This SD Spinning bottom bracket is CNC machined from Aluminium. It allows the installation of a crankset with a 24mm axle on a frame with an external width of 68mm and an internal diameter of 42mm.

This bottom bracket has the special feature of working with bearings that have a conical outer cage. The installation of the bearings in the cups can therefore only be done in one direction. The cups also have an "OUT" side to indicate the outer side. This technology allows for automatic coaxial alignment to improve power output. Its easy maintenance functionality ensures it can operate smoothly for long periods, while the angular contact further enhances its reliability and longevity.

For the installation of the bottom bracket, it features an internal 20-spline imprint on each side to insert a key for a "square axle" type bottom bracket. This locking mechanism allows for easy installation. Its threaded structure helps limit the intrusion of foreign bodies and increases the rigidity of the bottom bracket.