The rear sprockets of the cardan shaft should be properly in the grease. If there is too little fat on the rear sprockets, this will announce itself. The transmission becomes less smooth, you feel a vibration instead of the cardan running smoothly. This is the time to take action.
For greasing, use a grease that puts a nice film over the sprockets. Beixo recommends Shimano ball bearing grease or a similar product. The gray cover must be removed to lubricate the rear sprocket. This can be done by removing the two screws that hold the cover in place. Clean the side of the gear with an old cloth and then apply plenty of new grease. Turn the pedals for a few seconds to distribute the fat well and refit the dust cover.
No maintenance is required on the gears at the bottom bracket. After all, it is a closed system, so that no dirt or moisture enters the bottom bracket.
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