A pneumatic tire includes a tread surface, a plurality of circumferential main grooves formed on the tread surface and extending in a tire circumference direction, a plurality of lug grooves formed on the tread surface and extending in a tire lateral direction, a plurality of blocks defined by the lug grooves on both sides in the tire circumferential direction and by the circumferential main grooves on at least one end in the tire lateral direction, and narrow grooves formed in the blocks. The narrow grooves include a plurality of bent portions as well as a circumferential narrow groove extending in the tire circumference direction and a lateral narrow groove extending in the tire lateral direction. The lateral narrow groove and the circumferential narrow groove are configured so that at least one thereof is provided in a plurality and includes a plurality of intersection points where the one intersects the other.

In a pneumatic tire, a lug groove is configured so that a portion thereof defining a leading side of a block in a rotation direction is inclined toward a trailing side in the rotation direction as that portion extends outward in a lateral direction from an equator line side. Among small blocks defined in the block by narrow grooves, a small block adjacent to the lug groove defining the leading side of the block in a rotation direction, and to a circumferential main groove defining the equator line side is a leading-side block, and a small block with a portion positioned on a backmost side of the block in the rotation direction is a trailing-side block. Among the small blocks, the trailing-side block has a greater surface area than that of the leading-side block, and intermediate blocks each have a greater surface area than the trailing-side block.

A tire including, in a tread surface (12), a plurality of shoulder main grooves extending in a tire circumferential direction, a plurality of lug grooves (351) extending in a direction intersecting the shoulder main groove, and a plurality of blocks B defined by the shoulder main grooves and the lug grooves (351). The tread surface (12) of the block B includes circumferential narrow grooves (352) each extending in the tire circumferential direction and a plurality of sipes that are provided on both sides of the circumferential narrow grooves in a tire width direction so as to be separated from the circumferential narrow grooves (352) and are disposed side by side in the tire circumferential direction and extend in the tire width direction. The circumferential narrow groove (352) includes a shallow bottom portion (3521) and a deep bottom portion (3522) having different depths from the tread surface (12). The deep bottom portion (3522) has a depth from the tread surface (12) deeper than a depth of the shallow bottom portion (3521) and is provided in a central portion of the block B in the tire circumferential direction.

A pneumatic tire includes blocks (36 and 41) formed by main grooves (10 and 15) extending in a circumferential direction of the tire and lateral grooves (20 and 25) extending in a tire width direction, and notches (50, 60, and 70) in stepped side end portions of the blocks (36 and 41). The lateral grooves (20 and 25) extend obliquely such that a tire grounding end (E) side is grounded later. Portions adjacent to the notches (50, 60, and 70) on the tire grounding end (E) side of the notches (50, 60, and 70) are protrusions (51, 61, and 71) protruding while forming an acute angle toward a tire equator (C) side.

To obtain a uniform ground contact pressure distribution in a pneumatic tire in which an edge portion of a land portion is provided with a notch portion. In a pneumatic tire according to an embodiment, an edge portion of a land portion formed in a tread portion is provided with a notch portion having a triangular shape in the plan view. A wavy sipe is provided to extend from an apex corner portion of the notch portion into the land portion and a straight sipe is provided adjacent to the wavy sipe with a gap interposed therebetween to extend into the land portion and to open to the edge portion of the land portion.

Provided in a tread portion of a tire are main grooves, lug grooves intersecting the main grooves, and land portions defined by the main grooves. A specific one of the land portions includes, in a ground contact surface, sipes and narrow grooves intersecting the main grooves, the narrow grooves having a depth of 1.50 mm or less. When extending from one side toward another side in the width direction, the sipes and the narrow grooves have different directions extending in the circumferential direction in the central region and have the same direction extending in the circumferential direction in both edge regions on an outer side from the central region in the width direction. The specific one of the land portions includes at least one land portion on the outer side in the width direction.

A tire includes a tread portion. The tread portion includes a pair of shoulder main grooves and a plurality of crown blocks. Each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction. The main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

A tire has a tread including: a first circumferential groove which is closest to a center in a tire width direction among a plurality of circumferential grooves; center land portions placed adjacent to the first circumferential groove at a side near the center in the tire width direction, and a lug groove which extends between a plurality of the center land portions, and which opens to a side near the first circumferential groove. A bridge having a bottom surface which is bulged is formed at a portion of the lug groove near the first circumferential groove. The bridge has a cross-sectional shape of a trapezoid with tapered surfaces in which side surfaces of the lug groove at an end near a center in a longitudinal direction and an end near the first circumferential groove are inclined with heights thereof reduced toward corresponding ends of the bridge.

A tire according to an embodiment has a tread including a circumferential groove, and a lug groove connected to the circumferential groove and extending from a first side in a tire width direction to a second side. The tire includes two first raised portions formed in the circumferential groove on a groove bottom at a positions either side of an end of the lug groove on a side near the circumferential groove, a second raised portion formed on a groove bottom of a portion of the lug groove on a side near the circumferential groove, and a third raised portion formed at an intersection of the circumferential groove with an extension of the lug groove, on at least a part of a groove bottom of a portion surrounded in three directions by the two first raised portions and the second raised portion.

A tire comprises a tread portion comprising a shoulder land region provided with shoulder lateral grooves and circumferential sipes connecting between the shoulder lateral grooves. The shoulder lateral grooves are each provided with a chamfer. The circumferential sipes are each spaced apart from an axially inner end of the shoulder land region by an axial distance of from 30% to 100% of an axial width of the shoulder land region. The depths of the circumferential sipes are equal to or greater than the groove depths of the shoulder lateral grooves.