Abstract: A shaft having an entire length of L includes fiber reinforced resin layers including one or more straight layers, a bias layer, and hoop layers. The one or more straight layers include one or more full length straight layers each having a length of 0.7L or greater. The hoop layers include full length hoop layers each having a length of 0.7L or greater. The full length hoop layers consist only of one inner full length hoop layer and one outer full length hoop layer. At least one of the one or more full length straight layers is disposed inside the outer full length hoop layer. When thicknesses of the inner and outer full length hoop layers are denoted by T1 and T2, respectively, 1<T2/T1<2. The outer full length hoop layer has a resin content smaller than that of the inner full length hoop layer.

Abstract: A golf ball can include a core, a mid layer, and a cover. A hardness Hm of the mid layer can be larger than a hardness Hc of the cover. In a graph on which distances of and Shore C hardnesses at a central point of the core, six points between the central point and a surface of the core, and a point on the surface are plotted, a slope A1 of a straight line connecting the central point and a first point can be not less than 1.00. A maximum value Amax of absolute values of the following slopes A2 to A7 can be not greater than 0.90. A2: a slope of a straight line connecting the first point and a second point. A3: a slope of a straight line connecting the second point and a third point. A4: a slope of a straight line connecting the third point and a fourth point. A5: a slope of a straight line connecting the fourth point and a fifth point. A6: a slope of a straight line connecting the fifth point and a sixth point. A7: a slope of a straight line connecting the sixth point and the point on the surface.

Abstract: A tire management system (100) includes: a first communication apparatus (2) that acquires state information regarding a state of a tire (11) that is transmitted from an air pressure detection device (12) provided in a vehicle (1) when the vehicle (1) is located in a communication range of a predetermined wireless communication standard; and a management server (4) including a storage processing portion (70) that stores, into a storage portion (43), the state information acquired by the first communication apparatus (2).

Abstract: A heavy duty pneumatic tire includes a crown circumferential groove, a shoulder circumferential groove, crown lateral grooves, and crown blocks. The crown circumferential groove includes crown first-side vertexes and crown second-side vertexes and thus zigzags. The shoulder circumferential groove includes shoulder inner-side vertexes and shoulder outer-side vertexes. The crown lateral grooves are disposed at two pitch intervals of a zigzag of the crown circumferential groove and connect between the crown first-side vertexes and the shoulder inner-side vertexes. The crown blocks have crown sub-grooves having a groove width less than a groove width of the crown lateral groove. The crown sub-groove includes at least two transverse grooves extending across the crown block.

Abstract: The aqueous adhesive for a tennis ball includes rubber latex. The rubber latex is a mixture of liquid rubber latex and solid rubber latex. A ratio of liquid rubber to an entire rubber component contained in the rubber latex is greater than 20% by weight and less than 90% by weight in terms of solid content. The tennis ball includes a seam formed of the aqueous adhesive for a tennis ball.

Abstract: A pneumatic tire includes a tread portion, sidewall portions, a pair of bead portions embedded with bead cores, and a carcass. The carcass includes a turned up ply including a main body portion extending between the bead cores, and a pair of turned up portions turned up around the bead cores from axially inside to outside. Each bead portion is provided with an inner apex rubber extending radially outward from the bead core between the main body portion and the turned up portion and an outer apex rubber arranged axially outside the turned up portion. The inner apex rubber has a radial height of from 18 to 30 mm. A buttress thickness D, a maximum width thickness E, and a bead thickness F satisfy expressions E?4.5 mm, F?9.0 mm, E/D=0.6 to 0.9, and F/E=1.7 to 2.2.

Abstract: A racket 2 includes a frame 4, a grip 6, a grommet 10, and a string 12. The frame 4 includes a head 14, a first throat 16a, a second throat 16b, and a shaft 18. A maximum value of a thickness of the frame 4 is less than 26.0 mm. The racket 2 has an in-plane stiffness index Gi of greater than or equal to 5000 and less than or equal to 8000. The in-plane stiffness index Gi is a product of a top pressure stiffness value Git (kgf/cm) and a side pressure stiffness value Gis (kgf/cm). The racket 2 has an out-of-plane stiffness index Go of greater than or equal to 45000 and less than or equal to 60000. The out-of-plane stiffness index Go is a product of a throat stiffness value Gos (kgf/cm) and a ball-hitting face stiffness value Goh (kgf/cm).

Abstract: A tire that allows enhancement of running performance on a deep snow road surface is provided. A tire 1 includes a first shoulder block 3. The first shoulder block 3 includes a first tread surface 5 extending inward from a first tread end T1 in the tire axial direction, a first side surface 6 extending inward from the first tread end T1 in the tire radial direction, and a second tread surface 7 extending outward from the first side surface 6 in the tire axial direction. The second tread surface 7 extends at an angle ? of 10° or less relative to a contact line 5n extending in contact with the first tread surface 5 through the first tread end T1. At least one groove 8 is disposed in the second tread surface 7.

Abstract: A motorcycle tire can include a tread portion, sidewall portions, bead portions, and a carcass. The tread portion can include a tread reinforcing layer and a tread rubber. The tread reinforcing layer can include a belt layer and a band layer. A development width of the band layer can be smaller than that of the belt layer. The tread rubber can include a crown rubber and shoulder rubbers. A hardness at 100° C. of each shoulder rubber can be higher than a hardness at 100° C. of the crown rubber, a complex elastic modulus at 100° C. of each shoulder rubber can be higher than a complex elastic modulus at 100° C. of the crown rubber, and a 300% modulus at 100° C. of each shoulder rubber can be higher than a 300% modulus at 100° C. of the crown rubber.

Abstract: An object of the present disclosure is to provide a golf ball that can fly in a lowered maximum height on driver shots by a golfer with a fast head speed. The present disclosure provides a golf ball comprising a spherical core, an intermediate layer, and an outermost cover having a plurality of dimples formed thereon, wherein the spherical core is formed from a rubber composition containing a base rubber, a co-crosslinking agent, and a crosslinking initiator, the base rubber contains a natural rubber, the co-crosslinking agent contains methacrylic acid and/or a metal salt thereof, a total lower volume of the plurality of dimples is 365 mm3 or more, and an occupation ratio of a total area of the plurality of dimples in a surface area of a phantom sphere that is assumed to have no dimples on the outermost cover is 75% or more.

Abstract: An object of the present disclosure is to provide a golf ball that has a small difference between a flight distance on driver shots by a golfer with a fast head speed and a flight distance on driver shots by a golfer with a slow head speed, and can reduce flight distance handicap. The present disclosure provides a golf ball comprising a spherical core, an intermediate layer, and an outermost cover having a plurality of dimples formed thereon, wherein the spherical core is formed from a rubber composition containing a base rubber, a co-crosslinking agent, and a crosslinking initiator, the base rubber contains a natural rubber, a total lower volume of the plurality of dimples is 365 mm3 or more, and an occupation ratio of a total area of the plurality of dimples in a surface area of a phantom sphere that is assumed to have no dimples on the outermost cover is 75% or more.

Abstract: A golf club head comprises a face portion having a face's front surface for hitting a ball, a face's rear surface and a face's center. The face's back surface is provided with a central thin part, a sole side thin part extending in the toe-heel direction on the sole side than the central thin part, and a sole side rib extending in the toe-heel direction located between the central thin part and the sole side thin part. The width W1 of the sole side thin part is larger than the width W2 of the sole side rib, each measured in a vertical cross-sectional view of the head taken perpendicularly to both the face's front surface and the horizontal surface, passing through the face's center.

Abstract: It is an object of the present invention to provide a novel organic sulfur material which is capable of improving a charge/discharge capacity and cycle characteristics, an electrode comprising the organic sulfur material, that is, a positive electrode or a negative electrode, and a lithium-ion secondary battery comprising the electrode. Provided is an organic sulfur material comprising a sulfur-modified acrylic resin, wherein an acrylic resin has peaks around 756 cm?1, around 1066 cm?1, around 1150 cm?1, around 1245 cm?1, around 1270 cm?1, around 1453 cm?1, and around 1732 cm?1 in an FT-IR spectrum.

Abstract: A motorcycle tire comprises a tread portion having a first tread edge, a second tread edge and a ground contacting surface. The ground contacting surface comprises a first ground contacting surface from the tire equator to the first tread edge. When the first ground contacting surface is equally axially divided into a first, a second, a third, a fourth and a fifth zone in order from the tire equator to the first tread edge, a land ratio of the second zone is larger than a land ratio of the first zone and larger than a land ratio of the third zone.

Abstract: A pneumatic tire can include a plurality of Helmholtz sound absorbers on a tire inner cavity surface. The plurality of Helmholtz sound absorbers can have a first resonance frequency as a maximum resonance frequency and a second resonance frequency as a minimum resonance frequency. A difference between the first resonance frequency and the second resonance frequency can be 10 to 90 Hz.

Abstract: The present invention is directed to a pneumatic tire including: a tread portion; a pair of sidewall portions extending to an inner side in a tire radial direction from both respective ends in a tire axial direction of the tread portion; a pair of bead portions located on the inner side in the tire radial direction relative to the pair of respective sidewall portions; and a plurality of Helmholtz sound absorbers disposed on a tire inner cavity surface. The plurality of Helmholtz sound absorbers include first and second sound absorbers respectively having a first resonance frequency and a second resonance frequency different from the first resonance frequency. Each of the first and second sound absorbers is disposed on an inner side in the tire axial direction relative to at least one of either of the pair of sidewall portions and either of the pair of bead portions.

Abstract: A pneumatic tire having a tread, wherein the ground contact surface of the tread is composed of at least two types of rubber compositions different in the thermal conductivity, and the following formulas (1) and (2) are satisfied: 1700?(Dt2×?/4)/Wt?2827.4??(1) [(V+1.5×107)/Wt]?2.88×105??(2) where Wt (mm) is the cross-sectional width and Dt (mm) is the outer diameter of the tire when installed on a standardized rim and inflated to an internal pressure of 250 kPa, and V (mm3) is the virtual volume of the space occupied by the tire.