Recommended tire pressure

I forgot to adjust my tire pressure when temps got cooler here in Tx...tire pressure warning comes on in am at 30-34*F (24psi I think) then goes off when I get halfway to work (30psi I also think) yet my rear tires were worn on the inner tread to near non-existant...had to get two new rear tires this weekend actually. fronts are wearing evenly. I believe my door jam says 35 cold...odd that my rears wore this way considering they've been underinflated. currently all are at 35 cold (60*F) after the new tires. really weird because usually underinflated wears outside tread and overinflated wears inside...mine did the opposite.

Stock tire size on 16's also for trd off road

also in the owner manual it gives different psi for different load weights, higher loads higher psi I think, up to 40 cold...not exactly sure.

 

The stock tire wore funny, or was it an aftermarket?
How often do you rotate?
What rotation pattern?

I'm not seeing a psi/load chart in the manual...

Stock Tacoma tires(actually, any P or euro metric)max out on load capability at 35-36 psi; anything over that is to maintain the speed rating.

Edit: Nevermind...just read your post in the 'owner's manual' thread.

 

I had my tires at 32psi for months and it seemed to be good, nice ride and fuel economy. When i got the truck I noticed that the selling dealership had them at 36-37psi
Since I took it to Hanover Toyota the other week they changed it to where they run 34-35. If that's the best for load handling then maybe I should leave it there for towing in spring and summer.
I'm still on the stock 245/75 that came with the sr5. I'd like to move up to 265/70 or 265/75 but the frugal part of my mind hasn't allowed it.

 

Having had a front (sort of speak) row seat on the Firestone/Ford lawsuit fiasco, I learned one thing, and one thing only. The people that make the tire and the people that make the vehicle speak a different language.
One is English and the other maybe Cantonese. And the only time they may communicate is to settle on a contract bid price for X amount of tires for X time period.

That said, I look at the door tire inflation sticker to find the recommended tire pressure for best comfort, traction/braking and load recommendations.
I then look at the tire sidewall and look for the max tire inflation capacity under max load. I have a C load rated tire so in my case, I can safely carry about a 1k lbs payload, at a max inflation of 44psi.
That does not include passengers or other weight in cab or tow. But since I don’t usually carry much of a load, just passengers, I keep mine at 38-40psi, it maxes out at 41-42 max when hot and I get great gas mileage. And tire life normally well exceeds the warranted tire miles.

Handling, braking and traction are not an issue for me, but comfort is a little sacrifice I maybe conceding. But that’s just me.
The way most people interpret max load maybe widely misunderstood and some may therefore be driving under inflated, which may accelerate tire wear, fuel mileage among other things.

The video below may help better understand load range if you wish more subject clarification. Some may even find it shocking!

https://www.youtube.com/watch?v=byV_Pz78PY0

 

Of course I’d be lying if I said that running higher PSI in tires didn’t concern me. But so do tire blowouts due to heat from low PSI too. The hilux does not do well in the moose test as it is, so running higher tire pressures can’t be of any help.



https://www.youtube.com/watch?v=y2QSogJj3ec

 

I keep my TRD sport tires at 29 psi per the door sticker. I do mostly around town so comfort is my priority.

 

C rated?
Your profile says Cooper AT34S P265/65/17. That has a 112 load index.

 

TOYOTA owners manual says it's C (last one at bottom)

 

Type refers to model; tire loads are under "Tire size".
A is SR
B is Offroad
C is Sport; P265/65/17/110S is the stock tire

...and I'm not seeing a P265/65/17(P metric) for an AT34S. I do see a 265/65/17/112(euro metric).

Do your tires have a P prefix?

 

I have 265/75/16 wildpeaks and the tire shop set them at 40 psi. When cold like 40° they are at ~36psi. And when 100° they are at ~45psi. Is this fine?

 

Well, there's also a 112T standard load on the tire sidewall.

"A light truck tire load capacity is dependent on the size plus the load rating. All tires of a specific size and load range will have the same maximum load capacity. For example, LT245/75R16 tires have a load capacity of 2,205 lbs. for load range C "

https://itstillruns.com/dload-ratings-tire-ride-comfort-7606171.html

 

I just noticed you have a SR...

The OEM tire is a P245/75/16/109S(P-metric) @ 32 PSI giving weight rating of 2,172lb.



You now have a 265/65/17/112T(euro-metric)



This gives you a 31 adjusted recommended psi.
Your new tire tops out on load capacity at 36 psi.
Anything above or below 31 is personal preference. Which is fine, to a point.
Above 36 is to maintain speed rating; it's an Autobahn thing.

But, I do agree with your sentiment of better to err on the side of 'over-inflation'...to a point.

 

My first set on my SR5 was a port added package that included rims, bed lights, nerf bars and few other items. The tires were BFG rugged terrains 265/65/17. Loved those tires but are no longer available.




But now I like these Coopers even more, quieter softer, more comfortable.

My only concern running higher tire pressures is the higher center of gravity making the vehicle more vulnerable to roll overs. That's what happened to the Ford explorer back in ’98-2000’ or thereabouts with so many rollovers, Ford decided to lower the tire pressures to combat the flawed frame flexing causing the issue, but the tires would overheat and blow out instead.

The good news is that today’s tires are better imo so maybe that won’t happen again.Also, no numerous highway rollover reports either, that concern me on this model.

The bad news is that history has a habit of repeating itself. So far the truck handles great, even at highway speeds and has given me no reason to panic or be concerned.
But I’m no expert test driver or have any data to support or dismiss any such concerns therefore caution is the wtg.

 

And Ford blamed Firestone tires and about ruined them .

 

My SR5 came with some stock Firestone 245/75-16 regular highway tread tires. Mine is 2WD and I use the truck as transportation for my wife and I. No hauling/towing. The dealer "switched" the tires over to nitrogen filled as part of the prep at 29PSI. I have no experience with nitrogen, the truck stays in a cold garage and the warning light is usually on (at initial cranking) during these winter months with the tires at 27 PSI on the little dashboard screen. Once they heat up to 29, the light goes off. Should I consider adding some air to the tires to get them up to 32 PSI or just let it ride? I would have to find somewhere around our town to do nitrogen fill and it's expensive from what I'm told. I have an air compressor 6 feet away from the truck. Seems stupid to go hunt nitrogen when I have free air at home. Dealer is 20 or so miles away so I don't care to ride there every time I need my tires topped off.

 

Just put air in them.

 

I run my KO2’s at 35 in the summer and 39 in the winter.

 

But of course

But it is ironic though, because in this publication (below) they recommend the opposite.

“Ford Motor Co. states that for some light trucks, such as the Ranger, higher psi levels (35 to 44) can lead to better fuel economy”
https://itstillruns.com/dload-ratings-tire-ride-comfort-7606171.html

A more truthful statement as far as proper tire inflation goes IMHO. But they left out longer tire life, so there’s that.

 

Does anyone have some experience with 255/85/r16 that can recommend a PSI?

 

I will never go 10k oil change intervals that’s foolish. They make these recommendations to serve CAFE standards, not longevity. “Experts” said the shot was “safe and effective” and it was neither.