Sughrue, Rothwell, Mion, Zinn and Macpeak
Tread reinforcing construction of pneumatic radial tire for heavy-load vehicles
 A tread reinforcing construction of a pneumatic radial tire for heavy-load vehicles is disclosed. The tread reinforcing construction comprises a combination of a rubberized belt superimposed about a rubberized carcass ply and at least one additional rubberized reinforcing layer interposed between the belt and a tread rubber. The additional rubberized reinforcing layer is composed of a reinforcing element embedded therein and formed of a helically formed filament or a bundle of at least two helically formed filaments assembled together without twisting at random. 
Bridgestone Tire Co., Ltd.
B B Y Y
B60C B60C Y10T Y10T
inventional inventional additional additional
Toshiro Masaru Yasuo
Tezuka Abe Suzuki