A.≤0.1MPA B.0.1~0.2MPA C.0.2~0.4MPA D.0.45~0.70MPA
A.比車輪材質硬 B.比車輪材質軟 C.和車輪材質一樣
A.0.2PA B.0.3PA C.0.45PA D.0.6PA