Also known as: bb.
BB has various meanings in the Bracket category. Discover the full forms, definitions, and usage contexts of BB in Bracket.
The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It is not a bracket as such. It contains a spindle that the crankset attaches to, and the bearings that allow the spindle and cranks to rotate.
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