abstract |
(57) [Problem] To provide a rubber composition which simultaneously satisfies both low fuel consumption and sharp edge during extrusion processing, and balances both properties in a well-balanced manner. SOLUTION: High cis-high vinyl polybutadiene (a) A rubber component (a) + comprising 20 to 80% by weight and 80 to 20% by weight of a diene rubber other than (a) (b) (B) 100 parts by weight, and inorganic filler (c) 25 to 6 0 part by weight, wherein (1) the microstructure of (a) is cis-1,4 structure is 65 to 95% And (2) a 5% toluene solution viscosity (T-c at 25 ° C.) of (a). p) and Mooney viscosity (ML 1 + 4 ) satisfy the following formula (I): 2 ≦ T-cp / ML 1 + 4 ≦ 6. . . (I) and (3) a rubber composition for a side wall, wherein a vulcanized product of the rubber composition has a rebound resilience specified by JIS K6255 of 60% or more. |