Sughrue, Mion, Zinn, Macpeak & Seas
High performance pneumatic radial tires with auxiliary belt layers
 A high performance pneumatic radial tire includes a tread with plural circumferential grooves, a radial carcass, a belt composed of two belt layers of metal cords, one additional reinforcing layer arranged on a radially outer side of the belt and on an axially central area of the tread, and at least two additional auxiliary layers arranged on each of widthwise opposite side portions of the tread and composed of organic fiber cords. The additional reinforcing layer is composed of cords crossing the metal cords in the belt layer adjacent thereto and inclined with respect to the tire-circumferential direction, and has a width smaller than a minimum width of the belt but greater than a distance between the circumferential grooves located on widthwise outermost sides of the tread, respectively. The organic fiber cords composing at least two additional auxiliary layers extend substantially in the tire-circumferential direction, and at least two additional auxiliary layers have different widths. 
Y Y B B Y B
Y10T Y10T B60C B60C Y10T B60C
additional additional inventional inventional additional additional
Shinichi
Watanabe