Do you use different tire pressure than what's on the door jam?

Hi,
I added Duratracs to my '22 SR5P. Just wondering if you guys that have changed tires also changed tire pressure other than what it calls for on the door jam when they are stock tires?

Never really changed tires to a more meatier tire before. Duratracs are same size as stock if that matters. Just looking for opinions.

Don't off road, more for snow and changing looks....

Thanks
Dave

 

Don’t listen to door guidelines for aftermarket. I don’t know about duratacs but my grapplers run at 38 for dry/summer conditions

 

The stickers are a guideline for the tires that came equipped on said vehicle.

Many factors will cause you to have either a slightly higher or lower tire pressure such as constant load, climate, etc.

So no, even with the tires equipped on said vehicle from the factory, you will not run the exact pressure specified.

Switching with another brand tire, even if you maintain the same size, is another variable altogether.

Do a chalk test and that'll get you damn near exactly where you need to be without involving mathematical equations and the sort.

 

34ish psi is my preferred air pressure. I use the same for both 265s & 285s. The shape of the thread when I look low straight looks good to me but haven't done a chalk test. This experience includes Duratracs driving about 4hours straight (until I stop for a rest) and tires were not abnormally hot.

I used to run 32psi on 275/70R17 Load E KO2s as they were too firm for me and wish I could go even low for some comfort but end up selling them.

 

No. I typically run a little higher, I've been running 38 on the 4Runner because I do a lot of highway driving, and that's been pretty good as far as ride, handling, and tire wear. I recently dropped that down to 35 to see how that goes.

When I first got my tires installed, I thought they rode really nice, then I realized after I got terrible fuel economy that tank that they had aired them up to only 32 psi.

I recently aired them down to 25, then did a bunch of 40mph pavement driving between trails. It rode great, and seemed to handle okay, though I wouldn't take it on the highway like that.

 

"Do a chalk test and that'll get you damn near exactly where you need to be without involving mathematical equations and the sort"

Thanks for all the great info, just don't know what a chalk test is. I will google it. Thanks again.

 

I, personally, run 32 front, 34 rear. It seems very comfortable, as far as highway ride goes, and I have great off road traction. I looked when I first put these tires on, Toyo AT3's, IIRC, and both front and rear look like the tread touches all the way across.

Just my experience. I may be able to air them up to 35 all the way around, but last winter I had super good traction, so I think I'll stick to what I know works. at least through this winter. I may do some experimentation next summer.

Good luck to you!
Pat☺

 

Is there some rationale for running different pressure front vs. rear?

 

For me, it’s to keep as much contact patch on the road as possible. I run 45 psi. front and 35 psi rear in Falken 285/70/17 MT’s load range E, i do not carry a lot of weight daily and the chalk test says this is what i need. If i get a load in the back i adjust the psi accordingly.

 

... unless they are the same size and load range as stock.

...and any tire in the stock size and load range




Lots of opinions in here.

If you're running the stock size and load range, your best bet is to run the pressure on the door jamb.

If you change size or load range, adjust according to this calculator: This is a safe starting point. A lot of folks will run lower pressure than recommended for LT's, and higher than recommended for SL’s. But, this will tell you the safe pressure based on your vehicle, and whatever size/load range you switch to.

Adjusting by a few PSI is probably fine. Just don't be one of those idiot hypermilers running around at maximum inflation.

 

I am running stock size Toyo open country at3 in E rating... After consulting Toyo directly, I run mine at 43 Psi.. runs smooth and wear good. You can use a calculator for this, it needs your stock tire size ,load rating , and psi, and it is calculating it for you.. using the calculator it was telling me to run them at 44 psi.. but Toyo responded to my email saying to me to run them at 43 for a 22 4runner. I don't know for goodyear, but on Toyo website, if you add your vehicule and go through all the tires available for your rig, they tell you in the spec at which Psi to run them depending on the size and load rating you take. Best bet is always asking or checking directly with the tire company.. I think. I mean they know their tire best!
Sorry for my English, have a nice day.

 

I've done a "chalk test", sort of. Involved driving a ways, at least enough to allow the tires to rotate once completely. Then, I looked to see whether the tread touched the dirt all the way across, but not squishey. In other words, I started at 45, and dropped 5 PSI until I got the tread all the way across. Then, I put in 1 PSI at a time until the edge of the tread JUST lifted off the ground. That told me what pressures I needed.
This started when I lived in Yuma. I had PLENTY of soft dirt areas to work with, even in my yards, front and rear. A quick brush with a cloth would be more than enough to eliminate the previous test's marks.

Works for me rather well. Only thing is, I have to watch the tire guys when they install, or rotate, the tires to ensure they get the pressures I want.

Again, this was just my way, for what it's worth. If there's a better way, as mentioned by MATH1840, I'm willing to give it a shot.
Pat☺

 

I’ve got 34 psi but there not mounted yet. Will it change the pressure with the truck weight on them?

 

Yes.
35 psi all around on my 285's (FWPATWlll)

 

I run 34 all around mostly because this is the most sensitive annoying tpms of any vehicle I have owned. If I keep them at 32 and it gets cold at night and a wheel drops to 31 it puts the light on. So I have bumped them to 34 to give me a buffer and haven't had an issue yet and the tires are wearing well so far.

 

All the Time depending where I am. From 15 PSI when off road to 34 - 35 PSI on Pavement.

 

Not really. All tires are different. And who’s to say he isn’t running all weather runflats.

 

No, they're not. At least, not as far as load carrying capacity. Tires have to be manufactured to meet certain standards.

All tires in the stock size and load range can be run at OEM pressure.

Proper tire pressure is based on tire size, load range, and GVWR. All tires in the OEM size and load range safely carry the same load at the same pressure.

As far as "all weather runflats"; If they're the same size and load range as stock, they can be run at the same pressure.

If people want to adjust pressure by a few PSI, that's their own business. It doesn't make that the proper pressure.

 

Good point! I run anywhere from 12-25 on trails, depending on the situation, and which tires I have on at the time.

 

Agree to disagree


You’ll get different results on every brand of tire doing a chalk test. All tires are different. Same in the motorcycle world. Every tire is engineered in specific ways. Is the 1-2 psi difference going to matter? Not on a 4runner.

 

I just don't believe there is anything thing scientific about a chalk test. At best, it might show you what pressure will yield the most even treadwear. But, that doesn't mean it's the appropriate pressure.

Like I said, people can adjust their tire pressure a little bit and it's probably fine. I certainly wouldn't go lower than 32, though, unless I were going with larger tires in the stock load range.

 

All tires in a specific size and load range require the same pressure to carry the same weight. And an LT requires higher pressure to carry the same weight as a P-rated tire in the same size. Tires are manufactured and tested to standards.

All the chalk test does is make sure the face is flat. Change to a different rim width and the chalk test PSI will change...but it does not change the pressure necessary for the tire to carry the load (per the ratings). You might be fine because of safety factors but those exist for a reason too and venturing into them can have poor results.

Agreeing to disagree does not change the fact that he is right...

 

No

 

Hey, nice first post, but typing that up without backing it doesn’t mean you’re right, either. Tire brands are different. Treads are different. Construction is different. DOT standards may be the same, but because DOT says 38psi doesn’t mean that’s what works best for the tire.

 

If you look in the specifications of any tire in a given size and load range, they are all designed to carry the same load at the same pressure. That is what matters, in my opinion.

If some folks prefer to use a piece of chalk over relying on industry standards, that's up to them. I just don't think it's good advice.

There is literally nothing to back up any claim that a chalk test is the proper way to figure out tire pressure.

 

No one said a chalk test is the best way to determine your pressure. I don’t even use it.

 

Maybe you didn't say it was "the best way", but you used it to support your point of view.

 

absolutely, and you’ll get different handling results on every tire.

 

Sure. But, that doesn't mean you just throw out the recommended tire pressure.

All a chalk test does is show you how flat the tread is while you drive back and forth in your driveway. It's not something to decide what pressure is appropriate to drive around at.

The door sticker states the tire size, load range, and recommended pressure. It has nothing to do with brand or model of tire.

 

The mention of DOT standards and applied load ratings for a vehicle is right. Comfort and chalk is a feel good approach, not a standard. Considering at my work for our trucks and trailer, we have several brands of tires across 300+ trucks and even more trailers, but all are set based on the DOT standard. There is a legal obligation, and liability risk of moving off that standard. The drivers don’t get to apply their own opinions, and our trucks will get randomly checked by our yards to avoid issues with any random ministry of transportation checks, as well as insurance risks.