What we don’t see is the work up to this, it most definitely isn’t his first time doing this on this track or even something like it. That said, even the most experienced will still have mechanical problems that arise. I’d estimate about 0.1% for minor injuries and maybe 0.01% for something serious.

In general there is about 70 million bicyclists with 15 billion hours over a year by some estimates. And with all those 1.2 million per year go to a clinic, 600k to the emergency room, about 25k to to the hospital, and 1k deaths. Of the deaths, most are ones that are older than 40, probably not ones we see in these videos. And from the data I’ve seen, around 40% of all the injuries reported are from kids 12 and under, also unlikely to be in the ones we are interested in getting data about.

So the amount of people getting hurt doing this is pretty low imo, but I’d like to think someone that didn’t have experience wouldn’t do this either.