自行車中的中軸(英語:Bottom bracket,簡稱:BB),是連接牙盤和車架的自行車組件,包含主軸軸承,以便連接曲柄的踏板能自由踩踏。中軸嵌套於車架的五通內,連接車架下管、座管及平叉。

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陶瓷中軸

參考文獻

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