Abstract: A pneumatic tire in which a cavity resonance sound is reduced while punctures are easily repaired with a puncture sealant. The pneumatic tire has a fibrous region where short fibers are bonded onto an inner surface of the tire. A circumferential fiberless region where short fibers are not bonded onto the inner surface of the tire extends circumferentially between both ends of a tread ground contact area.

Abstract: A pneumatic tire in which a cavity resonance sound is reduced while punctures are easily repaired with a puncture sealant. The pneumatic tire has a fibrous region where short fibers are bonded onto an inner surface of the tire. A circumferential fiberless region where short fibers are not bonded onto the inner surface of the tire extends circumferentially between both ends of a tread ground contact area.

Abstract: A pneumatic tire with short fibers fixed to the inner surface of the tire with improved peel resistance, and a method of producing such a pneumatic tire. The pneumatic tire has a carcass toroidally extending from a tread portion along a pair of sidewall portions to a pair of bead portions, and bead fillers provided radially outwardly of bead cores embedded in the bead portions, including flocking areas in which many short fibers are fixed to at least part of an inner surface of the pneumatic tire with an adhesive. The flocking areas are positioned such that their tire radial direction inner ends are positioned inwardly in the tire radial direction as compared to the tire radial direction outer ends of the bead fillers and are spaced a given distance outward in the tire radial direction apart from bead toes.

Abstract: [Subject] To provide a pneumatic tire whose snow performance is improved without affecting its dry performance. [Measures for Addressing the Subject] Step portions 22F and 22R that are continuous so as to protrude respectively from step-in sides and kick-out sides of each of blocks 20 configuring a tread portion 16 are disposed in a pneumatic tire, and the step portions 22 are disposed in a staggered manner in the tread portion 16. Thus, even when the step portions 22 are disposed, the rigidity of the blocks 20 does not decline that much and dry performance is not affected that much. Further, snow performance can be improved by the edge pressure of the step portions 22.

Abstract: A pneumatic tire comprising a tread portion which comprises a surface rubber layer which is disposed in an outer portion of the tread portion in the radial direction of said tire and has a specific resistance of 108 &OHgr;·cm or more after curing by vulcanization and conductive rubber members which comprise a rubber composition having a specific resistance of 106 &OHgr;·cm or less and replace a portion of the surface rubber layer, wherein the conductive rubber members are disposed in portions of the surface rubber layer extending from the outer surface to the inner surface in the radial direction of said tire discontinuously in the circumferential direction of said tire at the outer surface of the surface rubber layer in the radial direction of said tire, is provided. The pneumatic tire shows not only an excellent effect of static discharge but also excellent durability.

Abstract: A pneumatic tire comprising a tread portion which comprises a surface rubber layer which is disposed in an outer portion of the tread portion in the radial direction of said tire and has a specific resistance of 108 &OHgr;·cm or more after curing by vulcanization and conductive rubber members which comprise a rubber composition having a specific resistance of 106 &OHgr;·cm or less and replace a portion of the surface rubber layer, wherein the conductive rubber members are disposed in portions of the surface rubber layer extending from the outer surface to the inner surface in the radial direction of said tire discontinuously in the circumferential direction of said tire at the outer surface of the surface rubber layer in the radial direction of said tire, is provided. The pneumatic tire shows not only an excellent effect of static discharge but also excellent durability.

Abstract: There is provided a vulcanization mold for a pneumatic tire having a lug type or rib-lug type tread pattern, wherein a portion of the mold contributing to the formation of the tread pattern is comprised of many segments of n types (n=2 to 4), and these segments are combined so as to have at least (n+1) types of pitches each defined by an interval between mutual adjoining protrusions located on the same circumference and a difference between mutual pitches of not less than 0.5 as an index when a maximum value of the pitch is 10.

Abstract: A pneumatic tire comprising a silica-rich compound tread provided with an antistatic conductive rubber layer has improved safty based on durability and extrusion productivity. In this tire, the silica-rich compound rubber layer is divided at at least one portion in a width directional of the tire by a conductive rubber layer extended in a circumferential direction substantially over the whole thickness of said rubber layer. In this case, a thickness direction distance a in a width directional section of said rubber layer and an edge face length b of a divisional rubber layer consisting of said conductive rubber layer in a width directional section satisfy a relation formulated by the following expression, a<b.