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Bicycle bottom brackets come in various types, including Taper square / hollow tech design,  threaded (with variations like BSA, Italian, and French), press-fit (PF30, BB30, BB86, BB92), and others like the T47.

Each type suits different frame designs and diameters, offering specific advantages in terms of weight, stiffness, and ease of maintenance.

The choice depends on compatibility with the bike frame and the rider’s performance needs.