nitto trail grappler 285 75 r17 E rated with rev saverge 17x8.5

so what psi should i go?

 

Start with whatever the doorframe sticker says your psi should be. If you're not happy with the way it feels/the way they're wearing, then adjust accordingly. I have 285/70/17 on a 2012 JKUR - The door sticker says 37psi for the stock tires, my replacements like 35psi better.

 

I would start at 30 psi. More than likely you will end up lower than that. I'm running mine at 28