These threaded multi-speed freewheels from SunRace are compatible with BionX Electric Bike Kits.
If your existing bike already has an ISO thread-on freewheel, you can use it with your BionX kit. If your bike has a 7-, 8-, 9-, or 10-speed hub, purchase one of these freewheels appropriate for your bike.
BionX S 350 DL Electric Bike Conversion Kit
BionX Axle Collar Puller Tool
Bionx Motor/Communication Cable Extension