Over the past few years NASCAR required the teams from all three of its racing series to start the race on the same set of tires in which they made their qualifying run. Any team who made a tire change between the end of qualifying and the start of the race were required to start the race at the back of the field.
On May 16 NASCAR made a rule change that will no longer require teams to start the race on the same set of tires used in making a qualifying run for teams in the Monster Energy Cup Series.
The new tire rule will take effect beginning May 27 with the Coca-Cola 600 at Charlotte Motor Speedway.
With the new tire rule, the teams will e given four sets of tires for practicing and qualifying. The exception will be for Super speedways where the teams will only receive three sets of tires. For enhanced race weekends and super speedway races the teams will be allowed to carry over their qualifying set of tires.
In the event a team does not use a new set of tires for qualifying, they may bring over a set of scuffed tires for enhanced weekend and super speedway races.
The change gives teams one less set of tires for practicing but adds a set of tires for the race itself.