this should really be on the Wheel's and tires section. but It's really going to depend on the tire you change to. Each tire rides differently and each machine/rider combo requires a different preasure to match the riders preferences.
We run the 26" Mud Lite XL's on a Polaris 570 Razor and a Polaris Big Boss 6x6 and 28" Mud Lite's on a 800 Ranger. They are rougher riding on hard pack then OEM tires. They also start smoothing out at around 5 mph and do well at 10 mph. Air pressure is between factory specs and what works best for you.
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