| 摘要 |
A heavy duty tire comprises bead portions ( 4 ) each with a bead core ( 5 ), and a carcass ply ( 6 A) comprising a main portion ( 6 a) extending between bead portions and a pair of edge portions ( 6 b) winded around the bead cores ( 5 ), the winded edge portion ( 6 b) comprises a turnback part ( 11 ) extending axially inwardly from a position (P0) on the axially outside of the bead core ( 5 ), an auxiliary cord layer ( 8 ) is disposed on the radially outside of the turnback part ( 11 ), whereby the end ( 11 e) of the turnback part ( 11 ) is positioned at a distance (u 1 ) of from 2.0 to 8.0 mm from the radially outer surface (su) of the bead core. In a normally inflated unloaded state of the tire, the turnback part ( 11 ) is curved such that the diameter of the turnback part ( 11 ) decreases continuously from the end ( 11 e) to the position (P 0 ).
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