| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability of a bead part while improving rim assembling performance and rim shift resisting performance. SOLUTION: In a loading condition X in which a tire is loaded in a rim J, the inner diameterϕBC of the radial direction innermost end of a bead core 6 is set lower than the inner diameterϕBT of a heel point 13 as a crossing point between the extended surfaces of a bead base surface 10 and the rising surface of the rim J in contact with a flange.
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