| 摘要 |
<p>A pneumatic tire comprises a carcass extending between bead portions, and a belt disposed radially outside the carcass in the tread portion, at least one of the carcass and belt comprises a PEN cord ply of a polyethylene-2,6-naphthalate fiber cord, the polyethylene-2,6-naphthalate fiber cord having a total denier number of from 2500 to 3600, a twist number of from 30 to 40 turns/10 cm, an initial stage modulus at 25 deg.C which is in a range of from 50 to 65 gf/d, and a variation of the initial stage modulus in a temperature range between 25 deg.C to 70 deg.C which is not more than 20 % in absolute value.</p> |
