| 摘要 |
PURPOSE:To improve crack resistant characteristic of a product to a large degree by using a tire tread primarily comprising conventional natural rubber for a radial tire for heavy load, while there is no change in the total life of the tire compared with a conventional one. CONSTITUTION:For a radial tire for heavy load, having a plurality of ribs divided in the width direction on a tread 1 by a groove 2 in the circumferential direction, its tread main body part 3 is formed out of natural rubber, while a rubber surface layer 4 including NR/BR, i.e., 30-85PHR of natural rubber (NR), and 15-70PHR of butadien rubber (BR), is formed on the entire tread surface including a groove part, from the top surface of the rib, at 0.3mm or more in thickness and at 3mm or less in range.
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