TIRE

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 δ 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.