferential land region 6. The combined sipes 35 include a first combined sipe 36 in which the maximum depth of its arc-shaped portion 33 is larger than the maximum depth of its straight portion 34, and a second combined sipe 37 in which the maximum depth of its straight portion 34 is larger than the maximum depth of its arc-shaped portion 33.