Bridgestone Corporation

Bridgestone Metalpha Corporation

Kazuto Fujita

Hiroyuki Matsumoto

Naohiko Obana

Motonori Bundo

Shuichi Onuma

Mitsunori Wada

Takashi Suzuki

Masami Aoki

Masahiro Takayama

Hiroyuki c/o Bridgestone Corp Tec Ce Matsumoto

This invention relates to a tire-rim assembly which is easily produced at low cost, excellent in durability and capable of notably reducing road noise, and more particularly to a tire-rim assembly comprising a pneumatic tire (), a rim () and a sponge member () disposed in a tire internal cavity () defined by the pneumatic tire () and the rim (), characterized in that the sponge member () has a specific gravity of higher than 0.06 but not higher than 0.25 and/or an air permeability of not higher than 5 cc/cm/sec.

Tire-rim assembly and sponge member used in the same

A pneumatic tire has a block pattern of a tread defined by a plurality of circumferential grooves extending in a circumferential direction of the tread and a plurality of lateral grooves each extending across the circumferential grooves and tread ends, wherein specified chamfered face, sipe or fine groove is formed in each block of all block rows to improve a self-aligning torque in the high-speed running of a vehicle.

Pneumatic tire having excellent steering stability

Pneumatic tire having excellent steering stability and chamfered blocks

A steel cord for the reinforcement of rubber articles exhibits largely different bending rigidities in two crossing directions at section of the cord and comprises a bundle of plural strands each being obtained by twisting 3 or more steel filaments and a wrapping filament helically wound around the bundle. The steel filaments have a twisting pitch in the range of 3.0 to 30.0 mm. A single wrapping filament is helically wound around the bundle at a twisting pitch of 2.0-15 mm. Various cord structures may be used, for example, 1.times.3, 1.times.5, 2+6 and 3.times.4.

Steel cords for the reinforcement of rubber articles having a wrapping

A steel cord for the reinforcement of rubber articles exhibits largely different bending rigidities in two crossing directions at section of the cord and comprises a bundle of plural strands each being obtained by twisting 3 or more steel filaments and a wrapping filament helically wound around the bundle.

Steel cords for the reinforcement of rubber articles and having a

A pneumatic tire having an improved uniformity at tire-wheel assembled state includes a pair of bead portions each closely fitted to a slant bead seat of a standard rim when the tire is mounted on the standard rim, the standard rim including for each bead portion, a rounded concave corner portion smoothly connected to the corresponding slant bead seat and a flange protrusively extending outward from the corresponding rounded concave corner portion and having a curved portion. In this tire, each bead portion has an expanded heel bringing about close fitting to the corresponding rounded concave corner portion prior to a contact between the corresponding curved portion and the corresponding bead portion.

Pneumatic tires having improved uniformity at tire-wheel assembled state

In a rim-fitted tire, a plurality of static unbalance correction weights are fixed in such a manner as to be distributed on both sides of a reference plane substantially perpendicular to the axial direction of a rim, and a plurality of dynamic unbalance correction weights, corresponding to amounts of correction of dynamic unbalance obtained with the static unbalance correction weights fixed, are fixed, thereby correcting weight unbalance.

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Kodaira, Japan

Kazuto Fujita