A pneumatic tire is provided that enables communication performance and scratch resistance of a transponder to be improved, A transponder (20) that extends along a tire circumferential direction is embedded between a carcass layer (4) and an innerliner layer, and the transponder (20) is disposed between a position (P1) located on an outer side of and 15 mm away from an upper end (5e) of a bead core (5) in a tire radial direction and a position (P2) located on an inner side of and 5 mm away from an end (7e) of a belt layer (7)in the tire radial direction.

Provided is a pneumatic tire. A band-like sound absorptive member is fixed to the inner surface of a tread portion along the tire circumferential direction. An end portion in the tire width direction of the sound absorptive member is located on the outer side in the tire width direction with respect to a shoulder main groove located on the outermost side in the tire width direction. A width W1 of the sound absorptive member in the tire width direction and a tread development width TDW of the tread portion satisfy a relationship of 0.65≤(W1/TDW)≤0.90. The width W1 of the sound absorptive member and a belt width W2 of a first belt ply having the maximum width of a belt layer satisfy a relationship of 0.70≤(W1/W2)≤0.95.

In this pneumatic tire, a tan δ value T20 of a rubber member, which constitutes at least one of a bead filler, an undertread, a sidewall rubber, and a rim cushion rubber, at 20° C. and a tan δ value T60 of the rubber member at 60° C. satisfy 0.50≤T20/T60≤2.00 and T20≤0.22. Additionally, the tan δ value T20 of the rubber member at 20° C. is in a range T20≤0.15. Additionally, a tan δ value T20_sw of the sidewall rubber at 20° C. and a tan δ value T60_sw of the sidewall rubber at 60° C. satisfy 0.50≤T20_sw/T60_sw≤1.50 and T20_sw≤0.11.

A pneumatic tire has a bead portion provided with a bead core and a bead apex rubber. The bead apex rubber extends radially outward from the radially outer surface of the bead core, and has a radially outer end not positioned in a first region. The first region is defined between a first radial line and a second radial line. The first radial line extends straight through a radially outer end of a contact area where the bead portion comes into contact with a flange of a wheel rim. The second radial line extends straight through a position spaced 10 mm axially outward from the radially outer end of the contact area.

A pneumatic tire includes a pair of bead portion, a pair of bead cores, a carcass extending between the pair of bead cores, and a pair of bead apex rubbers. Each bead core includes a core inner surface on an inner side in the tire radial direction of the bead core. In a pre-assemble state, each core inner surface has an angle of 20 degrees plus/minus 2 degrees to the tire axial direction, and is inclined outwardly in the tire radial direction toward an outer side in the tire axial direction. The bead apex rubber includes a first rubber portion arranged so as to cover a circumference of the bead core and having a circular or substantially elliptical outline, and a second rubber portion tapering outwardly in the tire radial direction from the first rubber portion. The first rubber portion is greater in hardness than the second rubber portion.

A pneumatic tire includes a transponder extending along a circumferential direction embedded between a position (P1) located on an outer side of and 15 mm away from an upper end of a bead core in a radial direction and a position (P2) located on an inner side of and 5 mm away from an end of a belt layer in the radial direction, and a tire inner surface in which a release agent layer made of a release agent is formed has a surface electric resistivity of 10.sup.9 Ω.Math.cm to 10.sup.15 Ω.Math.cm. The transponder extending along the circumferential direction is embedded between the position (P1) and the position (P2), and the amount of silicon of the release agent at least in the tire inner surface corresponding to an embedment section for the transponder is 10.0 wt % or less or a thickness of the release agent is 100 μm or less.

Provided is a run-flat tire. A first bead filler is disposed on an outer circumferential side of a bead core, a second bead filler is disposed on an outer side in a tire width direction of a turned up portion of the carcass layer along the turned up portion of the carcass layer, and a thickness G on a first reference line of a side reinforcing layer, a thickness G1 on a second reference line of the side reinforcing layer, and a thickness G2 on a third reference line of the side reinforcing layer satisfy the relationships of 0.8×G≤G1≤1.0×G and 0.5×G≤G2≤0.7×G.

A pneumatic tire includes a pair of bead portion, a pair of bead cores, a carcass extending between the pair of bead cores, and a pair of bead apex rubbers. Each bead core includes a core inner surface on an inner side in the tire radial direction of the bead core. In a pre-assemble state, each core inner surface has an angle of 20 degrees plus/minus 2 degrees to the tire axial direction, and is inclined outwardly in the tire radial direction toward an outer side in the tire axial direction. The bead apex rubber includes a first rubber portion arranged so as to cover a circumference of the bead core and having a circular or substantially elliptical outline, and a second rubber portion tapering outwardly in the tire radial direction from the first rubber portion. The first rubber portion is greater in hardness than the second rubber portion.

A pneumatic tire comprises: a bead portion provided with an inside bead apex rubber disposed between a turned up portion and a main portion of a carcass ply, and an outside bead apex rubber disposed axially outside the turned up portion and having a radially outer edge; and a the sidewall portion provided with a sidewall reinforcing cord layer disposed axially outside the carcass and having a radially inner edge which is spaced apart from the radially outer edge of the outside bead apex rubber by a radial distance of not less than 5% of a tire section height.

The present invention provides a run-flat tire excellent in run-flat durability. In the run-flat tire, a vulcanized rubber of a rubber composition containing a rubber component and a vulcanization accelerator that contains tetrabenzylthiuramdisulfide is used for at least one member selected from the group consisting of a side-reinforcing rubber layer and a bead filler. In the vulcanized rubber of the run-flat tire, a proportion of monosulfide bonds and disulfide bonds in all sulfide bonds is 65% or more.