Heavy-duty tire

A heavy-duty tire comprising:

• a tread portion comprising a pair of tread edges and a tire equator located therebetween, wherein
• in a tire cross-section including a tire axis under a 5% inner pressure condition where the tire is mounted on a standard wheel rim and inflated to 5% of a standard pressure but loaded with no tire load,
• the tread portion has a profile comprising a first profile including the tire equator, a pair of second profiles extending axially inwardly from the tread edges, and a pair of third profiles connecting the first profile and the respective second profiles,
• wherein
• the first profile and the second profiles are configured as arc shapes protruding outwardly in a tire radial direction having respective centers internal to the tire, and the third profiles are configured as straight shapes,
• wherein:
• the tread portion is provided with a pair of circumferentially and continuously extending crown main grooves located such that the tire equator C is therebetween, and a pair of circumferentially and continuously extending shoulder main grooves located axially outwardly of the crown main grooves to form a crown land portion between the pair of crown main grooves, a pair of middle land portions between the crown main grooves and shoulder main grooves, and a pair of shoulder land portions disposed axially outwardly of the shoulder main grooves,
• radially outer surfaces of the crown land portion and the pair of middle land portions consist of the first profile,
• the pair of shoulder land portions includes the respective tread edges, and
• a radially outer surface of each of the pair of shoulder land portions consists of the third profile and the second profile that extends from the tread edge to the third profile,
• wherein
• on each side of the tire equator, a connecting point of the second profile and the third profile is located on the shoulder land portion,
• wherein
• the shoulder land portion is provided with a circumferentially and continuously extending shoulder auxiliary groove having a narrower width than that of the shoulder main groove to divide the shoulder land portion into a main portion on a side of the shoulder main groove and an auxiliary portion on a side of the tread edge, and
• on the main portion, a ratio A3/A2 of an axial length A3 of the third profile to an axial length A2 of the second profile is from 4 to 9, and
• wherein
• the main portion comprises an axially inner half region and an axially outer half region when the main portion is divided equally into two axial regions in the 5% inner pressure condition, and
• under a standard loaded condition where the tire is mounted on the standard wheel rim and inflated to the standard pressure and loaded with a standard tire load at zero camber angle on a plane, a ratio P2/P1 of an average ground contact pressure P2 of the outer half region to an average ground contact pressure P1 of the inner half region is of from 0.80 to 0.90.