A tyre comprises a tread portion having a main groove extending continuously in a tyre circumferential direction and a pair of land regions adjacent to the main groove on both sides thereof. At least one of the pair of the land regions has, on an edge thereof facing the main groove, a plurality of main groove side step-like portions each having a height decreasing stepwise in two or more steps from a ground contacting surface of the at least one of the pair of the land regions to a bottom surface of the main groove. The main groove side step-like portions include at least a first main groove side step-like portion and a second main groove side step-like portion having different numbers of the steps from each other.

In a tire, a plurality of outer resonators (25) are formed in an outer land portion (28) partitioned by two outer main grooves (21, 22) and arranged in a tire circumferential direction, a plurality of inner resonators (26) are formed in an inner land portion (29) partitioned by two inner main grooves (23, 24) and arranged in the tire circumferential direction, the outer resonator includes a first vertical groove (31) which extend in the tire circumferential direction, and a first branch groove (32) and a second branch groove (33) which have an inner volume smaller than that of the first vertical groove, extend in the tire width direction from both end portions of the first vertical groove in the tire circumferential direction such that the first branch groove and the second branch groove extend in directions opposite to each other, and are respectively opened to the two outer main grooves, and the inner resonator includes a second vertical groove (36) which extends in the tire circumferential direction, and a third branch groove (37) and a fourth branch groove (38) which have an inner volume smaller than that of the second vertical groove, extend in the tire width direction from the second vertical groove such that the third branch groove and the fourth branch groove extend in directions opposite to each other, and are respectively opened to the two inner main grooves.

A pneumatic tire includes a circumferential main groove extending in a tire circumferential direction in a tread surface of a tread portion, wherein when the circumferential main groove is segmented into an outer side in a tire radial direction and an inner side in the tire radial direction by drawing an imaginary segment line parallel with a straight line connecting each of groove opening edges at a position of ½ of a groove depth in a meridian cross-section, a cross-sectional area SU on the outer side in the tire radial direction and a cross-sectional area SD on the inner side in the tire radial direction satisfy the relationship 0.15≤SD/SU≤0.60.

Tread (1) for a pneumatic tyre, comprising a sequence of tread elements (5) forming an overall “V” shape with two lateral wings (7, 7′), each of said wings being formed from three tread blocks (11, 21, 31) separated therebetween by first and second grooves (15, 16); said three tread blocks (11,21,31) comprise at least one shoulder block (11) provided with at least a first sipe (111) having a “zig-zag” shape; each shoulder block (11) further comprises a channel (112) with a longitudinally evolution which extends on the shoulder block (11), until it reaches and emerges upon the corresponding second groove (15); the channel (112) with a longitudinal evolution comprises an end portion (300, 301) that opens onto said second groove (15), said end portion (300) having a variable depth, said terminal portion having at least one inclined portion (300) wherein the depth gradually decreases from the outside towards the inside of the pneumatic tyre, as the interface with this second groove (15) approaches.

A tire comprises a tread portion 2. The tread portion 2 is provided with at least one main groove 3 extending continuously in a tire circumferential direction. A first groove wall 10, which is one of groove walls of the main groove 3, is provided with at least one first recessed portion 11 recessed outwardly in a groove width direction from a corresponding one of groove edges 6 of the main groove on a ground contacting surface of the tread portion 2. In the first recessed portion 11, a recess amount from the corresponding one of the groove edges 6 gradually decreases toward both sides in the tire circumferential direction from a deepest portion 15 recessed most outwardly in the groove width direction.

A pneumatic tyre includes a tread portion, and a pair of buttress portions each extending inwardly in a tyre radial direction from a respective one of tread edges. At least one of the pair of buttress portions is provided with side protectors protruding outwardly in a tyre axial direction. The side protectors include first protectors arranged in a tyre circumferential direction. Each first protector includes a lateral V-shaped portion including a first inclined element inclined with respect to the tyre circumferential direction and a second inclined element inclined in an opposite direction to the first inclined element with respect to the tyre circumferential direction and connected to the first inclined element.

Provided is a motorcycle pneumatic tire in which the wet grip performance is improved while the steering stability during turning is ensured. The motorcycle pneumatic tire includes, on its ground-contact surface: a first inclined groove (21) that extends on a tire width-direction outer side from the vicinity of a tire equator and is inclined in the same direction as a tire rotation direction; and a short groove (22) that is arranged on the extension of a tire width-direction outer end of the first inclined groove (21). The tire width-direction outer end of the first inclined groove is positioned in the vicinity of a point at ¼ of a tread width (TW) from the tire equator on the tire width-direction outer side, while a tire width-direction inner end of the short groove is positioned in a range of ¼ to 5/16 of the tread width (TW) from the tire equator on the tire width-direction outer side; an inclination angle of the first inclined groove with respect to a tire circumferential direction increases toward the tire width-direction outer side; and an angle θ.sub.A formed by a groove wall of the tire width-direction outer end of the first inclined groove with respect to the direction perpendicular to the tire surface, and an angle θ.sub.B formed by a groove wall of the tire width-direction inner end of the short groove with respect to the direction perpendicular to the tire surface, satisfy a relationship of θ.sub.A>θ.sub.B.

A tire includes a tread portion including a row of blocks arranged in a tire circumferential direction divided by lateral grooves. Each block includes a block tread surface, a first block sidewall surface located on a leading side in a rotation direction of the block, and a leading-side corner portion between the block tread surface and the first block sidewall surface. The leading-side corner portion includes a first portion and a second portion extending in a tire axial direction. The first portion is formed sharper than the second portion. In a plan view of each block, an angle θ1 of the first portion to the tire circumferential direction is larger than an angle θ2 of the second portion to the tire circumferential direction. Each lateral groove has a groove width (A) at the first portion that is larger than a groove width (B) at the second portion.

A tire includes a tread portion that includes a center main groove, an outer main groove provided on an outer side in a tire width direction of the center main groove, and a lug groove extending in a direction intersecting with both main grooves. The center main groove has a zigzag shape in which a first linear portion and a second linear portion are alternately connected. The outer main groove has a zigzag shape in which a long linear portion and a short linear portion are alternately connected. The lug groove has a groove center line intersecting with the short linear portion in the zigzag shape of the outer main groove.

In a tire including a block having an edge along a main groove closer to an equatorial plane and a block having an edge along a main groove farther from the equatorial plane, the angles between an imaginary line extending a ridge line formed by a bend point of a groove wall on the edge side of the main groove and imaginary lines extending each of edges adjacent in a circumferential direction with the edge interposed therebetween are an acute angle (θa) and an obtuse angle (θb), and the angles between an imaginary line extending a ridge line formed by a bend point of a groove wall on the edge side of the main groove and imaginary lines extending each of edges adjacent in the circumferential direction with the edge interposed therebetween are an acute angle (θc) and an obtuse angle (θd), with a relationship (θd−θc)<(θb−θa).