PNEUMATIC TIRE FOR HEAVY LOAD

摘要

PROBLEM TO BE SOLVED: To improve ice braking performance without spoiling wear resistance.SOLUTION: A pneumatic tire for heavy load that includes a tread rubber part 16 sectioned into a center block array 24, a pair of shoulder block arrays 28, and a pair of intermediate block arrays 26 therebetween by four peripheral main grooves 22 has the tread rubber part 16 composed of a cap rubber layer 18 and a base rubber layer 20, and a 30% modulus of the cap rubber layer is made larger than a 300% modulus of the base rubber layer. Further, the ratio H1C/H1 of the sectional area H1 of the center block 30 to the sectional area H1C of the cap rubber layer 18 of a center block is set to be 0.7-0.9, the ratio H2C/H1C of the H1C to the sectional area H2C of the cap rubber layer of an intermediate block 32 is set to be 1.0-1.2, and the ratio H3C/H2C of the H2C to the sectional area H3C of the cap rubber layer of a shoulder block 34. is set to be 1.0-1.2.