| 摘要 |
A pneumatic radial tire for use in heavy duty vehicles such as an airplane and so on comprises at least one carcass ply as a tire body reinforcement, at least two belt layers as a tread reinforcement, and a tread provided with a pair of main grooves extending circumferentially of the tread at a position ranging from the side end of the tread within 15 DIFFERENCE 40% of tread ground contact width. In this tire, the tread is composed of a tread rubber satisfying a requirement that modulus at 100 DEG C. under 100% elongation of tread rubber constituting each side portion of the tread is lower by a range of 30 DIFFERENCE 80% than that of tread rubber constituting a central portion of the tread.
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