| 摘要 |
PURPOSE:To prevent damage to the road surface by forming a part of a tyre, which touches the road surface, by using resin whose taper wear and rockwell hardness are as predetermined. CONSTITUTION:At least the part of a tyre, which touches the ground surface, is fabricated by using resin, whose taper wear for CS-17, 1,000g does not exceed 10mg/1,000 times and moreover whose rockwell hardness in R-scale, by ASTM 785 is 35 or higher, for example, polyethylene of super-high molecular weight, whose mean molecular weight is one million or more, nylon 66, polyacetal, or the like. With this constitution, both remarkable wear of a spike pin and decrease in spike effect can be restricted and damage to the road surface can be prevented. |
