| 摘要 |
This invention relates to a rubber composition for a side rubber having a good processability and a reduced hysteresis loss and not deteriorating a durability of a side rubber, and more particularly to a rubber composition for a side rubber characterized by comprising 35 to 55 parts by mass of a filler at least containing carbon black having a grade of not lower than FEF based on 100 parts by mass of a rubber component composed of at least one of natural rubber and synthetic polyisoprene rubber, and another synthetic diene-based rubber, wherein an amount of the compounded carbon black having a grade of not lower than FEF is 15 to 55 parts by mass, and tan δ at 25° C. and a total amount of the filler compounded satisfy a relation of the following formula (I): tan δ/Total amount of filler compounded≦̸0.0025   (I).
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