Pneumatic tire

A pneumatic tire comprising

• a tread having an outer surface that is a tread surface that comes into contact with a road surface,
• wherein
• the tread includes a plurality of ribs that extend in a circumferential direction, and are aligned in an axial direction,
• a rib, among the ribs, disposed at an equator plane of the tire, or near the equator plane, is a crown rib, and a rib, among the ribs, disposed on an outer side in the axial direction is a shoulder rib,
• the crown rib is not disposed at the equator plane of the tire,
• an outer surface of the crown rib and an outer surface of the shoulder rib form a part of the tread surface,
• on a cross-section of the tire along a plane that includes a rotation axis of the tire,
• a ratio of a width, in the axial direction, of the tread surface relative to a maximum width of the tire is not less than 0.7 and not greater than 0.9,
• an outline of the outer surface of the crown rib is represented as a first arc, and a center of a circle to which the first arc belongs is disposed on the equator plane,
• an outline of the outer surface of the shoulder rib is represented as a second arc, and
• a ratio of a distance from a center of a chord of the second arc to the second arc relative to a length of the chord of the second arc is not less than 0.036 and not greater than 0.050.