I have those...perfect tire for how I ride. I did a lot of reading up before I purchases a Side-X and discovered that if you divide the hours by the miles the average speed of those things is really really low, and that's why I got the P5. Then, I used the same base principal in my tire choice and went on Ebay and searched for 30" tires and wheel combos for the P5 and sorted by lowest price first....Boom, the Interforce was the perfect fit for my budget. I will tell you to get 2" wide spacers and get the $40 steel wheels from ITP, you will end up with the front tracking just a bit wider than the rear, but I look at that as a plus because I can see the front tires and watch as I go between obstacles and know that the rears will fit without drama. Now, you might be thinking that is not a big deal, but it is when you are already on an off camber turn going up a hill with one front tire about to lift off the ground (pucker factor),
If you keep the tires and rims skinny you get the advantage of ground clearance without the power loss. In fact, if you were to run really wide 27" tires you would get bogged down in the mud more because we lack the wheel speed to clean out the tread of mud build up on a traditional tire, but the R-Force has such big lugs its less of an issue. And they also do a great job at grabbing rock edges and tree roots while climbing up a hill.
Here are some recent pics.
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I just did a two day ride at Brimstone and this P5 never held up the group, not once. I only had trouble on one hill due to a large rock on one side, and I went around it on the trail right next to it, but then had to stop because the CanAm behind me ended up on it's roof due to that rock. I went everywhere the $30,000 RZR's and High lifters went...at a fraction of the price. Power steering, now that would be a bonus.
This is from last spring.
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I have videos of my latest trip.
Alex S