RUBBER COMPOSITION AND PNEUMATIC TIRE USING SAME

For wet tires for competition, a compound that can achieve high wet grip performance, period of time required to exhibit the grip performance, stiffness, durability, and wear resistance at high levels has been demanded. Furthermore, improvement in deterioration of processability due to blending of silica has been also demanded. Therefore, in the present invention, the problems described above are solved by a rubber composition containing at least: a diene rubber, a silica, a silane coupling agent having a mercapto group, a plasticizer, and an oil and/or a resin; from 50 to 200 parts by mass of the silica per 100 parts by mass of the diene rubber and from 2 to 20 mass% of the silane coupling agent having a mercapto group relative to the amount of the silica being blended; and a total amount of the plasticizer and the oil and/or the resin being 60 parts by mass or greater per 100 parts by mass of the diene rubber.