A tire includes first and second laterally spaced sides and a tread interposed between the first and second sides. The tread includes a tread surface having at least one groove therein, the at least one groove including facing, first and second sidewalls separated by a groove bottom surface. A first pocket region of recessed serrations extends over at least a portion of the first sidewall and a second pocket region of recessed serrations extends over at least a portion of the second sidewall. The serrations of the first and second pocket regions are staggered in a circumferential direction relative to one another.

A tire tread (10) having one or more grooves (20.sub.1, 20.sub.2), one or more split bridges (24) arranged in each groove (20.sub.1, 20.sub.2), wherein the one or more split bridges (24) having a narrow gap (26) arranged along the width of the corresponding split bridge (24) and extending fully across the length and height of the corresponding split bridge (24), a top side of the one or more split bridges (24) is arranged closest to an outer side (16) of the tread (10), at least a portion of the top side is spaced apart from the outer side (16) of the tread (10) in a direction of a depth of the groove (20.sub.1, 20.sub.2) by a variable distance, and a bottom side of the one or more split bridges (24) is spaced apart from a bottom of the groove (20.sub.1, 20.sub.2) to form a void between the corresponding split bridge (24) and the bottom of the groove (20.sub.1, 20.sub.2).

A tire has a tread surface, the tread surface including a circumferential groove extending in a tire circumferential direction, a lug groove extending in a direction intersecting the circumferential groove, and a plurality of land parts partitioned by the circumferential groove and the lug groove. A width-direction groove extending in a tire widthwise direction is formed on a land part of the plurality of land parts. An in-groove sipe is arranged along one side edge of a groove bottom of the width-direction groove.

Provided is a pneumatic tire including a tread portion having a ground contact surface configured to contact a road surface. The tread portion includes at least one groove that opens to the ground contact surface. The groove includes a projecting region provided with a plurality of fine projections that project from a groove wall surface facing space within the groove so as to be distributed in a point manner. A ratio H/L1 of a projection height H of the fine projection from the groove wall surface and a groove depth L1 of the groove from the ground contact surface is from 0.01 to 0.09. A ratio W/L2 of a width W of the fine projection orthogonal to a projection direction of the fine projection and a groove width L2 of the groove is from 0.002 to 0.02.

A tyre includes a tread portion including a crown land portion defined between two main grooves extending continuously in a tyre circumferential direction. The crown land portion is provided with crown lateral grooves traversing the crown land portion. Each of the crown lateral grooves, in a cross-sectional view perpendicular to its longitudinal direction, includes a sipe portion having a width equal to or less than 1.5 mm, and a main portion connected to the sipe portion and opening at a ground contact surface of the crown land portion. The main portion has a width enlarging from the sipe portion. The main portion has a depth smaller than depths of the main grooves. The sipe portion has a first wall extending in a tyre radial direction so as to be continuous with a first wall of the main portion to form a single groove wall together.

A pneumatic tire includes a tread portion having a tread surface for making contacting with a road surface and a groove recessed inward from the tread surface and extending along a circumferential direction, and a plurality of noise reflectors protruding from the groove and disposed spaced apart from each other along the circumferential direction. The groove includes a groove bottom surface spaced apart by a predetermined distance from the tread surface in a radial direction of the pneumatic tire and a plurality of groove side surfaces connected to the groove bottom surface and each including a connection curved surface having a predetermined curvature. Each of the noise reflectors includes a support surface supported by the connection curved surface and the groove bottom surface and a protrusion surface located on a side opposite to the support surface and disposed to be spaced apart from the connection curved surface.

A tread pattern of a pneumatic tire includes three or more circumferential main grooves extending in a tire circumferential direction, a plurality of lug grooves provided in a land portion defined by two circumferential main grooves, and a sipe provided between adjacent lug grooves. The sipe is a composite sipe having a two-dimensional portion and a three-dimensional portion. Among open ends on both sides of the lug groove, an open end on an identical side to an end portion of the sipe at which the two-dimensional portion is provided is provided with a raised bottom portion.

Tread for heavy-duty vehicle tire, having tread surface in the new state, having a first volume of cavities opening onto the tread surface, a second volume of cavities formed entirely under the tread surface and having at least one channel of height Hc delimited by two main walls spaced apart from one another by a width Lc and connected together by a lower part and by an upper part, this channel intended to form, after partial wear corresponding to a thickness Lu, an additional groove, such that each channel has a plurality of extensions forming cavities extending between this channel and the tread surface over a height He at least equal to 20% and at most equal to 75% of the thickness Lu, each extension opening at least into the upper part of the channel through an opening having a cross-sectional area Sa at least equal to 0.8*(Hc*Lc).

A tread pattern of a pneumatic tire includes two or more circumferential main grooves in a half region demarcated by the equatorial plane, and land portions defined by the circumferential main grooves. A center land portion closest among the land portions to the equatorial plane includes a center sipe extending in the width direction, the center sipe is a composite sipe including a two-dimensional portion and three-dimensional portions provided on both sides of the two-dimensional portion in the width direction, a middle land portion that is adjacent to an outer side of the center land portion in the width direction includes a middle sipe extending in the width direction, and the middle sipe is a composite sipe comprising a two-dimensional portion provided on an inner side in the width direction and a three-dimensional portion provided on an outer side of the two-dimensional portion in the width direction.

A pneumatic tire includes a land portion defined by two circumferential main grooves extending in the circumferential direction, lug grooves in the land portion, and a sipe between adjacent lug grooves. An outer side edge of the land portion in the width direction has a zigzag shape, and an inner side edge of the land portion in the width direction has a straight shape. The sipe extends continuously from the outer side edge to the inner side edge, and the sipe has a Z-shape with two bent portions, and a ratio of a distance in the width direction between a bent portion closer to a center line passing through a midpoint position of the land portion in the width direction and the center line to a width of the land portion in the width direction being 0 to 0.40.