| abstract |
(57) [Problem] To provide a tire with improved DRY performance without deteriorating WET performance. SOLUTION: A rubber composition having a tread portion, the rubber composition constituting the tread portion, a rubber component, a short fiber having an average length of 10 mm or less, and a lactam having a heterocyclic ring having 4 to 19 carbon atoms, Tertiary amines, isoquinolines, cyclic dipeptides, A tire comprising a mixture of at least one nitrogen-containing compound selected from imidazoles and imidazolines (dihydroimidazoles). |