Looks like some Mickey Thompson Sportsman pro's.

I think that's in Sweden or Denmark, I've seen that track in a bunch of vids on Youtube.

Many years ago I had tires that wide on a 67 Camaro. With a 14 X 10 inch wheel, they were called M-50's, 15 inch were called N-50's

Mine were produced by Kelly, if I remember right. Circa. 1979

Hope this helps.

Ty