Dale Earnhardt Jr.'s Xfinity Series Challenger Reveals 'The Hardest Part' of Driving a Next Gen NASCAR

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Many NASCAR fans know there's a marked difference between body styles and engine power between a NASCAR Cup car and an Xfinity Series ride. JR Motorsports' Xfinity Series ace Justin Allgaier said there's also another marked difference between driving the two different types of cars: tires and tire wear.

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