Most wheeled wheels you buy have already fitted a scooter bearing. However, if you want to change the scooter bearing, it is relatively simple on a plastic tire wheel, but it may be a more crazy pleasure on wheels with aluminum cores. We recommend watching a video on how to do this correctly before buying bearings for an aluminum wheeled scooter. If you buy bearings for a wheeled wheel that does not already have bearings, be sure to buy a "spacer", otherwise you may damage your bearings.
You can read more about bearings in this guide for scooter bearings.