tire pressure question again. sorry

I have 20" wheels with 35" ridge grapplers and want to know what the correct tire pressure should be ? The tire shop seems to think whatever is inside the door is what it should be but thats not what im running because it doesn't make sense!

Thanks in advance!

 

I put 40 psi in my 35"s and call it done. And air down when Offroad.

 

use this to get you in the ballpark, then adjust up or down a pound or two based on how you ride, payload, etc.

 

The door sticker can suck my balls. I adjust tire pressure according to wear, driving habits and what I’m hauling. That goes up if you jump up to an E rated tire. I’m running my E rated tires have about 44-46 psi in the front and 36-38 psi in the back. That’s unloaded. I like a lot of feedback through the steering wheel. So far my 275/70-18s are wearing very evenly with rotation every 5000 miles. Minimal feathering on the outside front tires. I also go by tire bulge front to rear, so that I have a similar contact patch with decent traction for the rear wheels. You could also try it chalk test to get you in the ballpark as well as the link above.

I feel that every tire and person is a little different on their preference. I started at 40 and slowly made adjustments until I was happy.

 

The calculator says to run my 35s at 25

 

I air down my tires to 25psi when offroad rocky terrain and 20psi in sand.