I put a Perelli MT21 Rallycross on the back just before my last trip. Changed from an E07 that I got my bike with.
An amazing tyre. Very good grip and performance in all sorts of terrain. It throws rocks up the size of half bricks at the slightest twist of the throttle. It bites into sand, gravel, rocks whatever I put it through.
It is not going to see much more riding though, the knoblies aren't badly worn, but most of them show cracks at the base. I did ride hard, and this is probably just getting to grips with the bike's appetite for rubber.. It did about 2 000 km.