Tire with radial carcass reinforcement having a tread of thickness E, this tread having a tread surface and at least one cut opening onto the tread surface to form edge corners. The cut extends into the tread over a total depth H. The cut is in the form of a sipe having a width D. There is also formed, in the vicinity, i.e. at a minimum distance from the said edge corner that is at most equal to five times the width D of the cut, of at least one edge corner of this cut and on the tread surface, at least one cavity having a depth h that is small in comparison with the depth of the cut, i.e. that is at most equal to 30% of the depth H. The at least one cavity reduces the compression rigidity of the tread in the vicinity of the the at least one edge corner.

A tire includes a tread portion. The tread portion has a main groove extending continuously in a tire circumferential direction, and a land portion adjacent to the main groove. The land portion has lateral grooves extending from the main groove in a tire axial direction. Each of the lateral grooves has a first portion communicating with the main groove, and a second portion connected to the first portion. The first portion has a larger groove width than the second portion and has a smaller groove depth than the second portion.

A tyre for running on rough terrain includes a tread portion. The tread portion includes a crown region, middle regions, and shoulder regions. The crown region is provided with a plurality of crown blocks. The middle regions are provided with a plurality of middle blocks. The shoulder regions are provided with a plurality of shoulder blocks. Each of the middle blocks is connected with at least one of the crown blocks by a crown tie bar and connected with at least one of the shoulder blocks by a shoulder tie bar. A land ratio of the shoulder regions is 90% or more and 115% or less of a land ratio of the crown region.

In regions, divided by the tire equator, on both sides of the tread surface of a tire, the tire includes a grip area along the entire circumference of the tread, the grip area including a plurality of recessed lines, with a shape recessed toward an inner side of the tire from the outline of the tread surface, that extend from the tread edge side in a direction inclined relative to the tire equator and are arrayed in parallel, and a plurality of sipes that extend toward the tire equator in a direction inclined relative to the tire equator, starting in the grip area and terminating before the tire equator. The negative ratio in the grip area is higher than the negative ratio closer to the tire equator than the grip area.

In a pneumatic tire, a block includes recess/protrusions on a road contact surface. Additionally, a recess/protrusion height of the recess/protrusions is from 0.1 mm to 1.0 mm. A width of the recess/protrusions is from 0.1 mm to 0.8 mm. A recess/protrusion region is where an arrangement interval between adjacent recess/protrusions is not greater than 1.2 mm. A smooth region other than the recess/protrusion region has an arithmetic mean roughness of the road contact surface of the block not greater than 50 m. A lateral length of the road contact surface of the block in a tire lateral direction is defined. In this case, the block includes the recess/protrusion region and the smooth region in an optional cross-section in a lateral range of not less than 40% of a lateral length of the road contact surface of the block.

A tire comprises a tread portion provided with at least one main groove extending continuously in the tire circumferential direction to axially divide the tread portion into land portions. The land portion is provided with axial grooves extending thereacross in the tire axial direction, and each comprising a radially outer portion and a radially inner portion which is wider than the radially outer portion. The radially outer portion of each of the axial grooves is crossed by one ore more sipes.

A tire includes four zigzag circumferential grooves and hexagonal blocks divided by the lateral grooves each extending so as to connect between adjacent ones of the zigzag circumferential grooves. The zigzag circumferential grooves include a pair of center circumferential grooves each having a groove width not more than 4.0 mm and a pair of shoulder circumferential grooves each having a groove width larger than that of each of the center circumferential grooves. A depth of each of the lateral grooves is smaller than a depth of each of the zigzag circumferential grooves, and a groove bottom of each of the lateral grooves is provided with a first sipe.

A pneumatic tire includes a center land portion (30), a mediate land portion (35), a shoulder land portion (40), and shallow grooves (33, 38, and 43) on a surface of each of the land portions (30, 35, and 40), in which the shallow grooves (33 and 43) in the center land portion (30) and the shoulder land portion (40) have many components in a circumferential direction of the tire, and the shallow grooves (38) in the mediate land portion (35) have more components in a tire width direction than the shallow grooves (33 and 43) in the center land portion (30) and the shoulder land portion (40).

The pneumatic tire includes a plurality of ribs formed by a plurality of main grooves extending in a tire circumferential direction and connected to each other in the tire circumferential direction. The shoulder rib positioned on either side in a tire width direction of the ribs includes a first sipe configured to open to a ground contact surface and an outer side surface on a rib end side, and a second sipe positioned on an inner side in a tire radial direction of the first sipe and configured to open to the outer side surface.

A tread for a tire includes a first circumferential groove extending in a circumferential direction of the pneumatic tire, a second circumferential groove extending in the circumferential direction of the pneumatic tire, a third circumferential groove extending in the circumferential direction of the pneumatic tire, and a fourth circumferential groove extending in the circumferential direction of the pneumatic tire. The first, second, third, and fourth circumferential grooves defining first, second, third, fourth, and fifth ribs. The first and fifth ribs include lateral grooves and incisions extending circumferentially fully around the first and fifth ribs. The incisions of the first and fifth ribs reduce noise generated by the tread under operating conditions.