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.

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 pneumatic tire includes a shoulder land defined by a circumferential groove having a width of ≥3 mm on a tread and width-direction grooves in the shoulder land. The width-direction grooves include lug grooves having a width at a position at a center of the shoulder land in the width direction of ≥1.5 mm and a depth of ≥50% of a maximum depth of the width-direction grooves on a circumference. Blocks defined by the lug grooves have circumferential lengths varying at the position. A maximum-to-minimum ratio of circumferential lengths of the blocks is ≥1.2 and ≤1.8. The number of blocks on the circumference is N, the circumferential lengths of the blocks are sequentially P.sub.1, P.sub.2, . . . , P.sub.N, the circumferential length of any block is P.sub.i (i=1 to N), the number of blocks satisfying P.sub.i/min(P.sub.i−1, P.sub.i+1)≤0.95 is M.sub.1, the number of blocks satisfying 2P.sub.i/(P.sub.i−1+P.sub.i+1)≤0.95 is M.sub.2, an index R satisfies 0≤R=((M.sub.1.Math.M.sub.2).sup.1/2/N)≤0.2.

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 tire includes a pair of shoulder land regions each provided with a plurality of wavy sipes and first shoulder lateral grooves each having a groove width of 2 mm or less and larger than a width of each of the wavy sipes. The tire further includes a pair of middle land regions and a crown land region each provided with a plurality of non-wavy sipes.

Various embodiments of a tire having a three-dimensional tire sipe are disclosed. In one embodiment, a tire sipe used in a tire is provided, the tire sipe comprising: a radially inner sipe taper portion having a radially inner sipe width W3 and a radially inner sipe transition width W4, wherein the radially inner sipe width W3 is greater than the radially inner sipe transition width W4; a radially outer sipe taper portion having a radially outer sipe width W1 and a radially outer sipe transition width W2, wherein the radially outer sipe width W1 is greater than the radially outer sipe transition width W2; and a sipe radially central portion having a plurality of individual sipe radially angled portions oriented in a zig-zag pattern, wherein the sipe radially central portion is oriented radially between the radially inner sipe taper portion and the radially outer sipe taper portion.

Crown of a tire for a heavy vehicle that is desensitized to attacks. The tire (1) comprises tread (2) having a median degree of surface siping TL.sub.C, expressed in m/m.sup.2, equal to the ratio between the cumulative length L.sub.DC of the cuts (21), present in a median portion of tread of axial width W.sub.C, and the median area A.sub.C of the radially outer surface (23) of the tread (2), and protective reinforcement (4) comprising at least two protective layers (41, 42) that are formed of elastic metallic reinforcers and have a maximum breaking strength R.sub.max, expressed in daN/m, such that the median degree of surface siping TL.sub.C of tread (2) is at least equal to 5 m/m.sup.2 and a coupling ratio C.sub.C, equal to the ratio between the maximum breaking strength R.sub.max and the median degree of surface siping TL.sub.C, is at least equal to 18 000 daN.

A tread (10) for a tire (1) having a plurality of tread components (20) comprising a sipe (100) defining first (101) and a second (102) opposing faces; the said sipe (100) having a sipe depth (P) and comprises in sequence, from a radially external position to a radially internal position, a first (A) and a second (C) section, wherein an intermediate section (B) links said first (A) and second (C) section and wherein said first (101) and second (102) opposing faces define first profiles (101a, 102a) along said first section (A) with a plane (γ) orthogonal to a longitudinal extension direction (L) of said sipe (100), said first profiles (101a, 102a) presenting a pattern such as to intersect a straight line lying in said orthogonal plane (y) in at least two distinct points, and define second profiles (101c, 102c) along said second section (C) with said orthogonal plane (y), said second profiles (101c, 102c) presenting a substantially rectilinear pattern; said first (101) and second (102) opposing faces- are continuously and increasingly spaced apart between a minimum depth

A run-flat tire includes: sipes formed in blocks; a belt reinforcing layer on an outer side in a radial direction of a belt layer; and a side reinforcing rubber in sidewall portions, wherein a density of the sipes in a center block is from 0.10 cords/mm or greater to 0.30 cords/mm or smaller, the belt reinforcing layer includes a center reinforcing portion in which more center reinforcing portions are stacked at a center region than at positions other than the center region, a width Wc of the center reinforcing portion is within 0.5 Gr≤Wc≤2.5 Gr with respect to a thickness Gr of the side reinforcing rubber at the tire maximum width position, and an average width of the width Wc of the center reinforcing portion is from 50% or greater to 90% or smaller of a width of the center block.