PNEUMATIC TIRE Russian patent published in 2011 - IPC B60C11/04 B60C11/11 B60C11/12 

FIELD: transport.

SUBSTANCE: invention relates to air tire. Pneumatic tire tread T comprises at least three main grooves 1 and 2 running along tire periphery and multiple crosswise grooves 3 interconnected between main grooves to run across tire so that multiple blocks 5 are separated by main grooves 1, 2 and crosswise grooves 3. Central main groove 1, 2 located on tire equator E features liner shape. Crosswise grooves are arranged at 40° to 60° to direction along tire periphery. Ledge lower section s formed in crosswise grooves 3 in region connected with central main groove 1. Crosswise groove width varies with its depth. Crosswise groove depth at ledge base makes 40% to 60% of central main groove depth while minimum width of crosswise groove 3 varies from 30% to 50% of its maximum width.

EFFECT: higher stability on iced and dry road coat.

6 cl, 4 dwg