I ran the Dune Stars on my only trip to Glamis, so I don't have any basis for comparison to robbing power etc. I would just say that they do provide more bite than I anticipated. I took the 4 of us just about anywhere I wanted. The one thing I noticed though, was that being mounted on 7" wide wheels makes for a narrow footprint. Apparently, 9" wide wheels would be ideal, but they would be custom order from someone like Douglas. So, anytime tracking down fluff on the backsides - the rig would really plow. You would almost have to gas down some stuff. The one advantage to the itp dune star set up I see is cost. There are better set ups out there, some guys are running sand tires unlimited on rear and shaving treads off of like terra crosses, but depends on how much time and money you have to throw at it. Some guys just air down!
I have the dune stars on my rzr. They work well, but I never ran the stockers in the sand. I just came back from sand mtn nv. I ran 2.5 psi in them and could make it up the main hill, in and out the the bowl in 2wd too. I do wish they were wider, so they would float more.
i just spent all weekend on 4, they are a little better than the stockers, for climbing but you can turn harder in awd on the stockers in the sand trails.. my buddy was running mudlites with the rears reversed and he could get around better than i could he also could run in 2wd where i was in 4wd. at first i tried with them just on the rear and they pushed the front really bad.. i hated it with 2 but 4 was better.
if i knew then what i know now, i would have saved the 500 bux and left it on the stockers. but i have them and i'm gonna use them.
they do look cool
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