| 摘要 |
PURPOSE:To improve the responsiveness at cornering, by setting to specific ranges rubber dynamic modulus of elasticity and loss tangents of a cap tread portion and a base tread portion both forming a tread portion of a tire. CONSTITUTION:A tire tread is formed from two layers of a cap tread portion and a base tread portion. The cap tread portion has a rubber dynamic modulus of elasticity E' of 40-125 kg/cm<2> and a loss tangent tandelta of 1-0.6. The base tread portion has a rubber dynamic modulus of elasticity E' of 80-125 kg/cm<2> and a loss tangent tandelta of 0.29-0.45. As a result, the responsiveness at cornering, the controllability in a critical case, etc. may be improved.
|
