Heavy duty tire

A heavy duty tire comprising a carcass extending from a tread part through a sidewall part to a bead core of a bead part and a belt layer arranged outside in a tire radial direction of the carcass and inside of the tread part,

• wherein the belt layer is formed by a belt ply comprising a first belt layer, a second belt layer, and a third belt layer which are laminated in order from inside in the tire radial direction,
• wherein the tread has a plurality of main grooves extending continuously in a tire circumferential direction,
• wherein the tread comprises a cap rubber layer constituting a tread surface and a base rubber layer adjacent to inside in a tire radial direction of the cap rubber layer,
• wherein the cap rubber layer and the base rubber layer are composed of a rubber composition comprising a rubber component,
• wherein the rubber component constituting the cap rubber layer comprises an isoprene-based rubber and a styrene-butadiene rubber,
• wherein the rubber composition constituting the cap rubber layer comprises 30 parts by mass or more of silica having a nitrogen adsorption specific surface area (N2SA) of 180 m2/g or more based on 100 parts by mass of the rubber component, and
• wherein a tan δ of the rubber composition constituting the base rubber layer at 70° C. is 0.04 to 0.07.