Disclosed is a pneumatic tire including: in a tread surface of a tread portion, a pair of main grooves (center main groove and shoulder main groove) arranged side by side in a tire lateral direction and extending in a tire circumferential direction; land portions (middle land portion) defined by the main grooves; a plurality of lug grooves arranged side by side in the tire circumferential direction and bent and folded back, each of the lug grooves including one end communicating with the shoulder main groove, the other end terminating within the middle land portion, and a bending point in a middle of a path from one end to the other end; and sipes extending across the lug grooves, at least one side of the sipe with respect to the lug groove being formed in a zigzag shape.

A pneumatic tire includes a tread portion and a pair of sidewall portions each extending inwardly in a tire radial direction from the tread portion. At least one of the pair of the sidewall portions is provided with at least one side protector protruding outwardly in a tire axial direction. The side protector is provided with a groove, a cut-out portion connected with the groove, and a sipe connected with the groove.

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.

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.

Provided is a 5-rib tire that can have improved steering stability and noise performance A tread portion 2 includes four circumferential grooves 3 and five land portions 4. Two tread ends are ends of a 50%-load ground-contact surface. Each of the five land portions 4 is provided with no groove having a groove width greater than 2.0 mm, and is provided with only sipes 9. The five land portions 4 include a shoulder land portion 11. The shoulder land portion 11 is provided with a plurality of shoulder sipes 20. At least one of the shoulder sipes 20 includes an inclined portion 21 and an axial portion 22. The axial portion 22 cross the tread end.

A tire includes a tread portion including four circumferential grooves extending continuously in the tire circumferential direction and five land portions divided by the four circumferential grooves. The five land portions include a first middle land portion located between a first tread edge and a tire equator. The first middle land portion is provided with first middle sipes inclined with respect to a tire axial direction and fully traversing the first middle land portion in the tire axial direction. Each first middle sipe includes a pair of sipe edges, and at least one of the pair of sipe edges opens at the ground contact surface via a chamfer portion over an entire length thereof. The chamfer portion has a chamfer width increasing continuously from a first longitudinal edge to a second longitudinal edge of the first middle land portion.

A tire having a tread portion that is provided with sipes. Four sipe segments of the sipe include a first sipe segment, a second sipe segment, a third sipe segment, and a fourth sipe segment. At least one of the first sipe segment and the third sipe segment includes, in the cross section orthogonal to the length direction, an oscillated portion which extends in the tire radial direction, while oscillating in the lateral direction orthogonal to the length direction.

A pneumatic tire is provided with, in the tread surface, land portions that include a rib or a plurality of blocks. The land portions are provided with a plurality of narrow shallow grooves and a plurality of recessed portions in a contact patch. Additionally, the opening area ratio Sc of the recessed portions in the central portion region in the tire lateral direction of one continuous contact patch and the opening area ratio Se of the recessed portions in the end portion regions in the tire lateral direction have the relationship Se<Sc, where the central portion region is defined as the region in the central portion in the tire lateral direction occupying 50% of the continuous contact patch of the land portions, and the end portion regions are defined as the regions in the left and right end portions in the tire lateral direction occupying 25%.

A pneumatic tire includes a tread having a pair of crown grooves, a pair of shoulder grooves, a crown land, a pair of middle lands, and a pair of shoulder lands. No grooves having width of 2 mm or more are formed in the crown and middle lands, the tread has first and second halves and has first sipes in the first half such that each has width of less than 2 mm and extends from the crown to shoulder lands via the grooves, second sipes in the second half such that each has width of less than 2 mm and extends from the crown to shoulder lands via the grooves without reaching the ground contact edge, and third sipes in the middle land in the second half such that each has width of less than 2 mm and extends in axial direction between second sipes adjacent in circumferential direction.

The present invention relates to a tire with main kerfs and sub-kerfs, and more particularly, to a tire with main kerfs and sub-kerfs, which maintains drainage performance and running and braking performance by additionally including an auxiliary groove and improves a flow of air and drainage performance by including an auxiliary flow tube.