Sunday’s race served as the debut of NASCAR’s new aero rules this season for road courses and a majority of tracks measuring 1.058-mile or less in distance, including Phoenix.<br>The rules package, which was tested in the offseason at Phoenix, consists of a 2-inch spoiler and the removal of three diffuser strakes and engine panel strakes. The changes led to approximately 30-percent reduction ...<a class='more' href='https://www.motorsport.com/nascar-cup/news/byron-work-to-do-short-track-aero-package/10443241/?utm_source=RSS&utm_medium=referral&utm_campaign=R SS-NASCAR&utm_term=News&utm_content=www'>Keep reading</a>

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