Sughrue, Rothwell, Mion, Zinn and Macpeak
Radial tire for heavy load vehicles
 A radial tire for heavy load vehicles such as light trucks, trucks, busses, super-large type construction vehicles, etc. is disclosed. The radial tire comprises a carcass ply composed of a steel cord ply and wound around a bead core from the inside toward the outside thereof to form a turn-up portion. The upper end of the turn-up portion is upwardly extended to a position located between a point passing over the maximum width point of the carcass ply expanded by applying an internal pressure to the tire and a point where a normal drawn perpendicular from a hump to the carcass ply crosses with the carcass ply. The turn-up portion of the carcass ply is separated from the carcass ply by means of a soft rubber layer composed of rubber having a Shore A hardness which is smaller than a Shore A hardness of a coating rubber of the carcass ply and a 300% modulus of elasticity which is 50% to 85% of a 300% modulus of elasticity of the coating rubber of the carcass ply. 
Bridgestone Tire Company Limited
B Y B B B B B B Y Y
B60C Y10T B60C B60C B60C B60C B60C B60C Y10T Y10T
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Toshiro Yasuo Shigeru Akira
Tezuka Suzuki Sugihara Tamura