| 摘要 |
PROBLEM TO BE SOLVED: To enable excellent performance to be exerted on ice and snow from the beginning to the end of driving. SOLUTION: This tire is provided with a pair of bead parts, a pair of side parts connecting from them and extending outward, a carcass layer extending in the toroidal state between both the bead parts for reinforcement, and a tread part over both the side parts, and the tread part is constituted by a cap layer on the ground side and a base layer adjacent to its inside. In this case, a rubber composition of the cap layer includes a softener of 0 to 15 weight parts to 100 weight parts of a rubber component, the rubber composition of the base layer includes a softener of 25 to 50 weight parts to 100 weight parts of the rubber component, and the difference of the softener content between the cap layer and the base layer is 25 to 50 weight parts, and a dynamic modulus of elasticity E' of the cap layer at -20 deg.C is 60×10<6> to 120×10<6> dyn/cm<2> .
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