Also known as: bb.
BB stands for various terms. Discover the full forms, meanings, and possible interpretations of BB across different fields and industries.
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.
BearingBracketStandardLast updated: