Patent attributes
The purpose of the present invention is to provide a rubber composition for a base tread being excellent in fuel efficiency. In the rubber composition for a base tread, a dynamic elastic modulus E* (MPa) and a loss tangent tan δ which are measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following general formulae (1) to (3), and a strength at break TB (MPa) and an elongation at break EB (%) which are measured according to JIS K6251 satisfy the following general formulae (4) and (5).E*/tan δ≥25 General formula (1)2.0≤E*≤8.0 General formula (2)tan δ≤0.08 General formula (3)EB≥350 General formula (4)TB×EB≥8500 General formula (5)