John Probst, NASCAR Senior Vice President of Innovation and Racing Development, said the move away from a 15-inch steel wheel was part of an overall goal to provide more relevance and a stronger correlation to today’s production cars with an 18-inch wheel, but that a strong enough fastener that could hold up under high-speed conditions was a necessity. The three previous tests featured a larger aluminum wheel, but with the five-lug pattern that’s been used in NASCAR for decades. The setup made its debut in the Next Gen prototype’s fourth on-track test, scheduled Monday and Tuesday at Auto Club Speedway. NASCAR officials announced Monday that the Next Gen car for the 2021 Cup Series will have a single, center-locking lug nut for its wheels.
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