| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pneumatic tire excellent in bead part durability for preventing the occurrence of separation on the rolling-up end of carcass ply and eliminating the possibility of fatigue failure of bead parts. SOLUTION: At least single carcass ply composed of a steel cord is provided with a carcass body 1 extending in a toroidal shape up to bead parts through a sidewall part from a tread part and a rolling-in part 4 for winding a part or the whole of a rolling-back part along a peripheral surface of a bead core 3 by rolling back the ply outside from the tire radial directional inside around the bead core embedded in the respective bead parts, and in a tire width directional cross section of a no-load state of adjusting internal pressure to maximum air pressure by installing a tire on a standard rim, a prescribed shape is imparted to the carcass body.</p> |
