| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a bead part. SOLUTION: An acute angle side inclinationαto the bead core axis C of an extension part 10a on a bead core surface 4a for turning a carcass cord 10 to the bead base 3a side in a winding part 7 of carcass ply 5 is set in a range of 60 deg. to 90 deg., and a difference between the inclinationαand an acute angle side inclinationβto the bead core axis C of an extension part 10c on a separate surface 4c separate by one surface 4b to the winding directional front side of the carcass ply 5 to the bead core surface 4a for turning the carcass cord 10 to the bead base 3a side is set not more than 20 deg..
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