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The standard load has loadindex 96= maxload 1565lbs AT 36psi. The XL loadindex 100 = 1765lbs AT 42psi 50 psi is the max allowed cold pressure. 30psi for the SL stands for loadcapacity up to 99mph of 1352 lbs. 1352 lbs on XL needs 30.1 psi, so practically the same 30 psi, because the SL 30 psi...

If you give GAWR'S,and max speed you use, and wont go over for even a minute, I can calculate fort that. If carmaker calculates it, they also use the GAWR'S and max technical car speed( topspeed in the books.

Answer to post #10 In Post #8 I first gave answer that 61 psi should be used, higher then others wrote. In Post #9 , I warn that the list given is old, because given loadcapacity for the pressure is to high Since 2006 US uses for P-tires the better calculation for those lists, that Europe...

Checked the pressure/loadcapacity list for the P-tire that Overkill gave in post #4. Apeared to be calculated with the old calculation for P-tires with hight/width division /50 and lower. Your sise is a /65 . But that for /50 and lower is a bit saver, but stil leads to higher loadcapacity's...

What loadrange is your new LT C-LOAD AT 55 or 50 psi D-load At 65psi. E-Load AT 80 psi. Read back and already saw E- load is loadindex 123 35psi was the reference pressure of Standard load P-tire( the given list here gives 36psi, used in european system) and is nowadays often given. If...

My calc with LT american formula comes to 58 psi to carry the 2470 lbs as maxload is of XL P-tire LI 112 With European calc 60,5 psi. But 41 psi is most likely a not calculated vallue, yust reference pressure of XL in american system. So most likely calculation with use of GAWR'S would give...

I see you have a verry variable use of the truck, so my generalisation dont go for you. But you can also choose , to drive at lesser speed , when using high weights on axle ( ends) Rule of tumb , tiremakers also use is for every speedcodestep= 10 kmph= 6.3mph different 1 loadindex step...

Then first about the loadindex of the 285/75R17. 121/118 Its stangely low. A 225/75R16 tire in LT has 115 AT 80 psi loadindex. European C-tyre in same sise LI 118 AT 77psi and LI 121 AT 83 psi. Seached with google, but only saw LT. I think in Europe the 285/75R17 is not an interesting sise in...

Mayby I was generaling to much . The GAWR rear of 4100lbs +10% reserve is 4510lbs . This gives next calculation for P tire. (4510/( 2x 2472))^1,25 * 36psi= 31.2psi , so not the 28psi in your case. But there are also cars of wich the OEM P- tires , one can carry almoast the complete GAWR. Will...

All true, but the 35 psi is most likely a standard advice and not calcated for the GAWR's and max technical car speed. Most likely ( but I have to calculate) mayby even 28 psi covers the GAWR's Then the E load LT needs 38 psi for fully loaded ( estimated) , and you dont drive fully loaded 99% of...

When going from standard load P-tire to E-load LT substantial higher pressure is needed for the same load. But who is that crazy to make such a change ;)

Mayby the pirelli's are less rigid tires, and for that reason have more surfacelength on the ground at the same deflection . And the deflection counts for heatproduction, so determining maxload of tire. You could simply measure the deflection to check if the same for both tires , if the same (...

I have not checked if 225/50R17 of topicstarter are 94, 93 or 98, yust assumed you searched it richt. And as you write both sises are available in 94 and 98 LI , the 98 must be XL. But on tire-sites not always is given , if its an XL, so you then can conclude its a SL . Edit: googled it and...

On bicycle tires indeed a range in pressure. I thinks its because they can come loose from rimm when to low pressure. But cartires dont expand that much under pressure, and mostly have 2 humps ( 2x PANG when mounting) to prevent tire comming loose from rim. In the official european calculation ...

The maximum cold pressure of normal car tires, is not the pressure the maxload is determined for, called reference-pressure. Max cold 44 to 51psi and for XL sometimes even 60 psi. Reference-pressure Standard load 36psi and american system 35 psi, but with the change of calculation for pressure/...

The 98 loadindex of both sises is an XL /reinforced / extraload tire and carries the maxload of 1653lbs AT 42 psi. The 94 loadindex 1477 AT 36 psi. Then the 98 needs slightly higer pressure for the same load. You looked it up in the standard load list 98 LI. Looked it back 31psi gives 1301lbs...

OK then , I will give a list of howmuch the pressure can maximally highen up or lower down extra if enaugh liquid water in the tire. Assumed recomended pressure filled at 68 degrF , and water as gas 100% humidity . Then i substracted what the partial pressure of watergas rises or lowers the same...

Read back my post #23 for that. And I will search for my post elswere in wich I explaine why its different for low pressures then high( used for trucktires). Has to do with the difference between gaugepressure and absolute pressure, wich are closer together at high filled pressure, then at low...

Can be an indirect system that works by ABS system . Then it determines lower pressure by lower roling-circumverence. If so, no pressure is registrated so can never be shown to you

Can you make me wiser about the temperature BMW includes in their I-drive . Mayby I can use it to prove my statement about that lower ambiënt temperature can do with lower pressure. But more important at higher ambiënt temperature you need higher pressure. As described in post # 23. Can do it by...