bottom bracket

短语

发音

US

词形变化

bottom brackets 复数 bottom brackets

别名

BB

释义与例句

n.
  1. 1.

    A bicycle part that connects the crankset (chainset) to the frame and allows the crankset to rotate freely.

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词源

From earlier bicycle designs, when it was a separate piece bolted onto the bottom of the frame. In modern designs the bottom bracket shell (or housing) is an integral part of the frame.

来源：wiktionary