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Its not difficult but complicated. If you use yust enaugh pressure for the load and speed used, the tire inside gascompound rises to about 60 degr C/ 140 degr F on a ambiënt temperature day of 20 degr C/ 68 degr F. How long it takes ???? Mayby 15 minutes when driving that speed constantly...

I have them under our Skoda Superb, yust because trusted brand with reasonable price. But if next time for instance michelin is cheaper, I yust as well buy them. From Vredestein I got the official european used formula to calculate ttrepressure for load end 2007, wich started my tirepressure...

In US they step over yust as easy for Jeeps and other, from standard load P-tire ( AT 35 psi), with already comfortable reserve, to even E-load LT tire ( AT 80 psi) , wich then need about 10 to 15 psi higher pressure for same load. So here the swich from 91 loadindex AT 36 or 35 psi to LI 94 AT...

Here the list. Used loadindex 93/ maxload 650kg/1433 lbs AT 65 psi, for reasons given in my former post #43. In front of cold psi, for if you ever weigh the single axle, and behind the cold psi for total weight, expected 3000 lbs or more, of wich assumed 10% on hitch. Then you dont need to do...

So now you have ST 17580R13 loadrange D Maxload for single 1570 lbs AT 65 psi cold pressure wich is notthe maximum allowed cold pressure, that is higher. Continental groop puts in Europe also a 10 psi higher " maximum inflation pressure "on sidewall often. And max speed of tire 130 kmph/81 mph...

Acording to my list, the notorious 26 psi of FF affaire, would cover 2810 lbs axleload for the new tires, with maximum reserve, at wich comfort and gripp still acceptable. Max speed 99mph, is a max speed you can control yourselfe, to stay below, I think. So, topicstarter, what are your GAWR's

https://bobistheoilguy.com/forums/threads/calling-capri-racer-inflation-pressure-on-tire-size-change.380586/#post-6830124 In this topic post #10 I explain some things, and give a list for the tire used there. So read that first, and then I can make a list for your old and new tires too. Then...

Recomended pressure of yours 35 psi is not always calculated anymore for GAWR's and maximum technical carspeed with no reserve build in. Often, as I suspect here, yust reference-pressure as already explained, that 35,36,41 or 42 psi. If calculated it probably gives something like 25 psi for...

That list Overkill gave in post #50 the P-tires are calculated loadcapacity's with the calculation before 2006, with power 0,5 in it (= root), and gives to high loadcapacity's for the pressure, so lead to lower adviced pressure. But gives the loadindex 114 / 2601lbs maxload AT 35 psi, so now...

Pictures more from the side of tire, would better see the sidewallbulb. Goal of determining pressure is to get a deflection so heatproduction a cycle, that wont overheat the tirematerial. Knowing this you can also measure the goal directly. My estimation is that with 100% used of...

I have been looking in the desighners guide of ETRTO, wich I downloaded for free from pdfcoffy. In there for standard load personscartires loadindexes. For the 265/75R16 they give loadindex 116 Is 1250kg/ 2756lbs maxload, and also gives a power to use of ^0.65 to calculate the maxload for XL/...

My idea is that a tire made for higher pressure is stiffer to hold the higher pressure in. By that overgoing curve from unloaded radius to flat on the ground is larger. By that surface length on the ground, so surface on the ground is smaller at same deflection. This had to be compensated by...

In my list I gave the GAWR's at front 50 psi, and rear 47 psi. So assuming you still dont overload the axles with your 2000 lbs in the bed ( explain bed to this european guy). You can use those pressures and drive 99mph constantly. You probably wont drive that if the pellets come from 2 blocks...

Yes it does. lower max pressure( referencepressure) belonging to lower loadrange gives higher loadcapacity for the same pressure. This leads to lower needed pressure for the same load on tire. For that reason for instance E-load of same size needs about 15psi higher for the same load on tire...

That chanches a lot. Made new list, forget the list I gave earlyer. And because also GAWR's given, we dont need to know what the maxload of the P tires where. Your GAWR's together 7675lbs, and GVWR 6200LBS, gives a comfortable reserve of 1475lbs to shift some weight. Could indicate that GVWR can...

Google apears to be not the most reliable source. First found LI 112/109 AT 50 psi. But now I found Loadindexes 114, 119, 123 for singleload. One 119 gave XL wich AT 42psi. And 123 gave 10pr wich is E-load AT 80 psi mostly. That close together that I think Exeption to the rule mayby E-load AT...

When I look at the 2nd picture again, after the rimmsize its not clear. Can also be a D-load with higher loadindex. So topicstarter, will you read it from sidewall again, to be certain. If D load, I have to make a new list, in wich lower loadcapacity's for the same pressure.

Now I see it too, so thanks. Googled the tire. Found 112/109 loadindex and 6pr/LRC/C-load is AT 50 psi referencepressure. So I was wrong about the P-tires, but still the OEM tires most likely where P, because of the 35psi recomended pressure. Then I made you the list, assuming rear singleload...

Most likely your new tires are also P-tires with reference-pressure 35 or 36 psi. The 50 psi then is the maximum allowed cold pressure. The difference between both is used in the official system, to highen up the reference-pressure for speed and camber angle, with a system depending on...

Made list for that tire, using 90% of the loadcapacity for 99mph for the pressure. And axleload given, so you dont need to go adding reserve and deviding by 2 yourselves. So yust search acurate determined axleloads in the list and use pressure behind it. Succes with that, the most tricky part in...