Tire Pressure

My mistake...2,326.
I use the same math and formulas the tire manufacturers are supposed to use.
When you talked to the manufacturers, did they ask about your OE tire's load rating and placard PSI?

 

No I called and said "what is the recommened PSI for a 2017 Toyota Tacoma Doublecab TRD Offroad for X tire." X tire being stock tire size but specific tire eg Michelein LTX A/T2, BFG KO2

They said that OEM psi for load of 2326 is 30 psi and their LT tire in that size is recommened for 50 psi to meet/exceed original load at 2335.

Thats pretty much word for word. They did have to do some conversion from the OEM passenger tire to an LT tire. The placard does say tire is P265/70R16. I think the biggest difference is that, running a P tire vs a LT tire.

Lowering psi will obviously lower the load rating.

 

They didn't do it right then.
My OE tires had a 112 load index, recommended PSI was 30.
This gives me a load requirement of 2,149 lbs. After metric to LT deration of 1.1, this gives me a load requirement of 1,954 lbs. What PSI I achieve this at depends on tire size; in my case 37 PSI with LT265-75-16.

 

I edited my comment before you reply so it may clarify.

Why would both manufacturers have the exact same information and exact same conversion?

Also why did your load requirement go down? While the tire manufacturers stated that when converting to LT they must meet or exceed? If you are at 2149 they would say you need to meet or exceed.

Are you sure you are supposed to divide by 1.1 instead of multiply? Multiplying makes is 2363 which is darn close to what they told me.

Also I found this, maybe someone else can make sense of it.

 

Amazing. Every E Rated tire I've run on 1/2 tons and smaller at 35 psi all wear dead flat until the tire is bald. Guess those 1000+ trucks must have been duds

 

It goes back to the Ford/Firestone debacle...
This should answer your questions...
https://www.toyotires.com/tires-101/tire-load-and-inflation-tables

 

Exactly. It's to cover their ass. Nothing else

 

Ya that all makes sense, and it sounds like thats the prcoess Michelin and BFG took.

In this reading, their example, they took a load rating of 2125 at 35psi on a P tire and when converting to LT they needed to meet or exceed that number with the LT tire which was 2255 at 45psi.

Page 11 for reference.

I guess the question is where did the 2326 number come from and is that before or after deration?

Toyo Example
2125 at 35psi - P
2255 at 45psi - LT

Michelin and BFG based on Tacoma
2326 at 30psi - P
2335 at 50psi - LT

 

you must hit your head alot driving with tires at those PSI. that has to be so harsh and bouncy
I once had a bad tire gauge and over inflated my tires to like 48lb. this was years ago in my 1st gen taco with BFG ATKO and my god i thought I was going to go through the roof everytime i hit a hole till i checked them again and saw the PSi they got inflated to

 

But but but, I called and they told me.

 

So you put a stronger heavy load rated tire on your truck and thought it would be the same as weaker more comfortable passenger tire? So your solution was to deflate it to make the tire more squishy on the bumps? Why not just put P tires back on it? Why did you buy an LT tire? They make allterrain P tires.

 

If the tire is stiffer, itself can support more weight with less air. Be like saying a solid rubber tire neeed 2000psi

All the manufacturers you are calling are giving you minimum pressure in order to cover their ass. 65psi will get any light duty (smaller than 3500/f350) by without failure. If they told you 35 and you put them on a super duty and they failed, you would try and blame them

 

This is where you fail.

But its clear you are just trolling.

 

How so? Please explain, and don't just throw out load specs like a moron

 

I did earlier and now your trolling.

You are welcome to remain convinced of your own bias.

Post #64 has a link with some interesting info.

You have to open your mind instead of sitting there like you know it all.

 

Run flats have stiff sidewalls. doesnt mean they wear evenly with no air in them.

The sidewalls support the outsides of the tire. not the center of the tire which can only be adjusted with pressure

 

100% wrong. i had the tires on there for MONTHS. this was just me checking tire pressures at one time. they ran PERFECLTY fine at 32lb and got like 40,000 miles out of them. Obviously you are fishing at ways to sound correct

 

Actually I just made an assumption and asked a bunch of questions you avoided answering. Theres nothing to be "right" about or fish for.

Was 40,000 miles the best you could do?

 

Run flats on all models I service call for the exact same pressure as their standard load non runflat counterparts. Try again

 

So this is what I don't get.

Our 3rd gens weigh 5600 lbs fully loaded - that's 1400 lbs a corner (assuming even weight distribution for this thought problem - we know it's not). Why are the OE tires rated at 2172 lbs, so much more than this figure? Is this due to a static/dynamic load consideration? A safety factor?