The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains a spindle that the crankset attaches to, and the bearings that allow . With a one-piece (also called Ashtabula) crank and bottom bracket, the spindle and crank arms are a single piece. The bottom
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1. 3. BB-2K series has a keyway on both the inner and outer race. 4. Correct b t1. 2t. y r w e t q. Shaft q Inner race w Outer race e Cam cage r Ball bearing.