A tyre includes a tread portion including a tread surface which is provided with grooves. At least one of the grooves includes a widening-width portion at least partially. The widening-width portion includes a first groove portion extending inwardly in a tyre radial direction from the tread surface, and a second groove portion located inwardly in the tyre radial direction of the first groove portion and having a groove width greater than that of the first groove portion.

In a pneumatic tire are defined: a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread portion, a second imaginary line VL2 passing through a bottom portion of a shoulder main groove and parallel to VL1, an intersection point between VL2 and a surface of a shoulder land portion outward of a ground contact edge T in a lateral direction, and an equatorial plane CL. Given A as a distance in the lateral direction between an intersection point P and CL, B as a groove depth of the shoulder main groove, and C as a distance in the lateral direction between T and CL, 0.80≤(B+C)/A≤1.15 is satisfied and, given E as a distance in the lateral direction between the bottom portion of the shoulder main groove and P, 2.0≤E/B≤5.0 is satisfied.

A tire 2 includes a tread 4 on which at least three circumferential grooves 24 continuously extending in a circumferential direction are formed, and a belt 14 located radially inward of the tread 4. A ratio of a center stretch, at a center portion of the belt, indicated by the follow/Mg formula (2) to a shoulder stretch, at an end portion of the belt, indicated by the following formula (1) is not less than 1 and not greater than 3, and the shoulder stretch is not less than 1%.

(Shoulder stretch)

100×(Rsa−Rsb)/Rsb  (1)

(Center stretch)

100×(Rca−Rcb)/Rcb  (2)

A heavy-duty tire includes a tread portion including a pair of tread edges and a tire equator located therebetween. In a tire cross-section including a tire axis under a 5% inner pressure condition where the tire is mounted on a standard wheel rim with 5% of a standard pressure but loaded with no tire load, the tread portion has a profile which includes a first profile including the tire equator, a pair of second profiles extending axially inwardly from the tread edges and a pair of third profiles connecting the first profile and the respective second profiles. The first profile and the second profiles are configured as arc shapes protruding outwardly in a tire radial direction, and the third profiles are configured as straight shapes.

A pneumatic tire is provided with tread rubber that forms a contact patch; and a belt layer which is disposed toward the interior in a tire radial direction from the tread rubber. A shoulder lug portion is provided with a narrow groove that partitions the shoulder lug portion into a main body portion and into a sacrificial portion. A plurality of concavities are open toward both the contact patch at the main body portion and the groove side face, wherein innermost ends in the tire width direction of the respective concavities are disposed so as to be at the same location in the tire width direction as an outermost end in the tire width direction of the belt layer or are arranged toward the exterior in the tire width direction from the outermost end in the tire width direction of the belt layer.

In a pneumatic tire, a land portion is formed in a tread surface of a tread portion on an outermost side in a tire lateral direction by a circumferential groove extending in a tire circumferential direction, and a ground contact edge is present in the land portion. The land portion includes a plurality of lug grooves provided in the tire circumferential direction and intersecting the ground contact edge, and an intersecting narrow groove provided outward of the ground contact edge in the tire lateral direction and intersecting a lug groove of the plurality of lug grooves.

A heavy duty tire includes a recess portion that is formed in a buttress portion and that opens toward a tire outside, and a first air entry and exit promotion portions, each of which is linked to a side portion of the recess portion, that is open toward the tire outside, and that includes a slope from a surface of the tire toward a bottom portion of the recess portion, such that a depth dimension from the tire surface gradually increases. An average incline angle of the slope with respect to the tire surface is no greater than 45°, and air entry and exit promotion portions are disposed at two or more locations.

A heavy duty tire includes a recess portion that is formed in a buttress portion, that opens toward a tire outside, and that includes a bottom portion, and a first air entry/exit promotion portion configured to promote entry and exit of air with respect to the bottom portion, and that includes a slope running from the bottom portion toward a tire surface such that a depth of the slope from the tire surface gradually decreases. A width dimension of the first air entry/exit promotion portion on a recess portion side is set smaller than a width dimension of the air entry/exit promotion portion on the opposite side to the recess portion.

It is provided a pneumatic tyre, the tyre having a circumferential direction, an axial direction and an equatorial plane, and the tyre comprising: a tread extending in a tyre circumferential direction, said tread comprising at least one circumferential groove running continuously in the circumferential direction, and a plurality of axial grooves or transverse grooves running at an angle to the axial direction, and a plurality of blocks defined by the circumferential groove and the axial grooves or transverse grooves, said blocks extending radially between an inner surface of the tread and a tread surface to come into contact with the ground, wherein at least some of the blocks comprise at least one wavy groove that extends from a circumferential groove inwardly into the block, and wherein the wavy groove has a depth extending radially from the tread surface to come into contact with the ground towards the inner surface that ends above the inner surface (26) of the tread.

A pneumatic tire has a tread portion provided with shoulder blocks arranged along the tread edges and each having a side surface extending radially inwardly from the tread edge. The side surface includes a first surface section and a second surface section arranged in the tire circumferential direction and protruding outward of the tire than the groove bottom surfaces of the shoulder lateral grooves. In a tire meridian section including the first surface section, the profile line of the first surface section extends from the tread edge to a position corresponding to a position of the radial inner ends of the shoulder lateral grooves. In a tire meridian section including the second surface section, the profile line of the second surface section extends from the tread edge to a position corresponding to the above-said position of the radial inner ends through a path inward of the tire than that of the profile line of the first surface section.