| 摘要 |
PURPOSE:To enable long-distance run even when tire is punctured by forming a tire composite body on the inner face of a side wall section, regulating rubber composition of a side wall reinforced layer, and regulating thickness of tire composite body and radius of curvature of a carcass. CONSTITUTION:A side wall reinforced layer 10 is provided on the inner face of a side wall section 4, and it constitutes a tire composite body 12 together with a tire proper 11. At this time, the side wall reinforced layer 10 is formed by the rubber component in which carbon black of 40 to 60 weight parts and sulphur of 3 to 8 weight parts are blended for a mixture of 100 weight parts which is composed of polybutadiene polymer of 50 to 80 weight parts and rubber of 20 to 50 weight parts. The ratio of thickness x (mm) of the tire composite body 12 to height H of cross section of tire, x/H, is above 0.18 and below 0.34. Further, specific thickness distribution index beta is set to above 300 and below 450. Radius of curvature, R, of inner face of a carcass 6 is above 33mm and below 50mm. |
