[header] How to get the bearings out of skateboard wheels [title] Unscrew the nut that holds the wheel on the axle. [step] Use the socket on your skateboard tool to remove the nut on the end of the axle. If you don't have a skateboard tool, or it doesn't have a socket, use a crescent or socket wrench. 
Wheel nuts are usually ½ " (13 mm), so use that size. [substeps] Take the nuts off of all four wheels at once if you are changing all of the bearings.