A tire whose orientation when mounted on a vehicle is specified and which has a tread portion made of an elastomeric compound, wherein with respect to tanδ of the elastomeric compound measured under a strain condition of a frequency of 10 Hz, 10% initial strain, and 2% dynamic strain, -10 degree C tanδ which is the tanδ at -10 degrees C, 40 degree C tanδ which is the tanδ at 40 degrees C, and 70 degree C tanδ which is the tanδ at 70 degrees C satisfy the following expressions and: − 10 degree C tan δ ≤ 0.75 40 degree C tan δ − 70 degree C tan δ ≤ 0.10 characterized in that the tread portion comprises a plurality of main grooves (11, 12, 13) extending in a tire circumferential direction, the plurality of main grooves (11, 12, 13) includes a first main groove located most outboard when mounted on the vehicle, in the first main groove, a ratio L80/L0 of a groove width L80 at a depth of 80% of the maximum depth to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion, the plurality of main grooves (11, 12, 13) includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness of the tread portion. -10 degree C tanδ which is the tanδ at -10 degrees C, 40 degree C tanδ which is the tanδ at 40 degrees C, and 70 degree C tanδ which is the tanδ at 70 degrees C satisfy the following expressions and: − 10 degree C tan δ ≤ 0.75 40 degree C tan δ − 70 degree C tan δ ≤ 0.10 characterized in that the tread portion comprises a plurality of main grooves (11, 12, 13) extending in a tire circumferential direction, the plurality of main grooves (11, 12, 13) includes a first main groove located most outboard when mounted on the vehicle, in the first main groove, a ratio L80/L0 of a groove width L80 at a depth of 80% of the maximum depth to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion, the plurality of main grooves (11, 12, 13) includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness of the tread portion. the tread portion comprises a plurality of main grooves (11, 12, 13) extending in a tire circumferential direction, the plurality of main grooves (11, 12, 13) includes a first main groove located most outboard when mounted on the vehicle, in the first main groove, a ratio L80/L0 of a groove width L80 at a depth of 80% of the maximum depth to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion, the plurality of main grooves (11, 12, 13) includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness of the tread portion.