NASCAR has been testing an 18-inch alloy wheel combination on the Next Gen prototype for a few months now, and Monday series officials announced that the 2021 Cup Series cars would officially be running a center-locking single lug setup. This marks the end of an era in which NASCAR has been defined by 15" steel wheels with five individual lugs. The new setup made its on-track debut in the Next Gen car’s fourth on-track test Monday.
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