Which PSI rating to go by

The yellow sticker on the door jam of my truck says 55 front, and 60 rear. That's what I use, towing or not.

I have LT245/75R17 LRE OEM tires.

Neither. Air tires up or down for the load they’ll see and do not go over the sidewall max or less than safe for popping a bead.
I’ll run 80 psi max tires anywhere from 20-80psi depending on what I’m doing with the vehicle at the time.

door jam number at the minimum. you may find a slightly higher pressure gives you better handling, usually at the expense of ride.

The Max pressure is the max the tire is rated for at it's max load. So unless your going to have that load on the tires, your likely over inflating.

downtheroad wrote:
The tires are what you put the air in, not the door jam....I go with what is stamped on the tires..

(are they the original tires or replacements?)

Please explain why???

ACZL wrote:
Okay, so now I'm confused. When airing up tires on trucks for towing, do ya go by the sidewall PSI or door data label? I always thought the door label was lower and yet sidewall says max "X" pounds at "X" PSI. :h

Each truck style/brand may show different on the door jam.

I see you are carrying a fairly large FW, so I'd go max tire pressure rear (likely 80 psi) if SRW. Since the front carries almost none of the pin wt, I'd stay with front tire door jam specs, to maybe plus 5 psi, depending how far forward of rear axle center your pin is at.

Jerry

The tire sidewall shows the max load the tire can carry at the specified PSI. The vehicle manufacturer calculates the required PSI to carry the GVWR of the vehicle, and indicates that on the door jamb sticker.

If you want to be sure, get the rig weighed and use the tire manufacturer's loading chart. Here's an example of such a chart for a Michelin titre;

Weight. The tire max psi is for max load. You need to know your max weight while towing hauling etc. and go from there. There are plenty of fire charts out there to help you figure it out. For me during the off season I run 60 front 55 rear. When towing it’s 60 front and 75 rear per my weights and tire rating with the 5er attached. All about weight.

The tires are what you put the air in, not the door jam....I go with what is stamped on the tires..

(are they the original tires or replacements?)