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 extending in a tire circumferential direction, the plurality of main grooves 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 (d3) of 80% of the maximum depth (d2) to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth (d2) of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion , the plurality of main grooves includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness (d4) at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness (d1) 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 extending in a tire circumferential direction, the plurality of main grooves 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 (d3) of 80% of the maximum depth (d2) to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth (d2) of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion , the plurality of main grooves includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness (d4) at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness (d1) of the tread portion . the tread portion comprises a plurality of main grooves extending in a tire circumferential direction, the plurality of main grooves 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 (d3) of 80% of the maximum depth (d2) to a groove width L0 at the ground contacting face of the tread portion is 0.3 to 0.7, a maximum depth (d2) of the first main groove is 0.30 to 0.60 times a maximum thickness of the tread portion , the plurality of main grooves includes a second main groove located most inboard when mounted on the vehicle, and a rubber thickness (d4) at the groove bottom of the second main groove is 0.05 to 0.25 times the maximum thickness (d1) of the tread portion . <EOS>