bottom bracket

== English == === Etymology === 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. === Pronunciation === === Noun === bottom bracket (plural bottom brackets) (cycling) A bicycle part that connects the crankset (chainset) to the frame and allows the crankset to rotate freely. Synonym: BB Holonyms: spindle, bearing ==== Translations ==== ==== See also ==== spindle === Further reading === bottom bracket on Wikipedia.Wikipedia