RUBBER COMPOSITION AND TIRE

The present disclosure provides a rubber composition and a tire which provide improved overall performance in terms of wet performance and dry performance. The present disclosure relates to a rubber composition, containing at least one polybutadiene rubber and/or at least one styrene-butadiene rubber, having a complex modulus E* that reversibly changes with water, and satisfying the following relationships 1) to 3): 1) Complex modulus E* when water-wet/Complex modulus E* before water-wet × 100 ≤ 98 wherein E* represents the E* at 23°C of the rubber composition; 2) 99 ≤ Complex modulus E* after water-wet and dehydrated/Complex modulus E* before water-wet × 100 ≤ 100 wherein E* represents the E* at 23°C of the rubber composition; 3) 99 ≤ Volume when water-wet/Volume before water-wet × 100 ≤ 100 wherein Volume represents the volume at 23°C of the rubber composition.