PNEUMATIC TIRE Russian patent published in 2011 - IPC B60C11/11 B60C11/12 B60C11/03 

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Two first main grooves running along tire circumference are made in tread central zone. Another two main grooves running along tire circumference are made on both outer sides of the first two main grooves. First raised groves and second raised grooves are arranged to alternate along tire circumference so that said first raised grooves run inward in lateral direction of the tires from the end of tread each shoulder zone to communicate with appropriate one of the first main grooves. Second raised groves and second raised grooves are arranged to alternate along tire circumference so that said first raised grooves run inward in lateral direction of the tires from the end of tread each shoulder zone not to communicate with appropriate one of the first main grooves. Tread central rib is made to run between said two first main grooves. Some blocks of shoulder zone are located between every second main groove and appropriate one end of shoulder zones, and some intermediate blocks of shoulder zone are located between second main groove and one adjacent first main groove. Intermediate blocks of shoulder zone incorporated long blocks running along tire circumference for distance equal to that of two intermediate blocks.

EFFECT: improved performances on ice-covered and wet roads.

9 cl, 5 dwg