| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic radial tire excellent in high speed durability, reducing road noise and a flat spot and reduced in cost by using a specific organic fiber cord only for a shoulder region of a belt reinforced layer and using a nylon cord for a remaining central region. SOLUTION: Cord materials used for the belt reinforced layer of this pneumatic radial tire are made different from each other for the tire central region and the shoulder region in the same tire, the cord material for the tire central region is nylon and the cord material for the shoulder region is poly-ketone made of a repeated unit expressed by an expression (1) (A in the expression can be the same or different in each of the repeated units in a part derived from an ethylene unsaturated compound polymerized by ethylene bonding ). COPYRIGHT: (C)2005,JPO&NCIPI
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