Why Knaus told Johnson to wreck No. 48

The inspection process at the race track only controls the position of the body relative to itself. The position of the body relative to the chassis is only measured at the NASCAR R&D Center.

The rear bumper of speedway cars get beat down from bump drafting, but so does the rear sub-frame. If the rear sub-frame and bumper do not deflect the same amount, then NASCAR will know that something is wrong.

This is why Chad Knaus instructed Jimmie Johnson to wreck the back of his car at Talladega according to AR1.com sources.

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