Elastomer composition and tire

A tire comprising a temperature-responsive component comprising an elastomer composition comprising:

• an elastomer component comprising a styrene-based elastomer;
• and
• a temperature-responsive resin that changes its hydrophilicity with changes in temperature,
• the elastomer composition satisfying the following relationship at two given temperatures differing by at least 10° C.:
• 0.5≤(Contact angle at lower temperature)/(Contact angle at higher temperature)≤0.90,
• the lower temperature being lower than 5° C.,
• the temperature-responsive component having a maximum thickness of 1 mm or more,
• the temperature-responsive resin is a block copolymer, and
• the amount of the temperature-responsive resin is 20 to 60 parts by mass per 100 parts by mass of the elastomer component,
• wherein the tire comprises at least one adjacent component that is adjacent to the temperature-responsive component and comprises a material different from the elastomer composition,
• a difference in hardness at 25° C. between the adjacent component and the temperature-responsive component is 2 or less, and
• wherein the temperature-responsive resin is a compound comprising “A” and “B” bound to each other,
• “A” comprises a polymer that changes its hydrophilicity with changes in temperature,
• “B” comprises at least one selected from the group consisting of terpene resins, rosin resins, C5 resins, C9 resins, C5/C9 resins, coumarone resins, indene resins, and olefin resins, and
• wherein the elastomer component has an SBR content of 70 mass % or less and a BR content of 30 mass % or more, each based on 100 mass % of the elastomer component.