{TAIL ~ The 100% modulus} of {HEAD ~ the side packing rubber} is smaller than that of the bead apex rubber and larger than that of the side wall rubber, so that the shearing stress is decreased so as to enhance the bead part durability while enhancing the rigidity 
{ TAIL ~ The 100 % modulus } of { HEAD ~ the side packing rubber } is smaller than that of the bead apex rubber and larger than that of the side wall rubber , so that the shearing stress is decreased so as to enhance the bead part durability while enhancing the rigidity
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