PNEUMATIC TIRE FOR HEAVY LOAD

PROBLEM TO BE SOLVED: To provide a pneumatic tire for heavy load which is excellent in wear resistance and structure durability and of restrains cut. SOLUTION: A tread rubber 2R includes three layers comprising a base layer 2A, an intermediate layer 2B and a surface layer 2C which are different to each another, and meets following conditions. JIS durometer A hardness is 59° or more and 72° or less, and the hardness of the three layers is as follows; hardness of the surface layer 2C ≥ hardness of the intermediate layer 2B ≥ hardness of the base layer 2A. The complex modulus of elasticity of 70°C is 4.8MPa or more and 6.4MPa or less, and the complex modulus of electricity of the three layers is as follows; complex modulus of elasticity of the surface layer 2C ≥ complex modulus of elasticity of the intermediate layer 2B ≥ complex modulus of elasticity of the base layer 2A. The loss tangent of 70°C is; loss tangent of the surface layer 2C ≥ loss tangent of the intermediate layer 2B ≥ loss tangent of the base layer 2A, and the loss tangent of the base layer 2A is 0.10 or less. The surface layer 2C and the intermediate layer 2B substantially continue between both side surfaces along the tire axial direction, and the base layer 2A is interrupted in a tread center part. The base layer 2A covers an end of a belt ply. COPYRIGHT: (C)2005,JPO&NCIPI