28 / 25 PSI - Are you kidding me ?

[jav_eee]

I watch the tpms on long highway drives to gauge heat. Hotter the tire, higher the pressure, it's normal for it to go up 1 or 2 psi, any more than that and you are getting excess heat.

You must live in an awesome climate. I’m in Deep South Texas and my pressures climb more than 1 or 2 degrees.

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[bleda2002]

You must live in an awesome climate. I’m in Deep South Texas and my pressures climb more than 1 or 2 degrees.

I'm in Florida, if I start at 28 I'll get to 30 maybe 31 or so on the highway, I also park outside though so my tires get a ton of sun to start with

 

[SargeDiesel]

The required PSI has little or nothing to do with the actual load range of a given tire......This is all about air volume.

I would not necessarily disagree, but only because the two are basically the same thing, just described and calculated differently. I prefer to use the load range for my calculations vs. calculating volume. Max load is a know number provided by the manufacturer and stamped on each tire. No guess work. Max load it typically determined by the load range of the tire.
Pretty much EVERY psi calculater that I have seen/used used max load in their calculations.

 

[Nukizer715]

I have a 2023 Sport S, gasoline, Max Tow running Kenda Klever R/T 35X10.50R17 8-Ply on factory wheels. I DID do a chalk test and found the most even weight distribution across the tread was right at 28 psi at 80* outside temps here in south central Texas. I had to use my tazer to program the tpms lower limit to 25 psi. hope this helps.

 

[CrazyCooter]

I would not necessarily disagree, but only because the two are basically the same thing, just described and calculated differently. I prefer to use the load range for my calculations vs. calculating volume. Max load is a know number provided by the manufacturer and stamped on each tire. No guess work. Max load it typically determined by the load range of the tire.
Pretty much EVERY psi calculater that I have seen/used used max load in their calculations.

If you look at the lines in the load tables that include different load ranges (say D, E, and F) of the same sized tire, you might note that the pressure required by a given tire size at the same load is the same regardless of it's load range...however the lower load range tires are obviously excluded from the higher pressures/loads.

This further backs up the idea/theory that air volume is the deciding factor. More air pressure requires a heavier tire construction to handle the higher air pressures increasing volume.

I say run whatever makes you happy so long as it's not less than the required volume required to support the load place upon them. From what I have read on the internet over the years, most people run over inflated. I suppose so long as a person doesn't go too far, it's not unsafe to do so.

 

[SargeDiesel]

If you look at the lines in the load tables that include different load ranges (say D, E, and F) of the same sized tire, you might note that the pressure required by a given tire size at the same load is the same regardless of it's load range...however the lower load range tires are obviously excluded from the higher pressures/loads.

This further backs up the idea/theory that air volume is the deciding factor. More air pressure requires a heavier tire construction to handle the higher air pressures increasing volume.

I say run whatever makes you happy so long as it's not less than the required volume required to support the load place upon them. From what I have read on the internet over the years, most people run over inflated. I suppose so long as a person doesn't go too far, it's not unsafe to do so.

I think we are splitting hairs and saying the same thing, just from different angles. Yes the PSI on the higher rated tires (D,E,F) might be the same for example, 65psi, but the max load for each rating will be different. The weight, along with the psi is whats used in the calculations.
I agree, most tend to over inflate. Thats what has lead me down this journey.

 

[CrazyCooter]

I think we are splitting hairs and saying the same thing, just from different angles. Yes the PSI on the higher rated tires (D,E,F) might be the same for example, 65psi, but the max load for each rating will be different. The weight, along with the psi is whats used in the calculations.
I agree, most tend to over inflate. Thats what has lead me down this journey.

I have been down the opposite end when the dealer inflated my load range H 22.5" tires on my Ram dually to 65psi during a recall repair without advising me. It started raining on the way home while I was flat towing my YJ......I almost wrecked in a corner because I had almost no tread on the ground and the truck tried to swap ends! I always tell the service writers DO NOT touch anything else on the truck, but they just have to "do me a favor" while it's in there. That truck ran 22 psi in the rear while unloaded in a 120psi max rated tire.

 

[SargeDiesel]

@CrazyCooter

Would you mind using the volume calculations that you are talking about to see what you come up with for the proper PSI for my vehicle ?

I wonder if they will be close or even the same as the calculator I used... would be interesting.

If you can/willing to, let me know if there is any specific information you need that hasn't already been provided.

Thanks bud !

 

[SargeDiesel]

I have been down the opposite end when the dealer inflated my load range H 22.5" tires on my Ram dually to 65psi during a recall repair without advising me. It started raining on the way home while I was flat towing my YJ......I almost wrecked in a corner because I had almost no tread on the ground and the truck tried to swap ends! I always tell the service writers DO NOT touch anything else on the truck, but they just have to "do me a favor" while it's in there. That truck ran 22 psi in the rear while unloaded in a 120psi max rated tire.

Holy crap... glad your ok... usually the tire guy is like the "oil" guy... low man on the totem pole... lol that could have been very serious. I'm thinking that I am only a few psi over... maybe up to 6psi or so, but over time, it's premature wear... not quite the safety issue you dealt with.

 

[staying_tuned]

A few have mentioned calling the tire manufacturer for recco'd PSI. I never would have thought to actually call Yokohama (in my case for 35x12.5R17 X-MT) and ask. I called today half thinking they'd blow me off or provide some vague guide. They asked for a pic of my door sticker (both the standard and the upper one with GAVR & GVWR) along with gathering details about the tire size I'm running. An hour later I get an email from Yokohama consumer affairs telling me I should run them at 27 PSI hah. I'm still kind of shocked.

 

[CrazyCooter]

@CrazyCooter

Would you mind using the volume calculations that you are talking about to see what you come up with for the proper PSI for my vehicle ?

I wonder if they will be close or even the same as the calculator I used... would be interesting.

If you can/willing to, let me know if there is any specific information you need that hasn't already been provided.

Also note that larger wheel sizes in the same tire width and diameter hold less weight. Less air volume, less capacity?

Thanks bud !

This is the one I use at the shop from Toyo, but from what I have seen.....all tire brands in a given size recommend the same pressures.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwislarL9v_-AhViI30KHUNaA2oQFnoECCAQAQ&url=https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdf&usg=AOvVaw0zaHumL9xB01d0CRYFLPCS

 

[CrazyCooter]

A few have mentioned calling the tire manufacturer for recco'd PSI. I never would have thought to actually call Yokohama (in my case for 35x12.5R17 X-MT) and ask. I called today half thinking they'd blow me off or provide some vague guide. They asked for a pic of my door sticker (both the standard and the upper one with GAVR & GVWR) along with gathering details about the tire size I'm running. An hour later I get an email from Yokohama consumer affairs telling me I should run them at 27 PSI hah. I'm still kind of shocked.

Why would you call the manufacturer when there's a load inflation table to give that info? Maybe they should promote this table better because nobody seems to know about it's existence?

The pic of the door sticker does no good for those of us who actually use our built rigs for camping.....most are exceeding the GVWR with just 2 passengers!

See my post above this one for a link.

 

[SargeDiesel]

A few have mentioned calling the tire manufacturer for recco'd PSI. I never would have thought to actually call Yokohama (in my case for 35x12.5R17 X-MT) and ask. I called today half thinking they'd blow me off or provide some vague guide. They asked for a pic of my door sticker (both the standard and the upper one with GAVR & GVWR) along with gathering details about the tire size I'm running. An hour later I get an email from Yokohama consumer affairs telling me I should run them at 27 PSI hah. I'm still kind of shocked.

I have sent an email to the manufacturer. If I don't hear back soon I will call them. Glad you had a good experience.

 

[SargeDiesel]

This is the one I use at the shop from Toyo, but from what I have seen.....all tire brands in a given size recommend the same pressures

Using the table on page 29 , the numbers correlate directly with using the axle weight x max load/psi conversion calculator.
But
what's great about what you provided, is the table on page 31, it accounts for reinforced tires (which mine is) and my calculator did not. There is a 4 psi difference between what is recommended for a standard vs. reinforced tire. Thats good to know.

So its good to have something to check and balance against each other.

So, I've been running 35 in mine, the reinforced table calls for 33. So I wasn't as far off as I thought.
I will still definitely be doing a chalk test though.

 

[Blackjeepjk]

I run 28 cold in my JTR with 37" Mickey/Thompson BB A/Ts - I've tried higher pressures but then handling gets a little squirrely on the expressways

Days of Thunder- Harry Hogge : When the rear end's loose, the car's fast. Loose is fast, and on the edge of out of control! ?

I run 38psi on Patagonia’s. Do not chalk these as their meant to run at higher pressures on highway, much lower off road. Rotate @3k
bfg AT on my 2dr I run 26-28 psi for best performance. Rotate @5k

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