The Bafang BBS01B/BBS02B mid - axle assembly comes with a large steel reduction gear. It's an 8fun mid - crank motor kit with a steel reduction gear set, perfect for replacement. The gear set includes a magnet disc held by a circlip, and a 68mm axle is also provided. When replacing the clutch, it's advisable to apply some grease.

Using the Bafang BBS01B/02B drive train is straightforward. First, make sure to place the axle in the right position. When installing the gear set, be careful with the magnet disc held by the circlip. When it's time to replace the clutch, remember to coat some grease on it. This helps with smooth operation. For maintenance, check the gear set regularly for any signs of wear. If you notice any unusual noises or reduced performance, it might be time to inspect the parts more closely. Keep the drive train clean and store it in a dry place when not in use.