FIELD: tire industry.
SUBSTANCE: lateral periphery (P) of first head (110) of case (100) of a spike contains at least one deepened part (113). Lateral width (L) of deepened part (113) is from 5 to 10% of a circumference of lateral periphery (P) of first head (110). Depth (Dp) of deepened part (113) is from 15 to 50% of lateral width (L) of deepened part (113), and this is deepened part (113).
EFFECT: increase in the reliability of attachment of spikes in a tire and efficiency of grip on the road surface.
19 cl, 7 dwg, 1 tbl
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