A pneumatic tire comprises a plurality of main grooves extending in a tire circumferential direction, and a plurality of land portions that are partitioned by at least one contact patch end and the plurality of main grooves, the plurality of land portions comprise a center land portion that contains a center in a tire width direction, and a pair of side land portions that are adjacent in the tire width direction to the center land portion, and respective maximum values of amounts by which the pair of side land portions protrude from a tread profile are each greater than a maximum value of an amount by which the center land portion protrudes from the tread profile.

A pneumatic tire comprises a plurality of main grooves extending in a tire circumferential direction, and a plurality of land portions that are partitioned by at least one contact patch end and the plurality of main grooves, the plurality of land portions comprise a center land portion that contains a center in a tire width direction, and a pair of side land portions that are adjacent in the tire width direction to the center land portion, and a maximum value of a recessed amount by which the center land portion is recessed relative to a tread profile is greater than respective maximum value of recessed amounts by which each of the pair of side land portions are recessed relative to the tread profile.

A tire is provided with a tread pattern comprising a series of a number N of tread design units arranged repeatedly and circumferentially of the tire in a sequence and having a number m of different circumferential lengths. A first pulse train is defined by viewing the tread design units as pulses arranged in the same sequence as the tread design units at intervals which are defined by the circumferential lengths of the corresponding tread design units expressed in term of a ratio to one of the number m of different circumferential lengths. A maximum value Pmax of amplitudes P(k) (k=order from 1 to 2N) of frequencies obtained by Fourier transforming the first pulse train is limited to specific values. The amplitudes P(k) and P(k+1) of every two of the adjacent orders (k) and (k+1) do not satisfy a condition that both of the amplitudes P(k) and P(k+1) have values of 2/3 or more times the maximum value Pmax.

A tire has a tread pattern comprising a series of a number N of tread design units arranged repeatedly and circumferentially of the tire in a sequence. The tread design units have at least two different circumferential lengths. Viewing the tread design units as pulses, a pulse train is defined. Magnitudes of the pulses are proportional to the circumferential lengths of the tread design units. The average of the magnitudes corresponding to the different circumferential lengths is limited to 1.00. Maximum value Fmax of amplitude F(k) of k-th order (k=1 to 2N) of frequencies obtained by Fourier transforming the pulse train is limited to be 4.520.0125 N. The amplitudes F(k) and F(k+1) of every two of the adjacent orders (k) and (k+1) are limited so as not to satisfy a condition that both of the amplitudes F(k) and F(k+1) are 2/3 or more times the Fmax.

A processing device divides an initial tread pattern into multiple mutually adjacent partial patterns, each having a width smaller than that of the initial tread pattern, by at least one straight line along a circumferential direction of a tire. The processing device calculates variation amounts of characteristic values of the partial patterns with respect to the circumferential direction, based on a contact region, each of the characteristic values indicating a shape of a corresponding partial pattern. The processing device modifies the shapes of the partial patterns so as to reduce the variation amounts of the characteristic values of the partial patterns. The processing device relatively moves the partial patterns along the circumferential direction so as to reduce a total variation amount of characteristic values of at least two mutually adjacent partial patterns. The processing device combines the partial patterns with each other to generate a tread pattern of the tire.

A tyre having a tread is described. The tyre has a central portion located across an equatorial plane, a first shoulder portion located towards an outer side of the tyre and a second shoulder portion located towards an inner side of the tyre. The central portion is separated from the first shoulder portion by two first circumferential grooves. The first shoulder portion and the second shoulder portion have a plurality of first transverse grooves having a first end located substantially at the respective edge of the tread, having a width greater than or equal to about 4 mm and an axial extension equal to at least 50% of the width of the shoulder portion in which they are located.

In a pneumatic tire, an intermediate land portion is provided with a plurality of lug grooves having acute bent portions and a plurality of sipes extending in a direction that intersects with the lug grooves. The lug grooves are disposed so as not to overlap one another in the tire circumferential direction, and each have one end that opens to an outer main groove and an other end that terminates in the intermediate land portion. When pitches, which serve as reference positions, are defined based on end points at which the lug grooves open to the outer main groove, the sipes each are disposed to be located inside one of the pitches, and the groove area ratio in the pitches in the intermediate land portion is in the range from 15% to 25%.

Tread (1) of a tire for an off-road vehicle, with total width (W) and total thickness of wearable material at least equal to 60 mm. The tread is delimited axially by shoulder regions (5) provided with grooves (7). This tread (1) comprises, in central region (6), narrow groove (61) and, between each shoulder region (5) and the central region (6), an intermediate region (4) in which there are formed a plurality of oblique or transverse narrow grooves (411, 412). Narrow groove (61) of the central part is made up of first narrow-groove parts (611) of depth (P1) and of second narrow-groove parts (612) of depth (P2). Depth (P1) is greater than depth (P2). Narrow grooves (411, 412) of one same intermediate region comprise, in the circumferential direction, an alternation of narrow grooves (411) of first depth (P11) and of narrow grooves (412) of second depth (P22).

A tire includes a tire carcass and a tread extending circumferentially about the tire carcass. The tread includes a plurality of tread elements disposed in a tread pattern. The plurality of tread elements have one of two different pitch lengths and are disposed in a noise-reducing pitch sequence.

A pneumatic radial tire 1 for a passenger car comprises a carcass 6 having a radial structure, a belt layer 7, and a tread portion 2. The tread portion 2 has an outer tread edge (To) and an inner tread edge (Ti). A tread pattern is formed in an asymmetric shape with respect to a tire equator (C). The tread portion 2 is divided into a plurality of circumferential land regions by a plurality of main grooves 10. The circumferential land regions include an outer shoulder land region 16, an inner shoulder land region 17, and a middle land region 18 arranged therebetween. The outer shoulder land region 16 is larger than the inner shoulder land region 17 with respect to rigidity in a tire circumferential direction and the rigidity in a tire axial direction.