Using this rear wheel hub is quite straightforward. First, make sure your axle is 30mm in size as this hub is designed for it. Carefully align the 8mm wide keyway with the corresponding part on the axle. Then, use the included 8mm wheel studs to secure the hub in place. When installing, be gentle to avoid any damage to the hub or the studs. As for maintenance, regularly check the tightness of the wheel studs. If you notice any signs of wear or looseness, replace the studs right away. Keep the hub clean from dirt and debris to ensure smooth operation. And remember, these hubs are sold individually, so if you need more than one, make sure to order the correct quantity.