Definitely the biggest safety feature in that tire. They have to keep them underinflated so the tire is incredibly stretchy allowing the car to get immense grip and road contact. If those were completely full and stout, it would be disasterous if the car started bumping. And one bad bump could make the car very unstable and possibly send it rocketing toward the crowd.
There not under inflated, instead they have two crumble walls that are made for better breaking acceleration and it allows them to grow in diameter when moving
It's not a bad tire all it is that they deflated the tires so they get a better hookup so the tire don't spin and lose control that's all you just don't know what your talking about.
You can see that the tire jumped causing a lack of traction and if you look in the distance the car in lane 2 the wheelie bar is almost in aligned with the car in lane 1. That is crazy what a fraction of a second from a wheel spin can cause you!
Cleetus mcfarland had that happening on the supra a few weeks ago from memory, jackstand marked the tyre and rim, and after each pass the line was further around, to the point it was about 1/4 turn on the rim by the end of the video
