Production method of bias tire, and bias tire

摘要

PPROBLEM TO BE SOLVED: To provide a bias tire attained in light weight and capable of enhancing productivity by suppressing a variation of a shape of the periphery of a bead core. PSOLUTION: In the T type emergency bias tire 10 for the passenger car, an inclination angle of a ply cord relative to a tire rotation axis is set to 60° or larger on a tire equator surface CL. By setting a ratio A/B of the hitting number A of the ply cords per a distance of 25 mm in an arrangement direction of the ply cord and the number B of a steel wires when a bead core 12 is sawn at a cross section into a range of 1.2-1.7, the light weight of the bead core 12, and the suppression of the rotation of the bead core accompanied by the thermal contraction of the ply cord, namely, the suppression of the shape deformation of the periphery of the bead core can be made compatible. PCOPYRIGHT: (C)2010,JPO&INPIT