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.

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 pneumatic tire includes chamfered sipes in a land portion each including a chamfered portion, and non-chamfered sipes in the land portion each not including the chamfered portion. The chamfered sipe includes one end communicating with the main groove that defines the land portion and the other end terminating within the land portion. The chamfered and non-chamfered sipes are alternately disposed in the circumferential direction. Of the non-chamfered sipes on both sides in the circumferential direction of the chamfered sipe, a relationship between a distance a and a distance b is in the range 1.5≤(b/a)≤12, where the distance a is between the chamfered sipe and a near sipe corresponding to the non-chamfered sipe located on a side closest to the chamfered sipe, and the distance b is between the chamfered sipe and the non-chamfered sipe located further from the chamfered sipe in the circumferential direction.

A tire includes a tread portion being provided with a first circumferential groove extending continuously in the tire circumferential direction, and a first land portion adjacent to the first circumferential groove. The first land portion includes a ground contact surface, a land sidewall on a first circumferential groove side, and a recess that opens across both the ground contact surface and the land sidewall. The recess has an opening defined by a V-shaped first edge and a V-shaped second edge respectively extending on the ground contact surface and the land sidewall. The recess has a circumferential maximum length L1 of from 6.0 to 9.0 mm. The recess has a maximum depth d1 of from 15% to 40% of a maximum depth of the first circumferential groove. The recess has an axial maximum length L2 of from 3.0 to 5.0 times the depth d1.

In a tire, an outermost circumferential groove is on the outermost side in the width direction, a center land portion and center lug grooves are on an inner side of the outermost circumferential groove in the width direction, the center lug grooves include an end opening to the outermost circumferential groove, a width-direction sipe and a circumferential sipe are on an individual side of both sides in the circumferential direction of a center lug groove of an individual pair of the center lug grooves adjacent in the circumferential direction, the width-direction sipe includes one end opening to the outermost circumferential groove to which the center lug groove opens and the other end terminating within the center land portion, and the circumferential sipe includes one end opening to the center lug groove and the other end terminating near the width-direction sipe or communicating with the width-direction sipe.

A tire includes a tread portion including a first tread edge, a first shoulder circumferential groove, and a first shoulder land portion demarcated by the first shoulder circumferential groove to include the first tread edge. The first shoulder land portion is provided with first shoulder lateral grooves extending from the first shoulder circumferential groove to the first tread edge. One of the first shoulder lateral grooves includes first and second groove walls which face each other, and a tie-bar. The tie-bar includes an outer surface extending along a ground contact surface of the first shoulder land portion, the outer surface being connected to the first and second groove walls. The outer surface includes a first edge connected to the first groove wall, and a second edge connected to the second groove wall, the second edge having a length smaller than a length of the first edge.

A tire includes a tread portion including a first shoulder land portion provided with first shoulder lateral grooves extending from a first tread edge to a first shoulder circumferential groove, a second shoulder land portion provided with second shoulder lateral grooves extending from a second tread edge and terminating within the second shoulder land portion, a first middle land portion provided with first middle lateral grooves extending from the first shoulder circumferential groove and terminating within the first middle land portion, a second middle land portion provided with outer and inner second middle lateral grooves respectively extending from the second crown circumferential groove and the second shoulder circumferential groove and terminating within the second middle land portion, and a crown land portion provided with crown lateral grooves extending from the first crown circumferential groove and terminating within the crown land portion.

A pneumatic tire includes a tread; sidewalls; and beads. The tread includes main grooves, including a center main groove extending in a tire circumferential direction and a pair of shoulder main grooves extending in the tire circumferential direction, and land portions defined between the main grooves. At least one of the land portions includes lug grooves extending from at least one of the main grooves defining the at least one of the land portions and terminating within the at least one of the land portions. At least one of the lug grooves includes a raised bottom portion that is shallower than a groove bottom at a portion on an opening end side and a communicating portion that extends in a longitudinal direction of the at least one of the lug grooves following the raised bottom portion and is deeper than the raised bottom portion.

In a pneumatic tire, a groove depth H1 of each of first and second inclined lug grooves over an entire region from an opening portion to a corresponding one of first or second circumferential main grooves to a terminating end portion within a center land portion has a relationship with a maximum groove depth Hg of the corresponding one of the first or second circumferential main grooves represented by 0.80≤H1/Hg≤1.00. Additionally, a maximum groove depth H2 of each of first and second lateral grooves has a relationship with a groove depth H1e at a terminating end portion of the corresponding one of the first and second inclined lug grooves represented by 0.70≤H2/H1e≤0.90.

A tire includes first through fourth chamfered portions where tire width direction dimensions change in a tire circumferential direction formed along respective vehicle mounting outer edges of first through fourth circumferential main grooves. A second inclined groove adjacent to a vehicle mounting outermost position of the second chamfered portion is formed. A third inclined groove adjacent to a vehicle mounting outermost position of the third chamfered portion is formed. At least one circumferential narrow groove extending in the tire circumferential direction is formed in at least one of a first land portion and a second land portion.