Ball bearings used on most rotating parts on pro-level kits, bearings provide a way to eliminate almost all of the resistance that bushings have and serve to make the car quicker overall. For machine kits with the standard shielded bearings (metal shields on the side), just brush them off every now and then.

You may want to put a very light dab of oil and let it soak into the bearing, but for the most part just brushing the dirt off the bearing is fine. Now a days rubber sealed bearings are used more frequently, which require even less maintenance.

Bearings these days are being upgraded to rubber sealed bearings. Make sure they are clean on the outside. Wipe them free of any grease from the exhaust and 'road grime'. Check the bearings after each day of running.

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