WINTER TIRE Russian patent published in 2013 - IPC B60C11/16 B60C11/00 

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Tread 14 comprises surface rubber layer 21 with Shore A scale hardness of 50-56 and inner layer 22 with Shore A scale hardness 2 units higher than that of layer 21. surface layer 21 is thicker at central zone 10A than at tread shoulder 10B. Shoulder inner layer thickness exceeds that of treat central part inner layer. Studs are fitted only in tread shoulder zones so that stud end extends outward from surface layer surface while its opposite end penetrates inside inner layer.

EFFECT: better grip at snow.

3 cl, 3 dwg, 1 tbl