| 摘要 |
PURPOSE: To provide a studless tyre for all seasons in the true sense having a sufficient brake property and driving property, not only on dry-on-ice but on wet-on-ice, after ensuring steering stability, durability and a low fuel consumption property sufficiently in summer. CONSTITUTION: A tread is provided with a foamed rubber whose hardness measured by ASTM shore D is 40 deg. or more and average grain diameter is 10-400μm and which contains a resin which can form a polymer alloy with a rubber or crosslink with the rubber by 5-30 weigh parts per 100 weight parts of a rubber component and whose foamed ratio is 5-30% and having a closed cell, the average grain diameter of whose resin is 0.5-5 times an average cell diameter and whose storage elasticity (E') at -20 deg.C is within the range of 6.0×10<7> to 20×10<7> dyn/cm<2> .
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