What is the best air pressure for my tires?

[Ill4Runner]

I recently had a new set of tires mounted. The shop aired them up to 40 psi. Is that the proper psi for my tires? I don’t haul anything I just commute. 4Runner info in my sig.

 

[BadTrainDriver]

25-32 PSI most likely. Chalk test them.

Using The Chalk Method for Determining PSI | Interco Tire

 

[ads2539]

I recently had a new set of tires mounted. The shop aired them up to 40 psi. Is that the proper psi for my tires? I don’t haul anything I just commute. 4Runner info in my sig.

If the tires are E rated, 40 psi sounds about right. Certainly not too high.

 

[BadTrainDriver]

Load rating on the tire has nothing to do with the pressure to run, that's strictly for the weight of the vehicle.

 

[MAST4R]

Load rating on the tire has nothing to do with the pressure to run, that's strictly for the weight of the vehicle.

Tires have different ratings at different pressures.

LT tire load rating drops steeply under 35 psi and the chalk test isn't exactly state of the art. Chronic overheating reduces lifespan and can cause explosion. This is per about every tire manufacturer there is. Toyo has materials available online.

Now, I, too, don't follow recs blindly so I do 35-38 depending on the load and outside weather for my ATZ tires. If I were to follow advice blindly, I would have to run like 42-45 which would result in a terrible ride. The reason is that I base my pressures on my vehicle's weight and the tires' capabilities. By contrast, tire manufacturers look at nominal generic numbers.

But I don't run less than 35 except when I am on vacation and moving on pavement at lower speeds like around Ouray or Moab. Not worth the safety risk.

I have seen more than a few 4x4 with blown MTs on the interstates. My guess is chronic overheating due to always running them too low for highway conditions.

Also, there is no difference whatsoever in the load capacity between LTC, LTD, and LTE at pressures under 50 psi. The difference is that the more robust construction allows higher pressures which in turn allow higher load rating. But an LTE at 35 psi carries the same as an LTC and likely less than a P at the same pressure.

 

[johnnygraphic]

I ran the tire pressure calculator in one of the other tire pressure threads on here and came out to 44 PSI. This is for the stock size and E Load tires. (Falken Wildpeaks AT3W). Aired them up and no issues over 1800 miles on a trip to Sedona. Aired down to 25 off road (Outlaw OHV Trail).


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[BadTrainDriver]

Tires have different ratings at different pressures.

LT tire load rating drops steeply under 35 psi and the chalk test isn't exactly state of the art. Chronic overheating reduces lifespan and can cause explosion. This is per about every tire manufacturer there is. Toyo has materials available online.

Now, I, too, don't follow recs blindly so I do 35-38 depending on the load and outside weather for my ATZ tires. If I were to follow advice blindly, I would have to run like 42-45 which would result in a terrible ride. The reason is that I base my pressures on my vehicle's weight and the tires' capabilities. By contrast, tire manufacturers look at nominal generic numbers.

But I don't run less than 35 except when I am on vacation and moving on pavement at lower speeds like around Ouray or Moab. Not worth the safety risk.

I have seen more than a few 4x4 with blown MTs on the interstates. My guess is chronic overheating due to always running them too low for highway conditions.

Also, there is no difference whatsoever in the load capacity between LTC, LTD, and LTE at pressures under 50 psi. The difference is that the more robust construction allows higher pressures which in turn allow higher load rating. But an LTE at 35 psi carries the same as an LTC and likely less than a P at the same pressure.

That's what I said, just in less words.

 

[<<<<]

OEM recommendation stated on door jamb sticker is 32. Whatever anyone prefer and reason for it is their business.

 

[Seymore Butts]

I recently had a new set of tires mounted. The shop aired them up to 40 psi. Is that the proper psi for my tires? I don’t haul anything I just commute. 4Runner info in my sig.

What is says on the door frame sticker.

 

[octanejunkie]

Do a chalk test to find out

How To Find The Right Tire Pressure For Your 4x4 Using Chalk - The Dirt by 4WP

Google "tire pressure chalk test"



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[fourwd1]

What is says on the door frame sticker.

Yes, this should be the starting point. Load range, size, etc are secondary.

Start with the doorjamb spec, then maybe the chalk test as the next step.