端面

chē lún duān miàn bù píng shí zài xíng zǒu zhōng huì fā shēng zuǒ yòu yáo bǎi qíng kuàng

车轮端面不平时，在行走中会发生左右摇摆情况。

When the wheel end surface is uneven, side-to-side swing will occur during walking.