FSA 8420ST Bottom Bracket

This unit is designed for frames with an English threaded bottom bracket shell that is 73mm wide. Please verify your frame's shell width and threading standard before purchasing, as this is not compatible with press-fit or Italian threaded frames.

The 118mm spindle length is specific to certain splined cranksets. You must match this length exactly to your existing crankset to ensure proper chainline and shifting performance; using a different length will likely cause alignment issues.

The hollow forged chromoly spindle is engineered to strike a balance between weight savings and structural integrity. It provides the necessary stiffness for efficient power transfer while remaining durable enough for regular, everyday riding.

This bottom bracket uses 6002KRS industrial cartridge bearings, which are designed as a sealed unit. While they are highly durable and protected by double snap seals, they are generally replaced as a complete unit rather than serviced individually.

The unit features double snap seals specifically designed to keep water, grit, and dirt out of the bearing assembly. While it is built for reliable performance in varied riding conditions, regular maintenance and cleaning will help extend the life of the seals.