RUBBER COMPOSITION, SIDE RUBBER, AND TIRE

With the aim of providing a rubber composition that is capable of increasing the ratio of sustainable materials in rubber products and improving elongation at break (EB) after thermal aging, a rubber composition contains a rubber component (A), recovered carbon black (B), a quinoline-based antioxidant (C), and zinc oxide (D), wherein a mass ratio "zinc oxide (D)/quinoline-based antioxidant (C)" of the zinc oxide (D) to the quinoline-based antioxidant (C) is more than 0 and not more than 1.8.