HEAVY-DUTY TIRE

A heavy-duty tire having excellent uneven wear resistance is provided.The heavy-duty tire includes a tread portion having a pair of crown main grooves 4 continuously extending in a tire circumferential direction and provided at both sides of a tire equator, and a pair of shoulder main grooves 5 provided between the crown main grooves and tread edges Te. The tread portion has one crown land portion 8, a pair of middle land portions 7 and a pair of shoulder land portions 9. At least one of the shoulder land portions 9 has shoulder lateral grooves 29 extending in a tire axial direction. Wc, Wm and WS satisfy the following formula (1). A maximum length Lsm in the tire axial direction (mm) of the shoulder lateral grooves 29 and Ws satisfy the following formula (2). A total length Lst in the tire axial direction (mm) of the shoulder lateral grooves 29 and a tire outer diameter H (mm) satisfy the following formula (3). The tread portion containing 90% by mass or greater of an isoprene-based rubber, and carbon black having an average particle diameter of not greater than 20 nm and/or a cetyltrimethylammonium bromide adsorption specific surface area of not less than 130 m2/g