| 摘要 |
PURPOSE: To improve control stability and high speed running stability of a motorcycle in its simple construction by setting loss/hardness ratio of tread rubber of a front wheel tire to that of a rear wheel tire to specific values and setting respective loss/hardness ratios of tread rubber and side wall rubber larger than that of the front wheel tire. CONSTITUTION: A loss/hardness ratio tanδ/Hs of a loss factor tanδ/to JISA hardness Hs (deg.) at 70 deg.C of the tread rubber 10A of a front wheel tire A is set from 2.0×10<-3> to 6.5×10<-3> . And also the loss/hardness ratio of the tread rubber of a rear wheel tire is set in the same way as the case of the front wheel tire A. And also respective loss/hardness ratio tanδ/Hs of the tread rubber and side wall rubber of the rear wheel tire are made larger than the loss/ hardness ratio tanδ/Hs of the rear wheel tire are made larger than the loss/ hardness ratio tanδ/Hs of the tread rubber of the front wheel tire A and side wall rubber 20A. As a result, a property of following road surface and riding comfortableness can be enhanced and generation of vibration may suppressed. And a handle angle is more automatically controlled in straight advancing direction as the ratio tanδ/Hs is smaller and control stability in turning and straight running is improved as the ratio tanδ/Hs is larger.
|
