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The disc keeps mud from filling the wheel and adding extra weight. It also keeps the valve stem from being damaged when the other cars are not playing nice. A drawback is that it makes checking tire pressure a bit more time consuming.
Managing Racecar Tires - Tire Watch

The disc keeps mud from filling the wheel and adding extra weight. It also keeps the valve stem from being damaged when the other cars are not playing nice. A drawback is that it makes checking tire pressure a bit more time consuming.  View Related Article