Sughrue, Rothwell, Mion, Zinn and Macpeak
Radial tire having a highly durable bead structure
 A radial tire having a highly durable bead structure, comprising a carcass ply having a high modulus of elasticity is disclosed. The bead is constructed to satisfy the following conditions, i.e., EQU h.sub.2 = (1/10 to 1/2)h.sub.0, and (1) EQU d = (1/30 to 1/5)D (2) where h.sub.0 is a vertical height of the upper end of a turn up portion of the carcass ply measured from a base of the bead, h.sub.2 is a vertical distances from the upper end of the turn up portion of the carcass ply to the upper end of an inner reinforcing cord layer, after the tire has been mounted and inflated d is an interlayer gauge of a space formed between the turn up portion of the carcass ply and an outer reinforcing cord layer and measured on a line passing through the upper end of the turn up portion of the carcass ply and perpendicular to the carcass ply and D is a thickness of that portion of the bead which is measured on said line. A rubber having a modulus of elasticity of 20 to 100 Kg/cm.sup.2 at 100% elongation is inserted into said space. 
Bridgestone Tire Company Limited
Y B B Y Y Y
Y10T B60C B60C Y10T Y10T Y10T
additional inventional inventional additional additional additional
Toshiyuki Hidenori Shigeo Hiroshi
Sogi Takahashi Watanabe Tamura