| 摘要 |
PURPOSE:To equalize wear of left and right shoulder portions to prevent partial wear for improvement of durability by respectively specifying loss modulus of elasticity and loss compliance of each of rubber which forms one shoulder area and the remainder area in a tread portion. CONSTITUTION:A tread portion 5 is formed by one shoulder area S from a particular boundary point P to one outer edge Q1 and the remainder area O from the boundary point P to the other outer edge Q2 via an equatorial line C of a tire. The shoulder area S is made of rubber which is set respectively within the limits of 6 - 15kg/cm of loss modulus of elasticity, and also within the limits of 3.5X10<-3> - 6X10<-3>cm/kg<2> of loss-compliance, under conditions that initial strain is 10% dynamic strain is 2%, frequency is 10Hz and a measuring temperature is 60 deg.C. The remainder area O is made of rubber which is set respectively within the limits of 1 - 10kg/cm of loss modulus of elasticity and also within the limits of 1X10<-3> - 5X10<-3>cm/kg<2> of loss compliance. |
