You may have noticed the small weights placed on the rim of your tire. These weights help the tire and wheel assembly remain balanced at all speeds. At high speeds a tire that is not balanced properly can generate severe vibrations. An unbalanced tire and wheel can also lead to irregular treadwear.
Some expensive alloy wheels can be damaged with the use of standard lead weights and may require the use of a coated weight. See your Nitto dealer for more information.