| 摘要 |
PURPOSE:To aim at enhancing the durability of an ultra large size tire without deteriorating the lightweight measure of the tire, by making the strength of plies wound around a bead core occupying the innermost side of the bead section of the tire, greater than that of plies wound around the remaining bead cores. CONSTITUTION:A carcass 2 is composed of plies 2a wound around a first bead core 1a from the inner side to outer side of a tire, plies 2b wound around a second bead core 1b, plies 2c wound around a third bead core 1c and cut plies 2c' wrapping the all bead cores 1a-1c from the outside of the tire and reaching a position near to a bead toe 1d. In this arrangement, the number of plies is so selected that the plies 2a wound around the first bead core 1a occupying the innermost side of the bead section 1 have in particular a strength greater than that of the plies 2b, 2c wound around the remaining bead cores 1a, 1b. Further, the strength of each bead core 1a-1c is made to compete with the strength of each ply 2a-2c.
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