Determine if your skateboard is showing signs of wheel bite by looking at the area of the board under the wheels. If you see signs of burning or rubbed spots on the board directly under where the wheels, you are experiencing wheel bite.
Flip the board over on its top, truck-side up so you can jiggle the trucks to see how loose they are. If they are loose, you'll need to turn each of the nuts clockwise slightly with a wrench or skate T-tool until the trucks no longer jiggle. If the nuts are too worn to tighten down, install new nuts.
Install new bushings in your trucks if you can't keep them tight enough. The bushing is a hard rubber piece that fits up through the bolt hole in the truck onto which the nut tightens down. A new, harder bushing will be more resistant to bending, so your trucks are less likely to allow your wheels to bite the board.
Rotate and flip your wheels regularly to keep the wear on the wheels uniform. Wheels left in the same position all the time can wear down depending on how you skate your board so that your wheels will be different sizes. This prevents your board from giving you an even ride and can cause unnecessary wear and tear on your board, including wheel bite.