Truvativ BMX to Threaded (BSA) BB Adapter.
Features
Adapts American/Pro BMX frames with a non-threaded 51.3mm (2.02") ID bottom bracket shell to accept English-threaded bottom bracket & crank applications
CNC machined aluminum with 3 steel connecting bolts to prevent independent rotation
Specifications
Adapts:American/Pro BMX bottom bracket shell
Accepts:68/73mm English-threaded (BSA)