Hold the wheel in your hand, face up, with a finger covering the hub on the backside. Fill the bore with graphite. Take an axle, and start pushing it into the bore (as though you were about to mount it). In a quick motion, push the axle through and turn the wheel over so the wheel is now resting on the head of the axle. Spin. Add more graphite. Spin. Insert the axles into the car, add more graphite. Spin. Ad infinitum.
At this point, your wheels should be able to spin for at least 20 seconds.
Then sit back and marvel at the mess that graphite has created. (You can clean graphite off a shiny paint job using WD40 or olive oil)