For a precise and smooth action around your crank-arms get the Substance by BSD
The Substance is a Mid Bottom bracket, complete with sealed precision bearings, CNC'd spacers, tube spacers, a sprocket bolt and all other spacers needed for perfect alignment.
Before buying a bottom bracket, you have to check what type your frame is compatible with. If it doesn't have integrated cups, an American bottom bracket would fit, but if your frame does have integrated cups, the bearings will not fit in the sockets.
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