A tread for a tire includes: a first tread zone extending circumferentially, continuously, and entirely around the tire, the first tread zone being formed of a first compound; a second tread zone extending circumferentially, continuously, and entirely around the tire, the second tread zone being formed of a second compound different from the first compound; and a boundary groove axially separating the first tread zone from the second tread zone, the first tread zone, the second tread zone, and the boundary groove entirely forming the tread, the boundary groove having an axial centerline disposed an axial distance from an equatorial plane of the tire. The first tread zone has a first circumferential groove and a sidewall portion defining an intermediate circumferential rib of the first tread zone and a shoulder circumferential rib of the first tread zone.

Provided is a pneumatic tire. At least one land portion is defined and formed by a plurality of circumferential main grooves provided in a tread surface. A main sipe including a body portion and a chamfered portion is formed in at least one side of the body portion. A branch sipe branching from the chamfered portion is provided. The depth of the body portion is equal to or greater than the depth of the branch sipe.

In a pneumatic tire, a block includes recess/protrusions on a road contact surface. Additionally, a recess/protrusion content 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 μm. 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 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 tire comprises a tread portion 2. The tread portion 2 comprises a plurality of blocks each comprising a first longitudinal edge 18 and a second longitudinal edge 19 extending in a tire circumferential direction, and a ground contacting surface defined therebetween. The blocks include a first block 20 having a first narrow groove 21 provided in the ground contacting surface thereof. The first narrow groove 21 extends from a first end 21a on the first longitudinal edge 18 toward a center 24 in a tire axial direction of the first block 20 and curves within the ground contacting surface and reaches a second end 21b on the first longitudinal edge 18 so as to extend in a laterally oriented V-shape.

A pneumatic tire is provided with, in the tread surface, land portions that include 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. The opening area ratio Se′ of the recessed portions in the end portion regions in the tire circumferential direction of one continuous contact patch and the opening area ratio Sc′ of the recessed portions in the central portion region in the tire circumferential direction have the relationship Sc′<Se′, where the central portion region is defined as the region in the central portion in the tire circumferential direction occupying 50% of the continuous contact patch, and the end portion regions are defined as the regions in the front and back end portions in the tire circumferential direction occupying 25%.

A pneumatic tire includes alternating first and second groove portions. The first groove portion intersects an equator and extends in a width direction. The second groove portion inclines from the first groove portion to a tread edge at a smaller angle relative to a circumferential direction than an angle of the first groove portion relative to the circumferential direction. The first groove portion communicates with the second groove portion of the lug groove adjacent in the circumferential direction. The first groove portion is on a stepping side of each lug groove. The second groove portions are curved or bent and an average angle of the second groove portions in an inner region is smaller than in an outer region. Shallow grooves having a bent point are formed on blocks. The blocks are defined by circumferential narrow grooves connecting the second groove portions adjacent in the circumferential direction and the lug grooves.

A tire includes a tread portion including a first land portion defined between circumferentially extending first and second edges. The first land portion is provided with first and second lateral grooves respectively extending from the first and second edges and terminating within the first land portion and a circumferentially extending first longitudinal narrow groove in communication with the first and second lateral grooves. Each of the first and second lateral grooves includes a wide-width portion and a narrow-width portion. The wide-width portion of each of the first lateral grooves extends from the first edge and the wide-width portion of each of the second lateral grooves extends from the second edge. The first longitudinal narrow groove passes through the narrow-width portion of each of the first and second lateral grooves without passing through the wide-width portion of each of the first and second lateral grooves.

A tread for a tire includes: a first tread zone extending circumferentially, continuously, and entirely around the tire, the first tread zone being formed of a first compound; a second tread zone extending circumferentially, continuously, and entirely around the tire, the second tread zone being formed of a second compound different from the first compound; and a boundary groove axially separating the first tread zone from the second tread zone, the first tread zone, the second tread zone, and the boundary groove entirely forming the tread, the boundary groove having an axial centerline disposed an axial distance from an equatorial plane of the tire. The first tread zone has a first circumferential groove and a sidewall portion defining an intermediate circumferential rib of the first tread zone and a shoulder circumferential rib of the first tread zone.

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. The opening area ratio Se of the recessed portions in the end portion regions in the tire lateral direction of one continuous contact patch and the opening area ratio Sc of the recessed portions in the central portion region in the tire lateral direction have the relationship Sc<Se, 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%.