Center land portions of a tire each include a circumferential narrow groove extending in a tire circumferential direction, and a first lateral groove opening to one edge portion of each of the center land portions at one end and connecting to the circumferential narrow groove at the other end, and a second lateral groove opening to the other edge portion of the center land portion at one end and connecting to the circumferential narrow groove at the other end. Further, the circumferential narrow groove has a zigzag shape formed by repeatedly connecting a first long portion, a first short portion, a second long portion, and a second short portion. Furthermore, the first lateral groove connects to the first long portion of the circumferential narrow groove having the zigzag shape, and the second lateral groove connects to the second long portion of the circumferential narrow groove having the zigzag shape.

In a pneumatic tire having a point-symmetric structure block pattern, narrow and wide outer blocks having different outer end positions in the lateral direction are alternately arranged in the circumferential direction. Among side blocks provided in a side region, large and small blocks are disposed respectively on the outer sides of the narrow and wide outer blocks in the lateral direction. The lateral and side grooves are continuous such that the groove width of the side groove connected to the wide portion of the lateral groove where the outer block converges toward the inner side in the radial direction, and the groove width of the side portion connected to the narrow portion of the lateral groove where the outer block widens toward the inner side in the radial direction, and the side block is tapered with an inner portion block width in the radial direction converges toward the wide portion.

A tire with a tread (10) having at least one series (12) of rubber blocks (13.sub.i−1, 13.sub.i, 13.sub.i+1, 13.sub.i+2) delimited pairwise by a series of sipes (14.sub.i−1,14.sub.i, 14.sub.i+1,14.sub.i+2,14.sub.i+3), with the blocks (13.sub.i−1, 13.sub.i, 13.sub.i+1, 13.sub.i+2) extending one after another in a circumferential direction (X), each block (13.sub.1−1, 13.sub.i, 13.sub.i+1, 13.sub.i+2) of the series (12) of rubber blocks having a circumferential length (L.sub.i−1, L.sub.i, L.sub.i+1, L.sub.i+2)), each sipe (14.sub.i−1,14.sub.i, 14.sub.i+1, 14.sub.i+2,14.sub.1+3) having a circumferential width (E.sub.i−1, E.sub.i,E.sub.i+1, E.sub.i+2, E.sub.i+3). The series (12) of rubber blocks have blocks belonging to at least two different classes of blocks ((13.sub.i−113.sub.i); (13.sub.i+1, 13.sub.i+2)), the blocks of the one same class having a substantially identical circumferential length, the blocks of two different classes of blocks having distinct circumferential lengths.

A tread portion includes a groove having first and second groove walls opposing each other, at least one first recess formed by partially recessing the first groove wall, and at least one second recess formed by partially recessing the second groove wall. A depth of each of the first and second recess from a ground contact surface is less than a groove depth of the groove. The first recess includes a first opening disposed at the first groove wall, and a first end portion extending substantially parallel to the first opening at a position farthest from the first opening. The second recess includes a second opening disposed at the second groove wall, and a second end portion extending substantially parallel to the second opening at a position farthest from the second opening. The first and second end portions are disposed so as not to oppose each other through the groove.

The tire can have a tread portion. The tread portion can include a first shoulder circumferential groove and a first shoulder land portion. In the first shoulder land portion, a plurality of first shoulder lateral grooves can be disposed. At least one of the first shoulder lateral grooves can include an inner end connected to the first shoulder circumferential groove, a maximum groove width portion, and an outer portion. The maximum groove width portion can be at almost the center, in a tire axial direction, of a ground contact surface of the first shoulder land portion. A groove width at the inner end and a groove width, on a first tread end, of the first shoulder lateral groove can each be less than the maximum groove width. A groove width of the outer portion can be reduced outward in the tire axial direction.

A two-wheeled vehicle tyre includes a tread portion which is provided with a row of crown blocks arranged on a tyre equator and a row of middle blocks arranged axially outwardly of the row of crown blocks. Circumferential pitch lengths of directly adjacent crown blocks are greater than circumferential pitch lengths of directly adjacent middle blocks.

In a state in which a pneumatic tire is mounted on a specified rim, inflated to 92% of a specified internal pressure, and loaded with a load of 75% of the maximum load capacity, an average thickness of an undertread rubber is smaller in a center region than in a shoulder region, a ratio (CAO/UAO) is 0.15 or more and 0.95 or less, a ratio (UAI/UAO) is less than 1, and a ratio (L/W) is 0.29 or more and 0.51 or less, in a tire meridian cross-sectional view, where CAO, UAO and UAI are cross-sectional areas of the cap tread rubber, the undertread rubber, and the undertread rubber in the center region, respectively, L is a tire width direction dimension from a defined intersection point to a ground contact edge, and W is a tire width direction dimension of each shoulder region.

A pneumatic tire of the present disclosure includes a tread, wherein the tread includes: a shoulder main groove; a plurality of shoulder slits; and a plurality of shoulder blocks defined by the shoulder main groove and the shoulder slits, the shoulder blocks include inclined portions inclined inward in the tire radial direction from the shoulder blocks toward an outside in the tire axial direction, the inclined portions include: first inclined portions; and second inclined portions having dents dented more inward in the tire axial direction than the first inclined portions, and the first inclined portions are adjacent to each other with one of the shoulder slits interposed between the first inclined portions and the second inclined portions are adjacent to each other with other shoulder slit interposed between the second inclined portions, the one shoulder slit and the other shoulder slit being paired and defining the shoulder blocks.

A pneumatic tire includes a sidewall extending in a tire radial direction, the sidewall comprises a first side block which protrudes outwardly in a tire axial direction, the first side block comprises a first base portion which extends in the tire radial direction, and a first inclined portion and second inclined portion which extend from an inner end in the tire radial direction of the first base portion, the first inclined portion extends increasingly toward a first side in a tire circumferential direction as one proceeds toward an interior in the tire radial direction, and the second inclined portion extends increasingly toward a second side in the tire circumferential direction as one proceeds toward the interior in the tire radial direction.

The present invention provides for a heavy truck tire tread (12) with a plurality of sipes (20) in the shoulder rib (18) that extend from the shoulder edge (14) to the shoulder groove (16). Each one of the sipes (20) has a bottom (28) with a teardrop (30) located at the bottom, and the bottom (28) does not extend the same depth in the thickness direction across the entire lateral length of the sipe (20). The bottom (28) at a middle of the sipe (20) extends for less of a depth in the thickness direction than does the bottom (28) at a shoulder edge (14) portion of the sipe (20) located outboard from the middle of the sipe (20) in the lateral direction. The bottom (28) at the middle of the sipe (20) extends for less of a depth in the thickness direction than does the bottom (28) at a shoulder groove (16) portion of the sipe (20) located inboard from the middle of the sipe (20) in the lateral direction.