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The bottom bracket houses the bottom bracket spindle. The crankset along with chainrings are attached to the bottom bracket spindle.

Most modern cranksets feature an integrated bottom bracket spindle, replacing older bottom bracket systems with square or splined interfaces.

When choosing a bottom bracket for these systems, it's important to pay attention to the quality of the manufacturing. Renowned manufacturers known for their quality bottom brackets include Shimano, Campagnolo, and tune.

There are several different designs of bottom brackets. They differ, for example, in thread pitch (BSA and ITA), while newer frames often require pressed-in bearing cups.

It should also be noted that special tools specifically designed for bottom bracket removal are necessary. Links to the required or recommended tools can be found in the product descriptions.