Fits Standard english Threaded frames which you can now fit BB30 cranks to .....
With ceramic bearings
Ideally for the new rotor 3d+ cranks
Use this BSA Threaded BB to convert any BSA treaded bottom bracket to accept a BB30 Crank.(3D+)
This 30mm External BSA bearing is the option you need to fit so you can use BB30 cranks in your standard Threaded Frame.