A Wednesday bulletin sent to Monster Energy NASCAR Cup Series teams outlined rule changes for the season’s three remaining restrictor-plate races.
The rear spoiler will be increased to 9 inches (from 8), and NASCAR officials have also mandated a 1-inch bolt on track bar mount to change the height to 12 inches. With the latter change, it will raise the rear of the car, which teams were running as low as possible since NASCAR eliminated the minimum ride height rule at the superspeedways before the start of the 2018 season:
These changes are to bring speeds back down to a safe range after a two-day February test at Daytona produced speeds higher than what NASCAR wanted with the new rules package. Daniel Hemric, Kyle Larson, and Alex Bowman participated in the test.
Officials do not expect the style of racing to change at Daytona (which the series visits again in July) or the two Talladega races (in April and October).