Sumitomo Rubber Industries Limited

Sumitomo Electric Tochigi Co., Ltd.

Momoka Misaki

Takashi Miki

Hiroki Kawai

Masumi Suzuki

Shingo Ishida

Dong Miao

Natsuki Maekawa

Yuta Miseki

Kawai Hiroki

Akifumi Matsuoka

Shinichi Yoshida

To provide a pneumatic tire excellent in steering stability and fuel efficiency at high-speed driving, it is provided a pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein a monofilament cord is used as a reinforcing cord for the belt layer; the number of arrangements e (lines/5 cm) of the monofilament cords arranged per 5 cm in the tire width direction in the tire radial cross section of the belt layer is 50/5 cm or more; and the distance G (mm) from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and the loss tangent (30° C. tan δ) when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature: 30° C., initial strain: 5%, dynamic strain: ±1%, frequency: 10 Hz, and deformation mode: tensile, satisfy 30° C. tan δ×G<1.5.

Pneumatic tire

To provide pneumatic tires with excellent ride quality during high-speed driving, a pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein a monofilament cord is used as a reinforcing cord for the belt layer; and the number of arrangements e (lines/5 cm) of the monofilament cords per 5 cm in the tire width direction in the tire radial cross section of the belt layer, the distance G (mm) from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and the loss tangent (30° C. tan δ) when the rubber composition constituting the surface of the tread portion is measured satisfy (30° C. tan δ×G)/e>0.015 is provided.

To provide a pneumatic tire in which both low rolling resistance and improvement of noise performance at high-speed driving are sufficiently achieved, it is provided a pneumatic tire having a tread portion and a belt layer, wherein the tread portion is arranged on the outer side of the belt layer in the tire radial direction, the reinforcing cord in the belt layer is composed of cords made of monofilaments in which 50 lines/5 cm or more of the monofilaments are arranged in the tire width direction in the tire radial cross section of the belt layer, and the maximum load capacity of the tire WL (kg) and the weight of the tire WT (kg) satisfy 0.0145&#x2264;(WT/WL).

To provide a pneumatic tire excellent in steering stability and durability at high-speed driving, it is provided a pneumatic tire having a tread portion and a belt layer, wherein the tread portion is arranged on the outer side of the belt layer in the tire radial direction, the reinforcing cord in the belt layer is composed of cords made of monofilaments in which 50/5 cm or more of the monofilaments are arranged in the tire width direction in the tire radial cross section of the belt layer, and the maximum load capacity of the tire WL (kg) and the weight of the tire WT (kg) satisfy (WT/WL)&#x2264;0.0140.

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Kobe, Japan

Momoka Misaki