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Old 06-12-2015, 06:50 PM   #21
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My point (contrary to some others opinions) that there is no hard and fast rule that says you need to run a tire at the max pressure.

2010 F250 5.4L 3.73
2011 Flagstaff 831FKBSS
Equal-i-zer 4pt 12K


2011 Flagstaff 831FKBSS
2010 F250 4X4 5.4L 3.73 LS
EQUALIZER E4 1200/12000
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Old 06-12-2015, 07:20 PM   #22
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I contacted the tire manufacturer for my truck. Max on my tires state 80 psi. After driving for a couple of hours the tire pressure warning light came on. The manufacturer told me 45 according to the tongue weight. He told me to contact him if I found that my tongue weight was higher and he would recommend a new tire pressure.

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Old 06-13-2015, 03:20 PM   #23
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I am able to calculate it for you but also need weights speed and tire data.
Wil give a copy I saved from other topic to show what you need to give before I can calculate.
But I can give a range in the pressures front and behind in wich no bumping and savety for the tires.

Here it is.

This is from tires next and can be read from sidewall:

Maximum load or loadindex.

Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.

Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)

If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).

If you cant find all of it give sises of tire and Loadkind, then I will google for it.

From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.

And ofcource howmany axles and total of tires on the ground behind, front always 1 axle and 2 tires on the ground.

Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.

Greatings from a Dutch Pigheaded Self-declared Tirepressure-Specialist.
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Old 06-13-2015, 06:31 PM   #24
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Jadatis you are making my head spin.

Denis, Forest river Georgetown XL 377 towing a 2014 Ford Explorer.
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Old 06-13-2015, 06:38 PM   #25
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I disagree with your Max speed theory !! The rest of it Im good with.

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Old 06-14-2015, 03:16 PM   #26
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Originally Posted by CAT-RN View Post
I disagree with your Max speed theory !! The rest of it Im good with.

Asuming you answer to me with your max speed theory.
I made a topic on RV-forum about that .
RV.Net Open Roads Forum: How to compare tires for replacement and needed pressure

To be short, maximum load of tire is calculated higher for lower speed.
Better for tire is though to use the maximum load that would be needed for 99m/h because lesser deflection, so better fuel saving , lesser heat production , and still comfort and gripp are acceptable.

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pressure, tire

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