bead base meaning in Chinese

• 胎圈底部

• bead:    n. 1.有孔小珠，玻璃球； 〔pl ...
• base:    adj. 1.贱的，劣的；卑下的，低 ...
• bead-to-bead measurement:    胎圈间尺寸

Examples

1. Test method of resisting high temperature for bead base of aircraft tyre
   航空轮胎胎圈耐高温试验方法