所述末级支架上设置安装装置，用于安装备胎。
A mounting device is arranged on the last-stage bracket and used for mounting a spare tire.
采用多支架铰接的形式，易实现备胎架的折叠；
The spare tire holder is easy to be folded up by means of multi-bracket hinged connection.
采用多支架铰接的形式，易实现备胎架的折叠；
The spare tire holder is easy to be folded up by means of multi-bracket hinged connection.
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