A pneumatic tire includes a tread surface, a plurality of circumferential main grooves formed on the tread surface and extending in a tire circumference direction, a plurality of lug grooves formed on the tread surface and extending in a tire lateral direction, a plurality of blocks defined by the lug grooves on both sides in the tire circumferential direction and by the circumferential main grooves on at least one end in the tire lateral direction, and narrow grooves formed in the blocks. The narrow grooves include a plurality of bent portions as well as a circumferential narrow groove extending in the tire circumference direction and a lateral narrow groove extending in the tire lateral direction. The lateral narrow groove and the circumferential narrow groove are configured so that at least one thereof is provided in a plurality and includes a plurality of intersection points where the one intersects the other.

A pneumatic tire (10) according to the present invention includes blocks (100) arranged adjacent to each other in a tread surface view, each of the blocks (100) having a wheel tread contacted with a road surface. A circumferential edge (100f) of the block (100) is defined against an adjacent block (100B) adjacent to the block (100A) by a sipe (200). An inner side groove (400) is formed at an inner side in a tire radial direction of the sipe (200). At least a part of the inner side groove (400) is communicated with the sipe (200). The circumferential edge (100f) of the block (100A) is defined against the adjacent block (100B) by the inner side groove (400).

A tire includes annular beads, a body ply extending between the annular beads, and a circumferential belt disposed radially outward of the body ply. The tire further includes a circumferential tread disposed radially outward of the circumferential belt. At least three circumferential grooves divide the tread into two outer circumferential ribs and two inner circumferential ribs. A plurality of rib sipes are disposed on at least one circumferential rib. The tire includes a plurality of curvilinear spline sipes, wherein each curvilinear spline sipe has multiple inflection points. At least one curvilinear spline sipe is disposed on an outer circumferential rib and at least one curvilinear spline sipe is disposed on a different circumferential rib. A localized depth of the at least one curvilinear spline sipe disposed on the outer circumferential rib varies in proportion to the distance from the rib sipes that intersect the at least one curvilinear spline sipe.

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 pneumatic tire is provided with improved braking performance and turning performance on ice. Circumferential narrow grooves are disposed at a density in the tire width direction of not less than 0.06 grooves/mm and not more than 0.2 grooves/mm. Width direction narrow grooves extend at an angle with respect to the tire width direction of not less than 45 and not more than +45. The circumferential narrow grooves have at least one bent portion. The bend angle of the bent portion is not less than 40 and not more than 160.

A tire includes block rows delimited by a pair of circumferential grooves extending in a tire circumferential direction. The block rows include a plurality of blocks partitioned by a plurality of lateral grooves extending in a tire width direction, and each block is partitioned into a plurality of small blocks by a circumferential sipe extending in the tire circumferential direction and a plurality of lateral sipes. The lateral sipes include a first lateral sipe and a second lateral sipe extending in different directions.

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 1 includes a tread portion 2. The tread portion 2 includes tread ends Te, three circumferential grooves 3, and four land portions 4. The circumferential grooves 3 include one shoulder circumferential groove 5 and one crown circumferential groove 6. The land portions 4 include one shoulder land portion 9 and one crown land portion 10. The shoulder land portion 9 includes shoulder blocks having shoulder sipes. An inner end of the shoulder sipe in the tire axial direction terminates at a ground contact surface of the shoulder block. The crown land portion 10 includes crown blocks having crown sipe groups. The crown sipe group includes a first crown sipe having one end connected to the shoulder circumferential groove 5 and another end terminating at a ground contact surface of the crown block, a second crown sipe having one end connected to the crown circumferential groove 6 and another end terminating at the surface, and a third crown sipe having both ends terminating at the surface.

A pneumatic tire includes on a tread surface at least two circumferential main grooves extending in a tread circumferential direction, and a rib-like land portion partitioned by the two circumferential main grooves extending in the tread circumferential direction, wherein: the rib-like land portion has one or more circumferential sipes extending in the tread circumferential direction; and the rib-like land portion has one or more one-end opening lateral grooves and one or more first one-end opening sipes, the one-end opening lateral grooves extending from one of the two circumferential main grooves in a tread widthwise direction until a position connecting to the circumferential sipes, and ending within the rib-like land portion; the first one-end opening sipes extending from the other of the two circumferential main grooves in a tread widthwise direction, and ending within the rib-like land portion without connecting to the circumferential sipes.

A tire includes a tread portion including at least one land portion having axially spaced first and second ends. The at least one land portion is provided with lateral grooves extending from the first end to terminal ends terminating within the at least one land portion, first sipes each extending along a tire circumferential direction to connect a pair of lateral grooves arranged adjacently in the tire circumferential direction, second sipes extending from the first end toward the first sipes, and third sipes extending from the second end toward the first sipes. The second sipes and the third sipes are arranged without intersecting the lateral grooves.