Includes:
Harmony adapter 547002
Secret adapter 505241

Application:
Mount a motorized sprocket with a disc brake rotor onto a threaded hub
The secret adapter fits standard threaded hub diameter 1.375" x 24 tpi - example
Or use with our flip flop wheels or hubs

Important instructions (warning): 
For threaded hubs use the Secret Adapter 505241 which screws inside the harmony adapter 547002 and onto the threaded hub. Use thread locking glue between the hub and adapter and all other screws including the 6 holding a rotor, and the 6 holding the motorized sprocket.  Be sure to use Loctite Threadlocker Red 271 High Strength