We had a guy in our group get a set of these "dual side lug" vamps for his 600 Grizz last week.
Gotta say I was impressed, even though they're 26's - they did well this weekend in Doles.
I think they were suppose to be some kind of military contract for their smaller equipment. I say this because the tire is not "A" typical. The sidewall is incredibly thick. Infact, after putting them on the rim, we let all the air out of them with the valve core out and you could not tell they were not inflated even when riding them. Kinda heavy for the size, but for 70 bucks, they were hard to beat.
DSX-05 DUAL SIDE LUG VAMPIRE 26X9.50-12