Tire pressure question

I have 285/70/17 BFG KO2s. Just swapped out an identical set for some new ones. The old ones were at about 32 PSI. The shop that installed the new ones put them at 41 PSI. They definitely seem to roll smoother, but some (or all) of that is due to new tires I assume. My truck is stock with a Leer topper, Bilstein 5100s. What pressure do you guys run for street driving? I'm thinking somewhere in between 32-42? My old ones MAY have (not sure) had a little uneven wear on the outside.

TIA, Dan.

 

I run mine at 35lb, I had them at 40 and it rolled better...but I could feel everything in the road. Now she rides like a Cadillac. Nice and plush.
Ymmv, gonna need to play a little with it to find the sweet spot you like.

 

I would say 35.

 

4 wheel parts likes to have them at 40psi But when the Toyota Dealer put on the TRD Black Sema wheels they put them at 32psi I liked it at 40psi Got Better MPGs at 40 FYi

 

Ya really have to play with it if your sensitive too it and notice. I run 32 in winter and 35 in summer to baseline everything. Really depends on tires, weight of the truck, weight of payload.

 

35-37 seems to be the sweet spor for me. E loads need a bit more PSI, C Loads need a bit less.

 

Use this to convert Toyota’s recommended pressure for stock tires to your new LT tires: And adjust from there. IIRC to keep the same load carrying as stock you should be at 37 or 38 psi.

 

Thank you all! I will try the converter when I get home.

 

Thought i remember the dealer saying something about the tire air pressure sensors causing the warning gauge in the dash to go off if below or above the factory recommended air pressure.

 

I keep mine at 40 all the time. I know that it goes up and down and have never had a problem with the tpms light. It’s more like set it at 40 and forget it.

 

X2.

 

You have got LTs right?

 

I run mine at 31.415926535
They are rounder at that pressure and roll better.

 

You are out of your mind.

31.415926536 is waaay better.

 

I don't like to "round up".

Funny thing is I bet only 50% here grab on to this.

 

Well, you dont know what you are missing sir.

 

224.61016264268 kPa is also a good baseline pressure

 

You have that backwards. E rated requires less PSI to take the same load as a C rated. (Width of tire will also dictate PSI to load, Ie wider tire less PSI). It’s the load that the tire is taking that’s THE most important factor with PSI under normal / everyday driving conditions.
example, E rated at lest say 40psi will take the same load as C rated at 60psi. Each tire is different and the manufacturer will post that information (Also written on the sidewall), that should be your starting point for PSI, using that against the actual weight of vehicle, or you can use chalk trick or cold / warm temp, and even cold warm PSI change. Plenty of correct (take the guessing out) ways to do this.

 

I got the 265/70r16 111t toyo open country at3 on the truck.

 

Almost all of this is wrong. See the load chart below from TOYO:



https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdf

C Load and E load tires in the same size have the same load carrying up to the same pressure, but C load tires have a lower maximum pressure so e load can be inflated more and therefore carry more.

Air pressure is what carries the load, tire construction just contains that pressure. E load tires are more heavily constructed than C so they ride stiffer and are heavier.

To find the load-based tire pressure for whatever size you change to, start with your door sticker and either use the chart or the calculator I posted before.