Pneumatic tire comprising a tread (1) provided with two edges (2), a center (3) and a plurality of tread bars (10) distributed in a circumferential direction, each tread bar (10) extending in an oblique direction from one of the edges (2) towards the center (3) of said tread (1), the plurality of tread bars (10) comprising at least two adjacent tread bars (11, 12); each of said adjacent tread bars (11, 12) has at least one incision (20, 21, 23) extending along the length of the tread bar, each adjacent tread bar has an overall incision length (LGI) corresponding to the sum of the lengths of the incisions that are part of said tread bar, the widths (LB11, LB12) of said adjacent tread bars (11, 12) are different, and the overall incision length (LGI) in said adjacent tread bars (11, 12) is different.

The invention relates to a tyre with improved performance in terms of transverse grip on snow-covered surfaces without a resulting impairment in performance in terms of grip on wet and dry surfaces. The tread is obtained by repeating the tread pattern elements (MA, MB) at pitches (PA, PB) over a complete circuit of the tyre, with PA<PB. Each first lateral portion (ZB) of said tread pattern elements contains at least one longitudinal sipe (50) of which the path on the tread surface (15) is a mean plane (53) that makes an angle Beta with the circumferential direction, which angle is comprised within the range [0?, 20?]. This same mean plane (53) also makes an angle Alpha with the direction (Npsup) normal to the tread surface (15), which angle is comprised within the range [3?; 55?], and the sum of the projected lengths of the longitudinal sipes (50) in the circumferential direction onto all of the first lateral portions (ZB) is comprised between 0.5 times and 5 times the circumference of the tyre measured in the equatorial plane.

A tyre includes a tread having tread blocks such that grooves are arranged between the tread blocks and studs installed into at least some of the tread blocks. The tread blocks define a land portion of the tread, and an envelope surface consisting of the land portion of the tread and a sea portion. An average land ratio of the tyre defined as a ratio of total land area to total envelope area, is 55% to 78%.

A tyre (200) includes a tread (210) having tread blocks (220) with grooves (230) arranged between the tread blocks (220) and studs (100, 100a, 100b) installed into at least some of the tread blocks (220). A central region (CR) of the tread (210) is arranged between a first shoulder region (SR1) of the tread (210) and a second shoulder region (SR2) of the tread (210). At least some of the tread blocks (220) are provided with sipes (240). The tyre (200) has a first density of sipes (240) in the central region (CR), a second density of sipes (240) in the first shoulder region (SR1), and a third density of sipes (240) in the second shoulder region (SR2). The first density of sipes (240) is at least 15% greater than either or both of the second density of sipes (240) and the third density of sipes (240).

A tyre includes a tread having tread blocks such that grooves are arranged between the tread blocks and studs installed into at least some of the tread blocks. A central region of the tread is arranged between a first shoulder region of the tread and a second shoulder region of the tread. A land ratio of the central region of the tread of the tyre is 1 to 30 percentage points greater than either or both of a land ratio of the first shoulder region of the tread of the tyre and a land ratio of the second shoulder region of the tread of the tyre.

An aircraft tire has: plural ribs, (a wide rib, narrow ribs) that are provided at a tread portion, and that are demarcated by circumferential direction grooves that extend in a tire circumferential direction; and sipes that are formed in a tire transverse direction in the respective ribs, and that have tire circumferential direction positions that differ in ribs that are adjacent to one another in the tire transverse direction.

A method of mounting a tire on a vehicle includes providing a tire having a first side, a second side, and a circumferential tread disposed about the tire. The first side defines a first forward rotation direction and the second side defines a second forward rotation direction. The circumferential tread includes a plurality of tread elements, and at least one of the plurality of tread elements includes a sipe arrangement including a plurality of sipes that are angled in a depth direction of the tire. The plurality of sipes are disposed on a first half of the tread element and no sipes are disposed on a second half of the tread element. The sipe arrangement causes the tire to exhibit a first tire performance when the tire is mounted on the vehicle in the first orientation and rotated in the first forward rotation direction, and further causes the tire to exhibit a second tire performance when the tire is mounted on the vehicle in the second orientation and rotated in the second forward rotation direction. The method includes mounting the tire on the vehicle in the first orientation for driving the vehicle in a first set of conditions, and mounting the tire on the vehicle in the second orientation for driving the vehicle in a second set of conditions.

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 circumferential main grooves extending in a tire circumferential direction and land portions partitioned and formed by the circumferential main grooves. The land portion of a center region and the land portions of left and right shoulder regions each have a plurality of sipes. Not less than 90% of the sipes disposed in the center region are constituted by two-dimensional sipes and not less than 90% of the sipes disposed in the shoulder regions are constituted by three-dimensional sipes. The left and right shoulder land portions each have a plurality of lug grooves arranged in the tire circumferential direction. A pitch number N_ce of the lug grooves in the land portion of the center region and a pitch number N_sh of the lug grooves in the land portions and of the left and right shoulder regions have a relationship such that N_ce>N_sh.

A tread pattern of a pneumatic tire includes a pair of circumferential grooves and a plurality of siped lug grooves extending in a tire width direction between the pair of circumferential grooves and disposed at intervals in the tire circumferential direction. Each of the siped lug grooves includes a lug groove extending from a first circumferential groove of the pair of circumferential grooves and closed, and a sipe extending from a closed end of the lug groove toward a second circumferential groove and connected to the second circumferential groove. The plurality of siped lug grooves include at least one first siped lug groove extending while bending with an extension direction of the lug groove differing from an extension direction of the sipe, and at least one second siped lug groove extending linearly with the extension direction of the lug groove aligning with the extension direction of the sipe.