A tire comprising: a tire frame member that is formed from a thermoplastic resin material, and that has side portions that extend towards an outer side in a tire radial direction from a bead portion, and a crown portion that extends towards an inner side in a tire width direction from the side portions; a reinforcing layer that is disposed at an outer side in the tire radial direction of the tire frame member, and that has a higher bending rigidity than outer circumferential portions of the tire frame member; and a tread that is formed from a rubber material and is disposed on the outer side in the tire radial direction of the reinforcing layer; characterised in that: a plurality of width direction grooves (118, 144) are provided at the tread at intervals in a tire circumferential direction, and extend in the tire width direction in which mutually facing groove wall surfaces of width direction grooves (118, 144) do not make contact with each other when the tread is in contact with the ground, wherein an aperture surface area of one of the width direction grooves (118, 144) within a total ground contact surface of the tread of one circumferential portion of the tire is 0.02% or less relative to a surface area of a total ground contact surface of the tread of one circumferential portion of the tire, the total ground contact surface being a surface area obtained by multiplying the ground contact width of the tread, measured as described herein, by the length in the circumferential direction of the tread of one circumferential portion of the tire. a tire frame member that is formed from a thermoplastic resin material, and that has side portions that extend towards an outer side in a tire radial direction from a bead portion, and a crown portion that extends towards an inner side in a tire width direction from the side portions; a reinforcing layer that is disposed at an outer side in the tire radial direction of the tire frame member, and that has a higher bending rigidity than outer circumferential portions of the tire frame member; and a tread that is formed from a rubber material and is disposed on the outer side in the tire radial direction of the reinforcing layer; characterised in that: a plurality of width direction grooves (118, 144) are provided at the tread at intervals in a tire circumferential direction, and extend in the tire width direction in which mutually facing groove wall surfaces of width direction grooves (118, 144) do not make contact with each other when the tread is in contact with the ground, wherein an aperture surface area of one of the width direction grooves (118, 144) within a total ground contact surface of the tread of one circumferential portion of the tire is 0.02% or less relative to a surface area of a total ground contact surface of the tread of one circumferential portion of the tire, the total ground contact surface being a surface area obtained by multiplying the ground contact width of the tread, measured as described herein, by the length in the circumferential direction of the tread of one circumferential portion of the tire. a plurality of width direction grooves (118, 144) are provided at the tread at intervals in a tire circumferential direction, and extend in the tire width direction in which mutually facing groove wall surfaces of width direction grooves (118, 144) do not make contact with each other when the tread is in contact with the ground, wherein an aperture surface area of one of the width direction grooves (118, 144) within a total ground contact surface of the tread of one circumferential portion of the tire is 0.02% or less relative to a surface area of a total ground contact surface of the tread of one circumferential portion of the tire, the total ground contact surface being a surface area obtained by multiplying the ground contact width of the tread, measured as described herein, by the length in the circumferential direction of the tread of one circumferential portion of the tire.