Tire tread (1) is divided into central part (20) and edge parts (30), central part (20) having width Lc between 40% and 90% of total width W of the tread. Edge parts (30) do not have any transverse cuts. Central part (20) has a tread pattern with circumferentially oriented sipe (21) and transversely oriented sipes (22, 22, 22) distributed around the periphery of the tread, such sipes having a depth at least equal to 60% of thickness E of material to be worn away and being interconnected to form a network. Such sipes are continued by hidden channels (210, 220). Central part (20) is delimited axially by transverse sipes (22, 22), each of which ends in end channel (221, 221) that opens onto tread surface (10) and extends into the thickness of the tread, and each end channel (221, 221) is connected to the network formed by the hidden channels.

The present disclosure concerns tire treads including one or more particular void features. These void features include a submerged void portion (22) and a connecting portion (24). The submerged void portion (22) is submerged within a thickness of the tread. The connecting portion (24) forms a passage extending from an orifice (28) arranged along the outer side of the tread and is in fluid communication with the submerged void portion (22). The connecting portion (24) includes an outer tapering portion (26) that tapers inwardly from the orifice (28) to a narrowed portion (30) of the connecting portion (24) or passage.

A sipe formed in a block of a pneumatic tire includes a first inclined portion inclined against a tire radial direction, a second inclined portion formed at an outer side in the tire radial direction with respect to the first inclined portion and inclined in a direction opposite to the first inclined portion with respect to the tire radial direction, a bent portion communicated with the first inclined portion and the second inclined portion and bent to be protruded toward a direction in which a gap between the first inclined portion and the second inclined portion becomes narrow, and a widened portion formed at an inner side in the tire radial direction with respect to the first inclined portion and widened in a groove width more than the first inclined portion. The widened portion is communicated with the first inclined portion and formed at a side of the bent portion with respect to an extension line of the first inclined portion.

A pneumatic tire comprises a tread portion 2 having an outside tread edge Teo and an inside tread edge Tei to be positioned outside and inside, respectively, with respect to a vehicle. The tread portion 2 is axially divided into land regions 4 by four main grooves 3 including an outside shoulder main groove 5, an inside shoulder main groove 6 and two crown main grooves 7. The outside shoulder main groove 5 has a width smaller than the inside shoulder main groove 6 and the crown main grooves 7. The land portions 4 include an inside shoulder land region 10 provided with inside shoulder lateral grooves 17. Each of the land regions 4 is provided with sipes 20 each extending across the entire width of the land region and having a width less than 3 mm.

The invention relates to a tyre (1), the tyre (1) comprising: a tread (2) having a tread surface (3) for contacting the ground and at least one groove-like recess (4) therein forming a free space (5), the recess (4) having a longitudinal extension A along the surface (3) and a depth B measured in a radial direction with respect to a radial axis (X) of the tyre (1) from the tread surface (3) to a radially innermost position (19), wherein the free space (5) can be divided into a sipe portion (6) opening to the tread surface (3) and a groove portion (7) located radially inwards the sipe portion (6), wherein in a cross sectional view transverse to the longitudinal extension A of the recess (4) the groove portion (7) has a groove contour (9), with a longitudinal axis (X), wherein a corresponding width of the groove contour (9) has a local maximum Wg at a height H referred to a spatial extent E of the groove contour (9) in the direction of this longitudinal axis (X) and wherein the groove portion (7) has at least one transition section along the longitudinal extension A of the recess (4), between the ends (17, 18), wherein the height H of the groove portion (7) changes by an amount H. The invention further relates to a corresponding wheel for an automobile comprising such kind of tyre (1), a blade (11) for forming a part of a corresponding tyre moulding form and a corresponding moulding form.

A tire includes sipes, on a surface of a tread of the tire, extending towards the direction of tire rotation from the tread edge side to the tire equator side of the surface of the tread. The sipes are disposed at intervals in the circumferential direction of the tread. In each of the sipes disposed at the tread edge side, a plane that follows the shape of the opening of the sipe and extends in the tire radial direction from the opening is defined as a reference plane, and each of the sipes disposed at the tread edge side is formed to include an extending portion that extends along the reference plane in the tire radial direction from the opening and a protruding portion that protrudes from the reference plane towards the direction of tire rotation and returns to the reference plane via a bend.

A pneumatic tire is provided in which main sipes 20 are formed on land sections of a tread and at least one of ends in an extending direction of each main sipe is a blocked end 21 that is blocked in the land section, auxiliary sipes 23 separated from the main sipe are formed on both sides of the blocked end, the blocked end overlaps with the auxiliary sipes on both sides thereof in a direction orthogonal to the extending direction of the main sipe, a distance between a center in an extending direction of the auxiliary sipe and the blocked end is 10% or more to 20% or less of a depth of the main sipe, the extending direction of the auxiliary sipes is inclined with respect to the extending direction of the main sipe, and the auxiliary sipes are gradually shortened as coming toward a depth direction.

A shoulder block is formed with a first shoulder sipe and a second shoulder sipe that extend from a grounding end toward a shoulder main groove and have an end portion that terminates in the shoulder block. The end portion of the first shoulder sipe and the end portion of the second shoulder sipe are different in position of a tire width direction.

A pneumatic tire includes a sipe line that is a line constituted of continuation of the sipe. The sipe line extends from one grounding end toward the other grounding end of the tread portion and has an amplitude in both a tire circumferential direction and a tire width direction.

A center sipe formed in a center block does not have a bend portion. The center sipe crosses the center block in the tire width direction. Both end portions of the center sipe are positioned in a range of 55% or more and 85% or less of a dimension in the tire circumferential direction of the center block from both end portions in the tire circumferential direction of the center block. The center sipe has an amplitude of an amount of 60% or more and 85% or less of a dimension in the tire width direction of the center block.