A tire comprising a tread having three circumferential grooves formed thereon so as to be aligned in an axial direction, wherein a width of the tread is represented as a distance in the axial direction from a first tread reference end to a second tread reference end, the tire is mountable on a vehicle such that the first tread reference end is located on an outer side in a width direction of the vehicle, an outer surface of the tire includes a tread surface and a pair of side surfaces connected to ends of the tread surface, a contour of the tread surface is represented by a plurality of arcs aligned in the axial direction in a meridian cross-section of the tire in a state where the tire is fitted on a rim that is a normal rim, an internal pressure of the tire is adjusted to 230 kPa, and no load is applied to the tire, the plurality of arcs include a pair of crown arcs (CR1, CR2) which each have a center on an equator plane of the tire and are tangent to each other at an equator of the tire, a ratio of a radius of the crown arc located on the first tread reference end side to a radius of the crown arc located on the second tread reference end side is not less than 1.10 and not greater than 1.70, among the three circumferential grooves, a first shoulder circumferential groove (38s1) and a middle circumferential groove are located in a zone from the equator to the first tread reference end, and a second shoulder circumferential groove (38s2) is located in a zone from the equator to the second tread reference end, and a total groove volume of both the first shoulder circumferential groove (38s1) and the middle circumferential groove is larger than a total groove volume of the second shoulder circumferential groove (38s2), wherein a distance from the equator to an axial inner end of the second shoulder circumferential groove (38s2) is longer than a distance from the equator to an axial inner end of the middle circumferential groove, characterized in that the middle circumferential groove includes a plurality of tapered elements, each tapered element extends in the circumferential direction, and each tapered element has a width that decreases from the heel side toward the toe side. a width of the tread is represented as a distance in the axial direction from a first tread reference end to a second tread reference end, the tire is mountable on a vehicle such that the first tread reference end is located on an outer side in a width direction of the vehicle, an outer surface of the tire includes a tread surface and a pair of side surfaces connected to ends of the tread surface, a contour of the tread surface is represented by a plurality of arcs aligned in the axial direction in a meridian cross-section of the tire in a state where the tire is fitted on a rim that is a normal rim, an internal pressure of the tire is adjusted to 230 kPa, and no load is applied to the tire, the plurality of arcs include a pair of crown arcs (CR1, CR2) which each have a center on an equator plane of the tire and are tangent to each other at an equator of the tire, a ratio of a radius of the crown arc located on the first tread reference end side to a radius of the crown arc located on the second tread reference end side is not less than 1.10 and not greater than 1.70, among the three circumferential grooves, a first shoulder circumferential groove (38s1) and a middle circumferential groove are located in a zone from the equator to the first tread reference end, and a second shoulder circumferential groove (38s2) is located in a zone from the equator to the second tread reference end, and a total groove volume of both the first shoulder circumferential groove (38s1) and the middle circumferential groove is larger than a total groove volume of the second shoulder circumferential groove (38s2), wherein a distance from the equator to an axial inner end of the second shoulder circumferential groove (38s2) is longer than a distance from the equator to an axial inner end of the middle circumferential groove, each tapered element extends in the circumferential direction, and each tapered element has a width that decreases from the heel side toward the toe side.