Assertion: radial tire's durability | /r/CapableOf | become insufficient
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Source sentences:
text: In a pneumatic tubeless radial tire having the bead portion 31 constructed as hereinabove described, the bead portion 31 is not reinforced satisfactory by the chafer plies because the cords of the chafer plies extend at an angle of 60° with respect to the radial direction R. Particularly, in the case that a heavy duty vehicle equipped with the tire having the bead portion 31 travels on a road under high load condition and the tread portion is repaired several times, the durability of the bead portion 31 becomes insufficient and consequently there has been the drawback that the bead portion 31 cracks from laterally inwardly to outwardly, as shown at 35, viz., from a radially uppermost end 34a of the carcass 34 to the chafer plies 36a, 36b and 36c.