Based upon the fact that the Bristol Motor Speedway is not gaining tire rubber on the surface during NASCAR Nationwide and Sprint Cup Series practices, NASCAR will switch the tire compound for the teams this weekend. The tires will arrive later Friday night, so the Sprint Cup Series teams will qualify on the old tires and will practice on the new ones in practice on Saturday. The Nationwide Series will run the old tires in qualifying and the start of the race and will switch the tires on a competition caution during the race.
The move comes after the tires were laying down a powdery substance.
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