Officials with NASCAR have announced plans to debut new aerodynamic rules designed to enhance NASCAR Cup Series racing at short ovals and road courses.

The new rules will help reduce downforce by up to 30%, according to NASCAR’s Dr. Eric Jacuzzi, who said the downforce levels are reminiscent of those in the mid-1990s. 

The main change will be the move to a two-inch rear spoiler (reduced from the current four-inch) and under-car tweaks, like the removal of three diffuser strakes and engine panel strakes and a trimmed diffuser outer fencing. 

All road courses, and most short tracks, will utilize the new rules in 2023. This includes Charlotte Roval, Chicago Street Course, Circuit of The Americas, Indianapolis Motor Speedway Road Course, Martinsville, New Hampshire, North Wilkesboro, Phoenix, Richmond, Sonoma, and Watkins Glen.

The new rules package will debut on Sunday, March 12, during the United Rentals Work United 500 at Phoenix Raceway. 

For the complete details, visit the NASCAR announcement here.