Pneumatic tires for heavy loads

摘要

PROBLEM TO BE SOLVED: To provide a pneumatic tire for heavy load having excellent wet traction property and chipping resistance. SOLUTION: The cap tread rubber contains at least a diene rubber and carbon black having a nitrogen adsorption specific surface area (N2SA) of 100 m2 / g or more, and in 100 parts by mass of the diene rubber, a natural rubber and / or a synthetic isoprene rubber. The ratio is 90 parts by mass or more, the blending amount of carbon black is 40 to 70 parts by mass with respect to 100 parts by mass of the diene rubber, and the breaking stress (TBcap) and breaking elongation (EBcap) of the cap tread rubber at 100 ° C. The ratio of the product of) to the 300% modulus (M300BC) of the belt cushion rubber at 100 ° C. satisfies 1000 ≦ {(TBcap) × (EBcap)} / (M300BC) ≦ 2000. [Selection diagram] Fig. 1