Radial tire for heavy load vehicles including a rubber reinforcing layer between belt and tread

摘要

A radial tire for heavy load vehicles having a steel cord- reinforced belt interposed between the carcass of radial structure and the tread, which comprises a rubber reinforcing layer extending from the center toward the edges along the inside of the tread and having at least one quarter the tread width, said rubber reinforcing layer being made of a rubber composition containing resorcin or a resorcin derivative as a reinforcing agent in addition to carbon black and silica and also containing hexamethylenetetramine or a melamine derivative as a methylene donor, said rubber reinforcing layer having a reinforcing factor of 2.2 to 5.7 which is defined by {square root}E'·d [where E' denotes the dynamic modulus (MPa) of the rubber reinforcing layer and d denotes the thickness (mm) of the rubber reinforcing layer].