FOX: NASCAR on X: Restrictor plate vs. tapered spacer. What's the difference? Chad Knaus and @ReganSmith explain. / X

From the vault: Chad Knaus changing No. 24 tires during 'Rainbow Warriors' pit practice - NASCAR EN ESPANOL

Why does NASCAR have restrictor plate rules at some tracks? Isn't this actually more dangerous, since all the cars run in packs? - Quora

FOX: NASCAR on X: Restrictor plate vs. tapered spacer. What's the difference? Chad Knaus and @ReganSmith explain. / X

The 2019 Rules Package: The Tapered Spacer : Building Speed

Chad Knaus and Regan Smith explain the difference between a restrictor plate and tapered spacer, Restrictor plate vs. tapered spacer. What's the difference? Chad Knaus and Regan Smith explain.

Is the Tapered Spacer Rule Fair? : Building Speed

FOX: NASCAR on X: Restrictor plate vs. tapered spacer. What's the difference? Chad Knaus and @ReganSmith explain. / X

NASCAR Won't Run Restrictor Plates At Talladega For The, 58% OFF

The 2019 Rules Package: The Tapered Spacer : Building Speed

The 2019 Rules Package: The Tapered Spacer : Building Speed

From the vault: Chad Knaus changing No. 24 tires during 'Rainbow Warriors' pit practice - NASCAR EN ESPANOL

NASCAR Won't Run Restrictor Plates At Talladega For The, 58% OFF

The 2019 Rules Package: The Tapered Spacer : Building Speed