This really determines what type of trails / terrain (Rock, Mud, Sand or Trails) you're riding on and personal preference. Ideally you want to test the PSI levels on the terrain your usually riding on and set it to what you KRX responds the best to.
Please note that if you and running with 8-12 PSI in a high speed turn you can rip the tire off of the wheel.
Some of the most common PSI settings from the KRX community shown below:
Desert Riding
- Front: 18 PSI
- Back: 22 PSI
Mud Riding
- Front: 8 PSI
- Back: 10 PSI
Rock Crawling
- Front: 8 PSI
- Back: 10 PSI
Here's some various PSI Tire Levels people in the KRX community have mentioned:
- Front: 12 PSI
- Back: 12PSI
- Front: 10-15 PSI
- Back: 10-15 PSI
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- Front: 13 PSI
- Back: 23 PSI