A pneumatic tire having a tread reinforcing component disposed between a tire inner cavity surface and a tire ground contacting surface, and made of a thermoplastic resin. On an arbitrary reference line which extends across the tread reinforcing component in parallel with the tire equator, a distance L1 in the tire radial direction from the tire inner cavity surface to the thickness center point of the tread reinforcing component is in a range of 50% to 95% of a distance L0 in the tire radial direction from the tire inner cavity surface to the tire ground contacting surface.

Provided is a rubber composition for base tread which can provide excellent steering stability and rolling resistance and improve pass-by noise properties when applied to a tire. The present disclosure discloses a rubber composition for base tread to be used for base tread of a tread portion of a tire, where a ratio of storage modulus at 0° C. (0° C. E′) to storage modulus at 30° C. (30° C. E′) (0° C. E′/30° C. E′) is in a range of 1.3 to 2.0.

A rubber composition is prepared by mixing a specific hydrazide compound at a ratio of 0.5 to 3.0 parts by mass, zinc oxide at a ratio of 1 to 5 parts by mass, and carbon black having N.sub.2SA of 60 to 150 m.sup.2/g at a ratio of 30 to 60 parts by mass per 100 parts by mass of diene rubber containing 80 parts by mass or more of natural rubber. The rubber composition is prepared through (a) mixing the hydrazide compound and the carbon black to obtain a mixture, and (b) mixing the zinc oxide with the mixture obtained in step (a) to obtain a mixture. A maximum ultimate temperature during the mixture in step (a) is from 140 to 170° C. A storage modulus and elongation at break have a specific relationship.

Provided is a tire having excellent rolling resistance and improved pass-by noise performance. The tire is a pneumatic tire comprising a side rubber provided on an outer side of a carcass in a tire width direction, in a sidewall portion, wherein a thickness of the side rubber in the tire width direction at a tire maximum width position is 1 mm or more, and a ratio 0° C. tan δ/30° C. tan δ of 0° C. tan δ to 30° C. tan δ of the side rubber is 2.00 or more, where the 0° C. tan δ is tan δ at 10 Hz and 0° C., and the 30° C. tan δ is tan δ at 10 Hz and 30° C.

Provided is a tire having excellent rolling resistance and improved pass-by noise performance. A tire comprises a tread portion that includes a base rubber and a cap rubber located on an outer side of the base rubber in a tire radial direction, wherein a thickness of the base rubber in the tire radial direction is 1 mm or more, 30° C. tan δ of the base rubber is 0.20 or less, and a ratio 0° C. tan δ/30° C. tan δ of 0° C. tan δ to 30° C. tan δ of the base rubber is 2.90 or more, where the 30° C. tan δ is tan δ at 10 Hz and 30° C., and the 0° C. tan δ is tan δ at 10 Hz and 0° C.

A pneumatic tire having a tordial tire framework member having bead portions, sidewall portions and an under tread portion, and a ground contacting tread component disposed radially outside the under tread portion. The ground contacting tread component is made of a first resin material. The sidewall portions and the under tread portion are made of a second resin material. The bead portions are made of a third resin material. The tensile elastic moduli E1 to E3 of the first to third resin materials M3, respectively, satisfy E1<E2<E3.

The present invention aims to provide tire rubber composition with significantly improved overall performance in terms of wet grip performance and fuel economy, and pneumatic tires including the rubber compositions. The tire rubber compositions of the present invention have a tan δ versus temperature curve whose peak tan δ and half width satisfy the following relationship (1): Peak tan δ/Half width ≥ 0.025 (1).

There is provided a non-pneumatic tire (1), which includes an attachment body (11) that is attached to an axle, a ring-shaped body (13) that surrounds the attachment body (11) from an outside in a tire radial direction, a connection member (15) that displaceably connects the attachment body (11) and the ring-shaped body (13) to each other, and a cylindrical tread member (16) that is externally mounted on the ring-shaped body (13), in which the tread member (16) includes a base rubber portion (41) that is positioned at an inside in the tire radial direction, and a cap rubber portion (42) that is positioned at an outside of the base rubber portion (41) in the tire radial direction, and in which the rigidity of the base rubber portion (41) is lower than the rigidity of the cap rubber portion (42).

A tire 2 includes a tread 4 and a belt 14 including inner and outer layers 38 and 40. Each end of the outer layer 40 is located axially inward of an end of the inner layer 38. A circumferential narrow groove 48 is formed on each shoulder land portion 46s so as to continuously extend in a circumferential direction. A groove width of the circumferential narrow groove 48 is smaller than that of a shoulder circumferential groove 44s. The circumferential narrow groove 48 is located between the shoulder circumferential groove 44s and the end of the outer layer 40 in an axial direction. A ratio of a distance in the axial direction from the shoulder circumferential groove 44s to the circumferential narrow groove 48 to a distance in the axial direction from the shoulder circumferential groove 44s to the end of the outer layer 40 is 15% to 55%.

Heavy load pneumatic radial tire according to the present invention includes: tread rubber 6 having laminated structure of cap rubber 5 and base rubber 4; and four or more belt layers 3a-3e disposed radially inward of tread rubber 6. A radially outer side of a width direction side edge of at least one of radially outermost belt layer 3e and widest-width belt layer 3c is covered by reinforcing rubber layer 7 that terminates on a radially inner side of tread rubber 6 without reaching tire equatorial plane E. Relative relation between reinforcing rubber constituting reinforcing rubber layer 7 and base rubber 4 in terms of modulus of rebound elasticity satisfies the condition: reinforcing rubber<base rubber 4.