A tire tread pattern includes a center land portion and an intermediate land portion on an outer side in a width direction thereof. A center land portion region includes no grooves, includes a first sipe having a wide width open to circumferential main grooves on both sides and includes a second sipe having a narrow width between adjacent first sipes and open to the circumferential main grooves on both sides. An intermediate land portion region includes an intermediate lug groove opening to a circumferential main groove in contact with the intermediate land portion. A circumferential direction distance between opening ends of the adjacent first sipes is equal to a distance between opening ends of adjacent intermediate lug grooves in which the region between at least some opening ends in the circumferential direction overlaps the region along the circumferential direction between the opening ends of the adjacent first sipes.

A pneumatic tire according to the embodiment includes a land portion 20 provided on a tread portion, a plurality of sipes 30 provided on the land portion 20, and at least one concave portion 34 disposed between two adjacent sipes 30. Each of the sipes 30 has, at parts in a sipe longitudinal direction, bottom protrusions 42, 44, 46 protruding from a bottom surface of the sipe 30 toward a tread surface. The concave portion 34 is provided close to the bottom protrusions 42, 44, 46.

The present invention includes tire treads (10) and a method for forming tire treads (10) having a sipe (18) with a length extending between opposing terminal ends of the sipe and having a height and a thickness which is variable across the length and height of the sipe. The thickness of the sipe (18) includes a sipe portion arranged between the opposing terminal ends defining the sipe length and having a thick portion extending at least partially around a perimeter of a thin portion. The thin portion is substantially 0.2 millimeters or less thick and forms at least 40% of the surface area along each of the opposing sides of the sipe, the opposing sides being arranged on opposing sides of the sipe thickness.

A pneumatic tire whose position when mounted on a vehicle is specified so that the tread portion 2 has an outside tread edge Te1 and an inside tread edge Te2. The tread portion 2 comprises an outside land region 4A provided with first sipes 10 extending across the entire width of the outside land region. The first sipe 10 comprises a v-shaped portion 13 formed by a first oblique segment 11 and a second oblique segment 12. The v-shaped portion 13 has an apex 15 located on the outside-tread-edge side of a widthwise center of the outside land region 4A. The maximum depth d2 in the second oblique segment 12 is smaller than the maximum depth d1 in the first oblique segment 11.

A pneumatic tire comprises a tread portion 2 provided with a circumferential land region 6 provided with a plurality of combined sipes 35 (36, 37). The combined sipes 35 (36, 37) are each composed of a straight portion 34 extending from one edge toward the other edge of the circumferential land region 6, and an arc-shaped portion 33 extending from the straight portion 34 to the other edge of the circumferential land region 6. The combined sipes 35 include a first combined sipe 36 in which the maximum depth of its arc-shaped portion 33 is larger than the maximum depth of its straight portion 34, and a second combined sipe 37 in which the maximum depth of its straight portion 34 is larger than the maximum depth of its arc-shaped portion 33.

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.

A bias-ply motorcycle tire comprises a tread portion provided with main grooves and sipes. The main grooves extend from a tread crown region into tread shoulder regions. The sipes are provided only within the tread shoulder regions.

A tire comprises a tread portion whose position when mounted on a vehicle is specified. The tread portion includes an inner crown land region defined between a crown main groove and an inner shoulder main groove. The inner crown land region includes crown lateral grooves, first inner crown sipes, second inner crown sipes each extending from the inner shoulder main groove toward the crown main groove and having an inner end terminating within the inner crown land region, and third inner crown sipes each extending from the crown main groove toward the inner shoulder main groove and having an outer end terminating within the inner crown land region. The crown lateral grooves each have a length in a tire axial direction larger than that of each of the second inner crown sipes.

A main object is to provide a tire that suppresses snow clogging of sipes. The tire includes a tread portion. The tread portion includes a first land portion demarcated by circumferential grooves continuously extending in a tire circumferential direction, and a plurality of first lateral grooves inclined in a first direction relative to a tire axial direction and traversing the first land portion. The first land portion includes a plurality of first blocks demarcated by the first lateral grooves. Each first block has at least one sipe inclined in a second direction opposite to the first direction, relative to the tire axial direction. The sipe includes a portion deeper than a maximum depth of the first lateral groove, and a portion shallower than the maximum depth of the first lateral groove.

A tire includes a tread portion being divided into four land portions by one circumferentially extending crown main groove and two circumferentially extending shoulder main grooves arranged one on each side of the crown main groove. The four land portions include two crown land portions disposed one on each side of the crown main groove. Each of the crown land portions is provided with first crown lateral grooves each extending from the crown main groove and terminating within the crown land portion and second crown lateral grooves each extending from the adjacent shoulder main groove and terminating within the crown land portion. In each of the crown land portion, the first crown lateral grooves and the second crown lateral grooves extend at least to an axial center location of the crown land portions.