A pneumatic tire includes 100 parts by mass of a rubber component including from 25-30 parts by mass of a diene rubber having a glass transition temperature of from −20° C. to −40° C., having a tertiary amine having an epoxy group as a modifying group, and a vinyl content from 35-45 mass %, 20-35 parts by mass of a diene rubber obtained by reacting a polyorganosiloxane to an active terminal of a diene-based polymer chain having the active terminal formed by making a polymer block A continuous with a polymer block B, the polymer block A including 80-95 mass % of isoprene and 5-20 mass % of an aromatic vinyl, having an active terminal, and having a weight average molecular weight from 500-15,000, the polymer block B including 1,3-butadiene and an aromatic vinyl and an active terminal, the vinyl content lower by from 5-25 mass % than that of the first conjugated diene polymer.

A pneumatic tire is provided in which each of sipes has a leading-side edge and a trailing-side edge. A chamfered portion that is shorter than a sipe length of the sipe is formed on each of the leading-side edge and the trailing-side edge. The sipe includes, at sections facing the chamfered portions, non-chamfered regions in which other chamfered portions are not present. Both end portions of the sipe are terminated inside a rib. A maximum depth x (mm) of the sipe 11 and a maximum depth y (mm) of the chamfered portion 12 satisfy a relationship x×0.1≤y≤x×0.3+1.0. A sipe width of the sipe is constant in a region between an end portion of the chamfered portion positioned on an inner side in the tire radial direction and a groove bottom of the sipe.

Tire comprising a tread (1) having sipes (5) having a non-zero inclination with a plane perpendicular to the tread surface (10). The tread is an elastomer compound based on natural rubber or synthetic polyisoprene with a majority of cis-1,4 linkages, the natural rubber or the synthetic polyisoprene in case of a blend being present in a majority amount relative to the amount of the other diene elastomer(s) used and on a reinforcing filler consisting predominantly of silica, with a content expressed in phr (parts by weight per hundred rubber) of greater than 40 and an overall filler content expressed in phr of greater than 50, this material having a tan(δ)max/(G*25%) ratio at most equal to 0.065, in which tan(δ)max is the measurement, at 60° C., of the loss factor of the material of which the tread is made, and G*25% is the complex dynamic shear modulus, expressed in MPa, of this material, and a deformation at break which is at least equal to 530%, this value being obtained at a temperature of 60° C.

A tyre includes a crown land portion, an outboard middle land portion, an outboard shoulder land portion, an outboard crown circumferential groove, an outboard shoulder circumferential groove, an inboard middle land portion, an inboard shoulder land portion, an inboard crown circumferential groove, and an inboard shoulder circumferential groove. The outboard middle land portion is provided with full-opened outboard middle sipe that are inclined to a tyre axial direction. The outboard middle sipes each have two opposite sipe-edge portions provided with chamfer portions. In each chamfer portion of each outboard middle sipe, chamfer widths at both ends of the outboard middle sipe are larger than a chamfer width of a central portion of the outboard middle sipe. The outboard shoulder land portion is provided with outboard shoulder sipes that are inclined in the same direction as the outboard middle sipes to the tyre axial direction.

A tire comprises a tread portion. The tread portion is provided with a sipe. The sipe comprises four sipe segments: a first sipe segment, a second sipe segment, a third sipe segment, and a fourth sipe segment. At least one of the first sipe segment and the third sipe segment comprises an oscillated portion which extends in the radial direction of the tire, while oscillating in a lateral direction orthogonal to the length direction of the sipe in a cross section of the sipe orthogonal to the length direction. Each of the first sipe segment and the third sipe segment comprises the oscillated portion including an oscillating-start portion, and the oscillating-start portion of the first sipe segment is inclined with respect to the tire radial direction in the same direction as the oscillating-start portion of the third sipe segment.

A tire comprises a tread portion provided with two circumferential grooves disposed one each side of the tire equator and extending continuously in the tire circumferential direction, and a crown land region between the two circumferential grooves. The crown land region is provided with first crown sipes extending from one of the circumferential grooves and terminating within the crown land region, and second crown sipes extending from the other circumferential groove and terminating within the crown land region.

Each sipe wall surface of a sipe in a tread portion of a pneumatic tire includes, along a sipe depth direction, multiple ridge portions and at least one valley portion bending like waves. Where viewed along the sipe depth direction, a recess depth of the valley portion with respect to the ridge portion on one wall surface varies depending on a position in the extension direction, the valley portion extends from a position at which the recess depth is maximized toward a position at which the recess depth is minimized, and the recess depth decreases as the valley portion extends from the side of the maximum-depth valley portion toward the maximum ridge portion. The sipe is provided in at least one of a first half-tread region on a first side or a second half-tread region on a second side in a tire width direction.

Provided is pneumatic tire in which a land portion includes a width direction sipe extending in a tread width direction, the width direction sipe includes, in a cross section along a depth direction, a linear portion extending from an opening of the width direction sipe toward a bottom of the width direction sipe, and a bent portion connected to the linear portion, bending and extending from a connecting portion with the linear portion to the bottom of the width direction sipe, and the linear portion of the width direction sipe has a length in the depth direction increasing as the linear portion extends from a center portion of the width direction sipe in the tread width direction toward an end portion in the tread width direction.

By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.

A first tire includes a tread having a circumferential center rib and a circumferential intermediate rib laterally adjacent the center rib, the intermediate rib being separated from the center rib by a first circumferential groove, a second circumferential rib bordering the intermediate rib opposite the first circumferential groove, the tread further including two other circumferential grooves; at least one stiffener element disposed within each of the four circumferential grooves, the stiffener elements having a reduced height relative to a height of the center and intermediate ribs; and the stiffener element having a circumferentially oriented cut extending into an upper surface of the stiffener element toward a bottom of the stiffener element, the cut extending circumferentially through the stiffener element with the cut bounded by opposite laterally inward facing cut sides.