Tire Pressure Question....

Ronin1082

Ronin1082

New member
So I have BF Goodrich All Terrain 265/70R16 on currently. Says 65 psi Max. Door sticker says 225/75R15 @ 29 psi. I know usually you wanna go by the door but.......Well you see where my question is. Oh and I'm stock so far and I currently have all 4 at 40 psi till I can figure this out.

Thanks,
Steve
 
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Totally stock for me with 265/70/16's and I'm at 35psi. I think its wearing evenly so far. But I also carry at least 300 lbs of work related material in the back also.
 
I run mine at 30 with no problems. I'm not sure why everyone likes to crank them up so far unless it's just to enjoy the rough ride.
 
It all depends on the load of your tires.

I know with STOCK tires I use to run 33-35.

With my 265/75/16s, I'm running them at 45 PSI and not having any issues.

It all depends on the tire, manufactures recommendation, and the load range of the tire.
 
The best tire pressure can vary depending on exactly which tires you are running and the load you carry. With General Grabbers I run about 32 psi @ 70 degrees ambient temp. That seems to be the sweet spot between ride quality, tire wear and mpg. Take off one PSI for every 10 degrees less air temp. So with it 40 degrees outside the proper psi would be 29.
 
Ronin1082 said:
So I have BF Goodrich All Terrain 265/70R16 on currently. Says 65 psi Max. Door sticker says 225/75R15 @ 29 psi. I know usually you wanna go by the door but.......Well you see where my question is. Oh and I'm stock so far and I currently have all 4 at 40 psi till I can figure this out.
Click to expand...

Door sticker applies to that tire size (and P qualifies as part of the size info).

Short answer, 35 or more psi.

Long answer, http://www.toyota-4runner.org/general-discussions/110299-lt-tires-need-more-air-pressure.html
 
BTO said:
The best tire pressure can vary depending on exactly which tires you are running and the load you carry. With General Grabbers I run about 32 psi @ 70 degrees ambient temp. That seems to be the sweet spot between ride quality, tire wear and mpg. Take off one PSI for every 10 degrees less air temp. So with it 40 degrees outside the proper psi would be 29.
Click to expand...

wait. wait. you let air out of you're tires when the temperature drops?

I do the exact opposite. Lower ambient temps means less pressure in the same volume...

who's doing it wrong?
 
BlackCat914 said:
The "P" isn't related to tire size.
Click to expand...

It may seem odd, but it actually is, technically.

P and LT are two different sizing systems with very different load capacities between two tires of the same dimensions at the same psi.

So, just as psi needs to be considered with a literal size (dimension) change, it needs to be considered, as well, with a change that consists of nothing more than going from P to LT.
 
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BTO said:
The best tire pressure can vary depending on exactly which tires you are running and the load you carry. With General Grabbers I run about 32 psi @ 70 degrees ambient temp. That seems to be the sweet spot between ride quality, tire wear and mpg. Take off one PSI for every 10 degrees less air temp. So with it 40 degrees outside the proper psi would be 29.
Click to expand...

YIKES, seriously? What if you live in an area where the temp ranges between -40F and +40F in the winter? Average is probably between 0-20F everyday...
 
JB. said:
It may seem odd, but it actually is, technically.

P and LT are two different sizing systems with very different load capacities between two tires of the same dimensions at the same psi.

So, just as psi needs to be considered with a literal size (dimension) change, it needs to be considered, as well, with a change that consists of nothing more than going from P to LT.
Click to expand...

The tires are sized the same, but yes, psi needs to be considered and adjusted for the different tires to a certain extent. I think this is a very gray area. Some people say that if you under-fill a LT tire, it will wear prematurely or unevenly. And by under-fill, I mean inflate it to "P" tire specs. I disagree, as the LT tires on my truck have never had anything over 40psi, and are wearing beautifully. IMHO, just because they are CAPABLE of a higher PSI, does not mean they need it all the time. (assuming we're not towing or anything like that.)
 
BlackCat914 said:
Some people say that if you under-fill a LT tire, it will wear prematurely or unevenly. And by under-fill, I mean inflate it to "P" tire specs. I disagree, as the LT tires on my truck have never had anything over 40psi, and are wearing beautifully. IMHO, just because they are CAPABLE of a higher PSI, does not mean they need it all the time. (assuming we're not towing or anything like that.)
Click to expand...

It usually doesn't matter much as nearly all the tire sizes used on 4runners result in plenty of load reserve, but the fact that a switch from P to LT with no other changes results in a drop of around 15% in load capacity seems like more than a trivial point. Probably something worth knowing for people.

It can matter, though. For instance, were the OP to switch to LT225/75/15, the door sticker pressure of 29psi would definitely be too low.
 
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More important is how your contact patch is, if you look at a semi tire the load range decreases as the pressure drops, the tire is rated for a max load at a given pressure but unless its loaded all the time even a 1 ton does not require even close to max psi. The larger tire you install will require less pressure to get a good contact patch and good tire wear, my door sticker says 29 psi on a 265/70r16 standard load with a max of 35 psi, I run load range E 285/70r17 and find 28-30 psi to be optimal for me, contact patch is nice and ride is also very good, the misconception is a load range D or E will automatically be stiff, not true, only under higher pressures, your door sticker will be a good indicator based on that vehicles weight. Hope this helps out
 
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