Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorsAyuko YAMADA, Kentaro NAKAMURA
Life of this patent
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Abstract
It is provided a tire having a tread portion, wherein the cap rubber layer forming the tread portion is formed from a rubber composition containing 60 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber having a styrene content of 25% by mass or less in 100 parts by mass of the rubber component, and containing 100 parts by mass or less of silica with respect to 100 parts by mass of the rubber component, whose loss tangent (30° C. tan δ) is 0.25 or less; and the thickness of the tread portion is 6 mm or more and 12 mm or less; and an object of the present invention is to improve rolling resistance at the time of starting.
Claims14
A tire having a tread portion, wherein
- the cap rubber layer forming the tread portion is formed from a rubber composition containing 60 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber (SBR) having a styrene content of 25% by mass or less in 100 parts by mass of the rubber component, and containing 100 parts by mass or less of silica with respect to 100 parts by mass of the rubber component, whose loss tangent (30° C. tan δ) measured in deformation mode:
- tensile under the conditions of temperature of 30° C., frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1% is 0.25 or less;
- and
- the thickness of the tread portion is 6 mm or more and 12 mm or less.
Dependencies are inferred from the claim text.