A pneumatic tire includes a tread portion provided with a pair of shoulder main grooves and at least one crown main groove between the shoulder main grooves to define a pair of middle portions between the adjacent shoulder main groove and crown main groove. The middle portions are provided with inner middle lug grooves and outer middle lug grooves. Each outer middle lug groove extends from the shoulder main groove to its axially inner end while decreasing its groove width. The outer middle lug groove are arranged with alternately arranged first pitches and second pitches, wherein the second pitches are larger than the first pitches. Each inner middle lug groove extends from the crown main groove to its axially outer end while decreasing its groove width. The inner middle lug grooves are arranged with substantially the same pitches.

Provided is a pneumatic tire. A profile line (PL1) of a center land portion (X) protrudes further outward in the tire radial direction than a standard profile line (PL0). Profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined outward of center main grooves (14a, 14b) in the tire width direction protrude outward in the tire radial direction further than the standard profile line (PL0). The shoulder land portions (Z1, Z2) are defined further outward than the sub-center land portions (Y1, Y2). Further, the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each include an outermost point (A2, A4) of the corresponding center main groove (14a, 14b) in the tire width direction and both end points (A5, A6, A7, A8) of the corresponding shoulder main groove (14c, 14d) in the tire width direction.

A pneumatic tire comprising a carcass 11, at least one inclined belt layer 13 having a cord extending inclined at an angle of 30° or more relative to the tire circumferential direction, and a tread 15 arranged outward in the tire radial direction of the inclined belt layer 13, wherein a circumferential cord layer 14 arranged inward in the tire radial direction of the tread 15 has a high-rigidity region and a low-rigidity region and the high-rigidity region has a lower negative ratio in a ground contact width of the tread 15 than the low-rigidity region.

A tyre 1 for a motorcycle comprises a tread portion 2 and a pair of sidewall portions 3 connected with both ends of the tread portion 2 and extending inwardly in a tyre radial direction. A connecting portion 9 of the tread portion 2 and at least one of the pair of the sidewall portions 3 is provided with a plurality of protruding portions 10 each protruding outwardly in a tyre axial direction. The plurality of the protruding portions 10 is arranged in a tyre circumferential direction with a space 11 between each other.

Tread having a maximum thickness PMU of material to be worn away during running, having: at least two grooves of circumferential overall orientation delimiting at least one intermediate row and two edge rows, a plurality of cuts of transverse overall orientation on each intermediate and edge row, representing, in the new state, a void of total volume Vco open onto the tread surface, at most equal to 13% of the total volume of the tread, channels or cavities extending under the tread surface in the new state, adapted to form new grooves after the tread has partially worn away, and having, in the initial state, a total volume Vcc at least equal to 30% of the total void volume Vco in the new state, intermediate rows of suffix (i) and edge rows of suffix (e) each provided with a plurality of cuts of transverse or oblique orientation distributed over each row evenly or near-evenly with a mean pitch of Pi and Pe respectively, having mean depths, Di and De respectively, which are at least equal to 20% of the thickness PMU and at most equal to thickness PMU, wherein: on the edge rows, Pe is such that 1.30<Pe/De<3.00, and on the intermediate rows, Pi satisfies 1.00<Pi/Di<1.70, and Pe is greater than Pi.

An agricultural tire has an equatorial plane separating first and second sides. First and second inner sixths of the treads extend between the equatorial plane and circumferential reference planes disposed axially one-sixth of a tread width on either side of the equatorial plane. First and second middle sixths of the tread extend between inner circumferential planes and middle circumferential reference planes one-sixth of the tread width from the inner circumferential reference planes. Outer sixths extend between the middle circumferential reference planes and outer circumferential reference planes disposed one-sixth of the tread width from the middle planes. Net tread volume ratio is approximately 40 percent, where between 36 and 39 percent of lug volume is in the inner sixths, between 32 to 35 percent in the middle sixths, and 27 to 30 percent in the outer sixths of the tread.

A pneumatic tire is provided in the tread portion with a central land portion between two crown main grooves. The central land portion is provided with notches each having a depth of 55% to 65% of the depth of the crown main groove and having a closed end and an open end opening to the crown main groove. The maximum axial length of the central notch is 10% to 15% of the maximum axial length of the central land portion, and the circumferential length of the opening is 10% to 15% of one circumferential pitch of the shoulder block row 7R. The circumferential length of the opening is 15% to 25% of one circumferential pitch of the central notches.

The present disclosure aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present disclosure relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardness when dry−Hardness when water-wet≥1 (1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition; and tan δ at 70° C. when dry≥0.18 (2) wherein the tan δ at 70° C. represents the loss tangent measured at 70° C., an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.

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 radial tire for an aircraft, the radial tire having a rim diameter of 20 inches or less includes a pair of bead portions; a pair of sidewall portions extending outward from the bead portions in a substantially radial direction; a tread portion that couples together respective radial outer ends of the sidewall portions; a toroidal carcass layer reinforcing a portion between bead cores embedded in the bead portions; a belt layer and a tread that are sequentially laminated on an outer side of the carcass layer in the radial direction, wherein a value M obtained by dividing a tire external diameter D by a distance L between bead heels of the bead portions is in a range of from 4.1 to 5.4.