A tire has a cap rubber formed of a nonconductive rubber and forms a ground surface, and a conductive portion provided in at least one side end portion of a pair of side end portions in both ends in a tire width direction. The conductive portion is formed of a conductive rubber, and reaches a side surface of the cap rubber from the ground surface through an inner portion of the cap rubber. The conductive portion is the smallest in thickness in the ground surface, is relatively large in thickness in the side surface of the cap rubber, is gradually increased in thickness from the ground surface to the side surface of the cap rubber, and is formed into a trumpet shape which is curved into an inner side in a tire width direction and an inner side in a radial direction, in a tire meridian cross section.

Provided is a pneumatic tire including a pair of bead portions; at least one carcass layer extending between the pair of bead portions; a belt layer disposed outward of the carcass layer in a tire radial direction; a tread rubber disposed outward of the belt layer in the tire radial direction; a pair of sidewall rubbers disposed outward of the carcass layer in a tire lateral direction; and an electrically conductive portion extending between the pair of bead portions and having at least one separation portion, the electrically conductive portion having a linear structure, the linear structure including an electrically conductive linear member formed in a linear shape by molding an electrically conductive material with an electrical resistivity of less than 110{circumflex over ()}8 /cm.

A radial tire (10), with the sidewalls thereof (20), and the tread thereof (30) arranged for minimizing the temperature of the tire while guaranteeing its electrical conductivity. The tread (30) comprises two wings (311, 312) and a central portion (32). These components rest on a base layer (33) radially on the inside of the tread (30). The base layer (33) contains a lateral portion (331, 332) partly in contact with a tread wing (311, 312). This structure of the crown of the tire, in contact with the carcass reinforcement makes it possible to constitute a preferential conductive pathway of the electric charges between the rim and the ground when the tire is mounted on its rim and flattened on the ground.

A radial tire (10) for a heavy vehicle of construction plant type, and more particularly, the sidewalls thereof (20), arranged to minimize the temperature of the tire while guaranteeing its electrical conductivity. The tread (30) comprises two tread wings (31) and a central portion (32). The bead layer (71), the elastomeric coating compound of the carcass layer (50), the second sidewall layer (22) and the tread wing (31) constitute a preferential conductive pathway of the electric charges between the rim and the ground when the tire is mounted on its rim and flattened on the ground.

The present invention is directed to a tire having a tread comprising two shoulder portions and a center portion axially between the two shoulder portions, wherein at least one of the shoulder portions comprises a first rubber composition and the center portion comprises a second rubber composition different from said first rubber composition. The first rubber composition has a shear storage modulus which is at least 10% lower than the shear storage modulus of the second rubber composition, and the second rubber composition has a glass transition temperature which is at least 5% higher than the glass transition temperature of the first rubber composition.

It is possible to maintain high-speed durability while having a function of eliminating static electricity of a vehicle. An airless tire 1 includes a tread portion 2, an inner circumferential portion 3 which comes into contact with a wheel 5 having conductivity, and a spoke portion 4 which connects the tread portion 2 and the inner circumferential portion 3. The tread portion 2 includes a first portion 2A having conductivity, and a second portion 2B in contact with the first portion 2A. The second portion 2B, the spoke portion 4, and the inner circumferential portion 3 are formed from a resin or elastomer. The resin or elastomer contains an antistatic agent. The antistatic agent is a polymer-based antistatic agent or surfactant-based antistatic agent. The antistatic agent is blended in an amount of 0.5 to 20% by mass per 100% by mass of a base component of the resin or elastomer.

In a first aspect, the present invention is directed to a tire comprising a belt portion and a tread portion radially outward of the belt portion, wherein the tread portion comprises a radially outer tread layer for contacting the road when driving and a radially inner tread layer arranged between the radially outer tread layer and the belt portion, wherein the radially outer tread layer comprises a first rubber composition having a first shear storage modulus G1 and the radially inner tread layer comprises a second rubber composition having a second shear storage modulus G2, wherein the second shear storage modulus G2 is between 3 MPa and 9 MPa higher than the first shear storage modulus G1, and wherein the first shear storage modulus G1 ranges from 1 MPa to 3 MPa and the second shear storage modulus G2 ranges from 4 MPa to 12 MPa.

A tire includes a pair of beads and a crown region including a circumferential tread disposed radially above a circumferential belt. The tire further includes a pair sidewalls extending from the pair of beads to the crown region. A body ply wraps around the pair of beads and terminates in a pair of turn up ends in the crown region, below the middle 30% of the circumferential belt. A conductive substance is disposed along a strip of the body ply.

The environmental footprint of a tire for a construction plant vehicle is improved. To do so, the elastomer compounds derived from non-fossil resources represent a mass content greater than or equal to 65% of the total mass of the compounds of the tire, at least 75% of the total mass of the compounds of the tire is made up of elastomer compounds each of which has a viscoelastic loss, measured in terms of tan(), less than or equal to 0.065, and an electrical resistivity greater than or equal to 1E+10 .Math.cm.

A tire (1) comprises a crown zone (4) comprising a crown reinforcement (41) surmounted radially on the outside by a tread (40) formed from at least one material that is not a conductor of electricity, the crown reinforcement (41) comprising a plurality of layers (411, 412, 423) superposed on one another, each layer of the crown reinforcement comprising two ends in the circumferential direction, these two ends being joined together in an abutment region, the tread (40) comprising a weld region circumferentially offset by an angle of 180 degrees with respect to the region at which the radially outermost layer of the crown reinforcement (413) is superposed. The tire comprises at least one conducting strip (7) of a thickness at most equal to 2 mm and of small width, positioned between the tread and the crown reinforcement. The conducting strip (7) is located circumferentially in such a way as to be positioned at equal angular distances between the tread weld region and the region at which the radially outermost reinforcing layer is butted together, these two regions being diametrically opposite.