A pneumatic tire comprises a tread portion; four main grooves extending in a tire circumferential direction in a tread surface of the tread portion, each having a wave-like shape with periodic oscillation; a center land portion, middle land portions adjacent to the center land portion on either side in a tire lateral direction, and shoulder land portions outwardly adjacent to the middle land portions in the tire lateral direction formed by the main grooves; a plurality of lug grooves that intersect the tire circumferential direction disposed in a row in the tire circumferential direction in the land portions, the plurality of lug grooves each being disposed on a smooth, continuous curved line that crosses the land portions between the outer ends of the tread portion in the tire lateral direction.

A method for producing a tread for a tire having a plurality of contacting element delimited by a plurality of grooves and a connecting member. The method includes depositing at least one connecting member on a surface of an unvulcanized green tread, introducing the unvulcanized green tread with the connecting member into a mold having at least one molding element having a plurality of rib for forming the groove on the tread, at least two rib side faces and a molding surface, at least one rib having at least one notching portion receiving a guiding member including a guiding slit, moving the connecting member to a predetermined position in the guiding slit through the guiding slit by green tread, molding and vulcanizing the green tread with the connecting member in the mold, and taking a molded and vulcanized tread out from the mold.

A tyre mold for curing and molding a tyre includes a plurality of tread segments for molding a tread rubber of the tyre. The plurality of tread segments, upon being connected with one another in a mold circumferential direction, forms a tread molding-surface that is substantially continuous in the mold circumferential direction through parting lines that appear between adjacent tread segments. The parting lines include one or more inclined parting lines inclined with respect to a mold axial direction, and the inclined parting lines extend straightly between ends in the mold axial direction of the tread molding-surface.

A longitudinally tapered wheel spoke having a thin aerodynamic cross-sectional profile proximate to the wheel rim and tapering to a round profile toward the central hub, with the tapered section optimized to minimize drag against a combined headwind and crosswind impinging upon the primary vehicle-drag-inducing uppermost region of the wheel assembly.

This disclosure aims to provide a pneumatic tire having improved noise reduction performance exhibited by a resonator. The pneumatic tire according to this disclosure has at least two circumferential grooves extending continuously on a tread surface, and has a resonator disposed on a land portion partitioned by two circumferential grooves among the circumferential grooves, the resonator having an air chamber opening toward a land portion surface at a position spaced from the circumferential grooves, one a more one-side narrow necks connecting the air chamber to one circumferential groove of the two circumferential grooves, and one or more other-side narrow necks connecting the air chamber to the other circumferential groove, the one-side narrow neck and the other-side narrow neck having cross section areas approximately identical to each other, and an extending length of the one-side narrow neck and an extending length of the other-side narrow neck being different.

Provided is a pneumatic tire being improved in heat dissipation effect in the tread portion while being ensured in rigidity of the land portion. A narrow groove (10) is formed on a tread surface (1), the narrow groove extending in a direction inclined with respect to the tire circumferential direction and having a groove width (W1) and a groove depth (D1), the groove width (W1) being smaller than the groove depth (D1). The narrow groove (10) terminates at least one end thereof within the land portion. An air inflow part (11) is formed on at least one of the groove walls (10c) of the narrow groove (10), the groove walls facing each other in the tire circumferential direction, where the narrow groove (10) has a maximum depth (D1) and the air inflow part (11) has a maximum depth (D2), the D1 and the D2 satisfying 1D1/D215.

A pneumatic tire includes a tread having crown grooves, shoulder grooves, middle lands, and shoulder lands. Each middle land has middle blocks and middle inclined lateral grooves such that the middle inclined lateral grooves are inclining relative to tire axial direction and connecting a crown groove and a shoulder groove, each shoulder land has shoulder blocks and shoulder inclined lateral grooves such that the shoulder inclined lateral grooves are inclining relative to the axial direction and connecting a shoulder groove and a tread edge, and each middle inclined lateral groove is positioned adjacent to a shoulder block such that each middle inclined lateral groove and the shoulder block are sandwiching the shoulder groove and overlapping in tire circumferential direction and have a ratio Lov/Lmg ranging from 0.7 to 1.0, where Lov represents tire circumferential overlapping length Lov, and Lmg represents tire circumferential length Lmg of the middle inclined lateral grooves.

An object of the present invention is to provide a pneumatic tire capable of facilitating heat dissipation of a tread portion thereof to lower temperature at the tread portion. Specifically, the present invention provides a pneumatic tire having in a tread surface at least one circumferential groove extending in the tire circumferential direction and plural lateral grooves, the lateral grooves each opening to the circumferential groove, having a wider groove width than the circumferential groove and extending to be inclined with respect to the tire circumferential direction, comprising: a recessed portion formed in a groove wall, facing the corresponding lateral groove, of the circumferential groove; and at least one projecting portion formed at a groove bottom of the circumferential groove between the recessed portions adjacent to each other in the tire circumferential direction.

Provided is a motorcycle pneumatic tire in which the wet grip performance during turning is improved while the steering stability during turning is ensured. In this motorcycle pneumatic tire, a tread portion is composed of a central rubber and a side rubber having a lower modulus than the central rubber and has a structure in which the central rubber and the side rubber are sequentially laminated in both tire widthwise side portions, with the side rubber extending to a tire width-direction inner side further than a point at of a tread width TW on a tire width-direction outer side from a tire equator. A tire ground-contact surface has a tread pattern that includes plural inclined grooves 21 to 25 and, when the tread width is equally divided in eight, among the thus equally-divided eight regions, a region C constituting a range of to of the tread width on the tire width-direction outer side from the tire equator has the largest number of inclined grooves included per a single pitch of the tread pattern, and the depth of the inclined grooves is greater than the thickness of the side rubber in at least a part of the region C.

A pneumatic tire can improve the heat dissipation effect in the tread portion while guaranteeing land portion rigidity and can also suppress degradation of the heat dissipation effect. The pneumatic tire includes a narrow groove (10) on a tread surface (1), extending at an inclination to the tire circumferential direction, the groove width (W1) being smaller than the groove depth (D1), an air inflow part (11) opening to the tread surface (1) and formed on at least one of the groove walls (10c) of the narrow groove (10) that face each other in the tire circumferential direction, and a wear prevention portion (12) formed by a protrusion or concavity on a groove wall (10c) that faces the other groove wall (10c) on which the air inflow part (11) is formed or on the tread surface (1) connecting to the groove wall (10c) that faces the other groove wall (10c).