Tread for a pneumatic tyre comprising a sipe having a sipe extension (L) and a sipe depth (P) along a direction of wear (U), wherein said sipe has at least two sections (S1, S2) along said direction of wear (U) having respective differentiated conformations, such that an intersection profile (P1, P2) between the sipe and a surface (T1, T2) parallel to the contact surface of the tread is different for each of said at least two sections (S1, S2), wherein at least one surface section (S1) of said at least two sections (S1, S2) has a depth (PS) that is variable along said sipe extension (L), said two sections (S1, S2) being connected by a transition section (S3) defining a transition line (TL) between the respective sections (S1, S2), said variable depth (PS) of said surface section, presenting a maximum depth (PSMAX) and a minimum depth (PSMIN), and wherein the surface section (SI) has a twisted configuration.

The tread comprises a plurality of blocks, each block being delimited by transverse or oblique grooves and circumferential grooves. Each block is provided with a sipe which has three branches. The branches have common ends. A first branch is oriented in a transverse or oblique direction. A second branch and a third branch each open when new into a transverse groove delimiting the block. The angle formed between the first and second branches is 100 to 125 degrees, and the angle formed between the first and the third branches is 100 to 125 degrees. After wear, each sipe represents between 45% and 70% of the total wearable thickness, such that the lengths of the three branches measured on the new tread surface, L1′, L2′, L3′ respectively, are shorter than the lengths L1, L2, L3 respectively measured on the tread surface when new.

A pneumatic tire includes: a plurality of shoulder blocks that are provided in a side portion, defined by a shoulder main groove extending in a tire circumferential direction and a shoulder lateral groove extending in a tire width direction, and disposed side by side in the tire circumferential direction; a rib that is provided in the side portion, and extends in the tire circumferential direction along the shoulder blocks; and a projection that is provided in the side portion, and extends from the rib toward the shoulder blocks.

A pneumatic tire comprises a plurality of blocks arranged on a tire ground contact edge. The plurality of blocks each comprise at least one main sipe that comprises: a two-dimensional sipe portion extending in a tire circumferential direction, and a three-dimensional sipe portion extending in a tire lateral direction that connects to the two-dimensional sipe portion.

A pneumatic tire includes, in a tread, a plurality of blocks divided by grooves extending in a tire circumferential direction and grooves extending in a tire width direction, and a plurality of sipes and a stud pin hole disposed in the blocks. In such a tire, at least a portion of the sipes provided in a peripheral area of the stud pin hole comprises a raised bottom portion.

A pneumatic tire has a high wet performance with keeping steering stability and wear resistance. Each of the middle land portions (12) is provided with middle sipes (15) and a middle sub-groove (16). Each of the middle sipes (15) has an arc-like shape such that an angle (θ1) with respect to the circumferential direction of the tire gradually increases from its inner end (15i) towards its outer end (15o). A circumferential length (L2) is in a range of from 0.6 to 1.0 times the arrangement pitch (P2) of the middle sipe (15). The middle sub-groove (16) communicates with a shoulder main groove (10), terminates without communicating with a crown main groove (9), and has an arc-like shape having an angle (θ2) that gradually increases from its inner end (16i) to its outer end (16o). A length (L3) of the middle sub-groove (16) is less than the length (L2) of the middle sipe, and the adjacent middle sipe (15) and middle sub-groove (16) overlap one another in the axial direction of the tire.

A tread made of rubber-like material for a tire for winter travel having a plurality of blocks of a height H, each block comprising a contact face designed to come into contact with the ground when the tire travels and at least one lateral face, said lateral face being covered by a layer of covering material over at least 50% of the surface thereof, and a leading zone designed to come into contact first with the ground when the tire travels, and said block has an oblique direction of extension (J) such that the leading zone of said block is a leading corner, and a part which is not covered by the covering material, said covering material having a modulus of elasticity which is greater than the modulus of elasticity of the rubber-like material forming the block, said uncovered part extending from the leading corner over at least ⅓ of the height H of the block.

A pneumatic tire includes: a first and second main grooves extending in a tire circumferential direction; first and second inclined grooves extending obliquely toward the same side with respect to the tire circumferential direction and connected to the first and second main grooves; and a block defined by the first and second main grooves and the first and second inclined grooves. The block includes a sub groove having a first portion and a second portion, the first portion being open to an intermediate portion of the first inclined groove and extending in the tire circumferential direction, the second portion being inclined to a side opposite to the first inclined groove, extending from a terminal end of the first portion in a direction away from the first inclined groove, and being open to the first main groove.

A pneumatic tire includes a tread portion provided with a circumferentially extending zigzag shoulder main groove arranged proximate to a tread edge, and a plurality of shoulder lateral grooves each extending axially outwardly from the shoulder main groove. Each of the shoulder lateral grooves includes a first portion and second portion. The first portion includes a first groove wall and an axially inner end connected to the shoulder main groove. The second portion is arranged axially outward of the first portion and includes a second groove wall. The second portion has a groove width and a groove depth greater than those of the first portion. The first groove wall of the first portion and the second groove wall of the second portion are smoothly continued.

A pneumatic tire 1 is provided in a tread portion 2 with a circumferential land region 6 provided with transverse sipes 15 extending across the entire width of the circumferential land region. Each of the transverse sipes 15 comprises an arc-shaped first portion 18 convexed toward one side in the tire circumferential direction and an arc-shaped second portion 19 convexed toward the other side in the tire circumferential direction and connected with the first portion 18 so as to have a wavy configuration. The transverse sipes 15 include a first transverse sipe 16 of which first portion 18 is deeper than the second portion 19 thereof, and a second transverse sipe 17 of which second portion 19 is deeper than the first portion 18 thereof.