| 摘要 |
forming a rubber composition for a crown portion(1) with a mixture of 20-40 parts by weight of butadiene copolymer rubber and 100 parts by weight of natural rubber with the N2Sa value of 100-150 m2/g and the DBP value of 100-170 ml/100g, and forming a rubber composition for a shoulder portion(2) with a mixture of 20-40 parts by weight of butadiene copolymer rubber and 100 parts by weight of natural rubber with the N2Sa value of 60-160 m2/g and the DBP value of 70-130 ml/100g.
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