Sughrue, Mion, Zinn, Macpeak & Seas
Radial tire for heavy load vehicles
 A giant radial tire for off-road vehicles which is obliged to be used under heavy load and which is provided with a highly durable bead portion construction in which that end of the wire cords of the turn-up portion or reinforcing layer which is located below the maximum width position of the tire and disposed outside the bead core is arranged at the position which is higher than the height h of the rim flange of a bead portion mounting rim but lower than the height which is three times higher than the above height h, and the outer coating rubber of the bead portion has a thickness distribution satisfying the following condition given by EQU 0.30.ltoreq.(B.multidot.C/A.sup.2).times.(RW/SW).ltoreq.0.55 where PA0 RW is a width between bead legs of the tire mounted on the rim, PA0 SW is a maximum width between side portions of the tire mounted on the rim, PA0 A is a bead portion reference width, PA0 B is a minimum thickness of the rubber at the bead portion, and PA0 C is a maximum thickness of the rubber at the bead portion. 
Bridgestone Tire Co., Ltd.
B Y B
B60C Y10T B60C
inventional additional additional
Yasuo Akira
Suzuki Tamura