I have an '09 RZR-S and I used to run 25-8-12 ITP mudlites shaved into mohawks up front on stock S wheels and 25-10-12 7 scoop extreme haulers on the rear on stock S wheels and didnt like them at all. I couldnt even dune in 2wd, the rear would just sink. I talked to the guy at Fullerton Sand Sports and he sold me on a set of 26-12-12 8 scoop extreme haulers on my stock S wheels and for now I am running the stock front wheels and maxxis tires, and it is WAY BETTER!!! I dune in 2wd all day even with a passenger. I chose the 8 scoop over 7 for stability in the corners, carving bowls, and the S also has more power and different gearing than a standard RZR so running 8 scoop is fine. I want to get some 26-9-12 ITP dune star fronts that will give good steering and good forward traction as well and sell off my 25'' mohawks. Never did get why people run smoothies on the front of a 4wd vehicle, or any vehicle for that matter. Doesnt it kill your steering? And also you are hurting the 4wd ability if you need to use it, right?