A tread for a tire includes a first circumferential main groove; a second circumferential main groove; a third circumferential main groove; and a fourth circumferential main groove. The fourth circumferential main groove has a stabilizing structure for increasing tread stiffness. The stabilizing structure is axially offset a predetermined amount from a centerline of the fourth circumferential main groove. The fourth circumferential main groove has an angled axially inner sidewall, an angled axially outer sidewall, and a curved base surface. The stabilizing structure extends radially inward from the curved base surface of the fourth circumferential main groove.

A tread for a tire includes a first circumferential main groove, a second circumferential main groove, a third circumferential main groove, and a fourth circumferential main groove. The fourth main groove has a stabilizing structure for increasing tread stiffness. The stabilizing structure has a circumferentially extending subgroove in a radially innermost bottom of the fourth circumferential main groove. The subgroove is axially offset a predetermined amount from a centerline of the fourth circumferential main groove.

A tire having a tread portion provided with a first circumferential groove and a second circumferential groove each extending in the tire circumferential direction, and lateral grooves connecting between the first circumferential groove and the second circumferential groove. The first circumferential groove extends zigzag and comprises a radially outer first portion having the smallest width and a radially inner second portion having a width larger than that of the first portion.

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 groove of tire thread having a plurality of first and second portions, each delimited by facing walls spaced apart by a maximum width measured at the tread surface and approaching one another such that, at a depth between 20 and 80% of the total depth they are spaced apart by a width less than the maximum width or facing walls spaced apart by a minimum width measured at the tread and diverge from one another such that, at a depth between 20% and 80% of the total depth of the groove, they are spaced apart from one another by a width greater than the width. A plurality of first and second portions of groove so as to form a continuous passage between all the portions of groove in order to allow liquid to flow in the groove regardless of the level of wear.

A pneumatic tire has an asymmetrical tread pattern and a designated vehicle mounting direction. A sipe includes a leading-side edge and a trailing-side edge, each provided with a chamfered portion shorter than a length of the sipe, and a non-chamfered region where other chamfered portions do not exist disposed in an area opposite the chamfered portion. The sipe has a maximum depth x (mm) and the chamfered portion has a maximum depth y (mm) that satisfy x×0.1≤y≤x×0.3+1.0. The sipe has a constant width in a range from an end portion of the chamfered portion positioned inward in a tire radial direction to a groove bottom of the sipe. A groove area of the chamfered portions and the sipes included within a ground contact region is greater on a vehicle mounting inner side than on a vehicle mounting outer side.

A pneumatic vehicle tire for utility vehicles has a profiled tread having two circumferential ribs that are adjacent and are separated by a circumferential groove of depth H formed from radially inner and outer extension sections of height H.sub.1 and H.sub.2. The groove in the radially inner extension section is a channel of height H.sub.1 and breadth B.sub.1, and in the outer extension section is configured, along its circumferential extent, with an alternating sequence of first and second circumferential regions. The two flanks in the first regions are each configured, in the transition to the outer surface of the rib, with a chamfer of height H.sub.4 such that H.sub.4<H.sub.2, and are spaced by a distance B.sub.2 along their radial extent in the outer extension section from radially inward to radially outward as far as the chamfer.

Tread with longitudinally oriented grooves (31, 41, 42) at least one is wavy (31) opening onto tread surface (10), at least one rib (21) oriented in the longitudinal direction and delimited by (31) with external cavities (311) opening to tread surface and internal cavities (312) hidden within the thickness of the tread, cavities (311) opening onto the surface (10) when new with a contour (310) having farthest-spaced endpoints A and B separated by a distance Lm, the rib (21) of width Ln having transverse sipes (5), made at a mean pitch Pi, where the length Lm of contour (310) of cavity (311) is equal to or greater than an integer multiple N of the pitch Pi times an amount at most equal to 25% of this integer multiple N of the pitch Pi, when new, N+1 transverse sipes (5) of rib (21) open into cavity (311) bordering the rib.

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.