A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has excellent durability. The pneumatic tire has a bead portion, carcass and tread, wherein: a bead-reinforcing layer that reinforces the bead portion from outside of the carcass is provided outside of the carcass in the tire axis direction; and the pneumatic tire satisfies (formula 1) and (formula 2) below, where Wt (mm) is the cross-sectional width of the tire when the tire installed on a standardized rim and the internal pressure is 250 kPa, Dt (mm) is the outer diameter, and the virtual volume V (mm.sup.3) is the volume of the space occupied by the tire.

1600≤(Dt.sup.2×π/4)/Wt≤2827.4  (formula 1)

[(V+1.5×10.sup.7)/Wt]≤2.88×10.sup.5  (formula 2)

In a tire 22, a length from a center PM in an axial direction of a boundary 60 between a core 48 and an apex 50 to an outer edge PA of the apex 50 is not less than 10 mm and not greater than 15 mm. In a state where the tire 22 is mounted on a normal rim and an internal pressure of the tire 22 is adjusted to 10% of a normal internal pressure, a main body portion 54 of a carcass ply 52 extending along an inner surface 62 of the apex 50 is tilted relative to the axial direction, and an angle of the main body portion 54 relative to the axial direction is not less than 40° and not greater than 60°.

A pneumatic tire includes a pair of bead portions, a pair of bead cores, and a carcass extending between the bead cores. The carcass includes a carcass ply including a main portion extending between the bead cores and a pair of turn-up portions each turned up around a respective one of the bead cores from axially inside to the outside of the tire and extending radially outwardly. In at least one of the bead portions, a reinforcing rubber layer is disposed outwardly and adjacently in the tire axial direction of the turn-up portion. The reinforcing rubber layer includes a first rubber layer and a second rubber layer arranged outwardly in the tire axial direction of the first rubber layer. A loss tangent tan δ1 of the first rubber layer is smaller than a loss tangent tan δ2 of the second rubber layer.

A run-flat tire includes side reinforcing rubber between a carcass layer and an innerliner layer in sidewall portions, first bead filler rubber arranged inside folded back portions of the carcass layer, and second bead filler rubber arranged outward of the folded back portions of the carcass layer in a lateral direction and along the carcass layer. In a meridian cross-section, a radial-direction height of the first bead filler rubber is 15% or greater and 40% or less of a cross-sectional height, a radial-direction height of the second bead filler rubber is 35% or greater and 55% or less of the cross-sectional height, a linear distance from a radial-direction outer end to a radial-direction inner end of the second bead filler rubber is 20% or greater and 45% or less of the cross-sectional height, and the second bead filler rubber has a larger cross-sectional area than the first bead filler rubber.

The method is a method of manufacturing a tire, the tire-including bead cores, a bead filler-extending outward in a tire radial direction of each of the bead cores, a carcass ply extending from one bead core—to another bead core—and folded back around the bead cores, and an electronic component, the method comprising: a covering step of covering the electronic component with coated rubber; a recess forming step of forming, in the bead filler, a recess-having a shape corresponding to a shape of the coated rubber; and a disposing step of disposing the coated rubber, which at least partially covers the electronic component, in the recess-in the bead filler.

A tire includes: a bead filler extending to an outer side in the tire-radial direction of a bead core; a carcass ply folded around the bead core; a steel chafer arranged so as to cover the carcass ply around the bead core; a first pad covering an outer side in the tire-width direction of a folding end of the carcass ply, at the outer side in the tire-radial direction of the end part of the steel chafer; a second pad covering an outer side in the tire-width direction of the first pad; and side wall rubber covering at least part of the outer side in the tire-width direction of the second pad, in which an electronic component is provided between the second pad and the side wall rubber.

The present invention relates to new vulcanisable elastomeric compositions for components of tyres, comprising modified silicate fibres as fillers. The silicate fibres are modified according to the process with controlled pH of the invention. In addition, the invention regards components of tyres, comprising elastomeric materials obtainable by vulcanisation of said compositions, and tyres for vehicles comprising one or more of said components. The vulcanised elastomeric materials according to the invention are characterised by good static and dynamic mechanical properties, in particular by particularly low hysteresis. Advantageously the tyres of the invention comprising one or more of said components have a limited rolling resistance.

A pneumatic tire of the present disclosure includes: a pair of bead cores embedded in a pair of bead portions, the pair of bead cores each including a pair of small bead cores divided in a tire width direction; and a carcass including one or more carcass plies, the carcass toroidally straddling between the pair of bead cores with end portions of the carcass each sandwiched between the pair of small bead cores and engaged with the small bead cores, in which a sound control body is disposed on an inner surface of the tire in the pair of bead portions.

A pneumatic tire includes a run-flat reinforcing layer disposed on an inner side in a width direction of a carcass layer, and a second filler disposed between a turned back portion of the carcass layer and a rim cushion rubber. Additionally, a point on a tire outer circumferential surface is defined, the point is located at a position corresponding to 150% of a rim flange height from a measurement point of a rim diameter of a specified rim, a perpendicular line is defined, and the perpendicular line is drawn from the point to a tire inner circumferential surface. A rubber gauge (G1) of the run-flat reinforcing layer on the perpendicular line, and a rubber gauge (G2) of a region from the turned back portion of the carcass layer to a tire outer surface have the relationship 0<G1/G2≤0.65.

A tire 32 includes: a pair of beads 40; a carcass ply 82 having a ply main body 84 and turned-up portions 86; and a pair of fillers 52 that are located outward of the turned-up portions 86 in the axial direction and that include metal cords. In a radial direction, a first end 92 of each filler 52 is located inward of a bead base line, and a second end 94 of each filler 52 is located between an end 88 of the turned-up portion 86 and the bead base line. A recess 96 is provided on a zone of each side surface 34 of the tire 32 between a maximum width position and the end 88 of the turned-up portion 86.