Pneumatic radial tire for a passenger car having ultra fine steel cords for a carcass ply

摘要

Disclosed is a pneumatic radial tire for a passenger car having ultra fine steel cords (100) for a carcass ply in which adhesive force between a carcass ply layer and a side wall or a rim flange rubber adjacent to a turn up portion on an outside and a stiffness of the rim flange rubber are larger than a bending stiffness of the carcass ply layer so as to improve durability of a bead part while reducing poor air inletting generated at a carcass turn up portion.