Metzeler Unicross
 

It looks like a good choice for XTR going off road, i saw that they come as 140/17 on rear tyre so i wonder are they any good? All good off road tyres doesn't even come in 17 inches so this looks promising.
So far i tried some tourances which are great for road usage but terrible on terrain exept gravel, mitas e 09 is cheap and good copy of michelin t 63 and they work on terrain but with weight of xtr isn't happiest solution.

Pirelli bought out Metezler..and it is basically the same as MT16