Abstract: An object of the present invention is to improve propulsion performance on a snow-covered road surface, and provided is a tire with a tread portion having a groove, wherein the cap rubber layer forming the tread portion contains 40 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 its rubber component, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and is formed from a rubber composition having a loss tangent 10° C. tan ? measured under the conditions of temperature of 10° C., frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1% and in deformation mode; tensile of less than 0.28, and a glass transition temperature Tg (° C.) of ?40° C. or lower; and the glass transition temperature Tg (° C.) and the depth G(mm) of the groove satisfy Tg??0.5×G?35.

Abstract: Provided is a tire with a tread portion having a circumferential groove communicating in the circumferential direction, wherein the cap rubber layer forming the tread portion is formed from a rubber composition which contains 40 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, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and has a loss tangent 10° C. tan ? of less than 0.28, and a glass transition temperature Tg (° C.) of ?40° C. or lower; and the glass transition temperature Tg (° C.) and the depth G (mm) of the circumferential groove satisfy Tg??0.5×G?35; and an object of the present invention is to improve off-road performance of a tire.