What tires would you use for this???

Do you mean the motorbike with the camera, or the riders?

The riders are using ordinary 23 mm race tyres.

What motorbike? It's a guy on a bicycle. You can see his shadow and hear his gears. Plus, you can see it when he stands up and pedals, the camera angle wobbles. Not sure what motorbike does that....
23's... yeah I know, but what kind? pressure, tread pattern if any, etc if any.

artemidorus said:

Do you mean the motorbike with the camera, or the riders?

The riders are using ordinary 23 mm race tyres.

svtpilot said:

What motorbike? It's a guy on a bicycle. You can see his shadow and hear his gears. Plus, you can see it when he stands up and pedals, the camera angle wobbles. Not sure what motorbike does that....
23's... yeah I know, but what kind? pressure, tread pattern if any, etc if any.

Perhaps I missed something, but this looks like a normal descent on a big mountain challenge event to me. Any good road tire should work fine; tread pattern doesn't matter. Race tires like Pro 3, 4000S or Open Corsa EVO might have a bit more grip than others, but don't believe thats too critical on dry pavement.

You probably know from your motorbike that overinflated tires hurt roadholding and stability on fast downhills. At 85kg, I like 100 psi in front, 110 rear.

I'm with dhk2: it's a normal descent. No special tires are required. In fact, the riders aren't even pushing any grip limits on the descent. You could do this with a Walmart roadbike, assuming said bike was stable at higher speeds and while cornering at higher speeds.

In general, slick tires are what work best on the road, wet or dry. Difference in grip between different tread compounds will only start to manifest near the hairy edge, and as I said, the riders in the video ain't near that edge.