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On the superspeedway car, race teams often will use thinner rotors to lessen the rotating mass. Even the wheel-bearing grease is sometimes substituted with oil to help reduce friction.
Superspeedway Setups

On the superspeedway car, race teams often will use thinner rotors to lessen the rotating mass. Even the wheel-bearing grease is sometimes substituted with oil to help reduce friction.  View Related Article