中轴

自行车中的中轴（英语：，简称：BB），是连接牙盘和车架的自行车组件，包含主轴和轴承，以便连接曲柄的踏板能自由踩踏。中轴嵌套于车架的五通内，连接车架下管、座管及平叉。

陶瓷中轴

参考文献

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