FIELD: tyre industry; tyres for heavy trucks. SUBSTANCE: consumable rib is provided at each side of tyre tread separated from main tread ribs by narrow edges groove of width not exceeding 1.5 mm. Width of surface of consumable rib is within 2.5-12% of tread width. outer surface of consumable rib is depressed relative to cross section of main ribs owing to radial step of 0.5 - 2.0 mm in size. To determine shape of consumable rib, form factor 0.10-0.50 is used. EFFECT: increased service life of tyre. 20 cl, 4 tbl, 17 dwg
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