Recommended tire pressure for trailer GVW 80,000 LB

What's the psi rating on the tires

 

Depends on the tires. Different brands, ply ratings and sizes require different psi.

Mine are BFGoodrich ST230, 255/70 R22.5 for step deck.

I was originally running 100psi in them. Side wall called for 120 psi cold. I've upped them to 110 psi and they are lasting longer, wearing evenly, no pitting or chunks missing.

Something you are going to have to experiment with yourself. I would start with the rating on the sidewall and go from there.

Hurst

 

I run 110.
There's a cold pressure/weight rating on them, but nowhere do I see 'Max pressure', and as I understand it most tire failures are caused by under inflation.

 

I run mine at 85 psi with 37,400 lbs on a tandem group with tire inflation system. My General ST250's are rated as low as 75 psi for 34,000 on tandems.

 

I am able to calculate a save lowest pressure for the weight and speed on tires .
Live and was born in Holland, and once got hold of the formula the European tyremakers use to calculate pressure for a sertain load ( and speed) , and went running with it.
This European formula is used for SL tires up to trucktires , in USA a different formula is used wich leads to lower pressures, though to laws of nature one formula should be used.

Will use my motorhome calculator for it in wich I use my own determined formula wich even leads to higher pressure, and to my conclusion comes closest to the ever to be constructed ideal formula.

European made trucktires mostly have a second loadindex set for other speed given , wich means more maximum load for lower speed. Also that system I did some administrative research on.

So even for trailers behind professional trucks I can calculate an advice.
So speed , load on tires is important so I also have to know howmany axles and tires under the traler and the pinload . But also different situations like fully loaded and empty. If I take to much reserve for fully loaded, when empty a lot of trembling, so have to find the best balance.

Will give text I used in other fora , more for RV and normal cars and traveltrailers, but needed data in those are the same.

Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).


So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.


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

Maximum load or loadindex. ( for trucks also additional loadindex for other speed)

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.
For trucktrailers from F- to J- load is used , F = maxloadxxxx AT 95psi , H=AT120 psi , J= AT125 or 130 psi.

Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)
For trucktires from J= 100km/62m/h to M=130km/81m/h

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). Will not be used by trucks and trailers

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


From vehicle next and mostly can be found on same plate as the original pressure advices:

GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
And configuration like howmanny axles and tires per axle ( single or dual load) and eventual tag axle ( can be lifted).

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.

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.
What is the maximum speeds for trucks with trailers in your country?

Give all that and I will calculate and give a picture of one of my filled in spreadsheets in my answer.

If other then original tires, indead as is already answered other advice is needed, a stiffer tire ( fi C-load instead of P-tire) needs a higher pressure for the same load, or the other way around, has lower loadcapacity for the same pressure.

Greatings from a Dutch pigheaded self-declared tire-pressure-specialist.

 

I'm with Hurst. 110 in all, even steers. I want them to last not ride well.

 

Higher pressure yields lower rolling resistance, so less fuel/mile. Question: doesn't 110psi wear the centers out faster? That's why I run mine (all) at 100psi, I want to replace them around 350K drives, 250K steers. Thx

 

100-110 shouldn't cause uneven wear as in overinflated like you describe. You'll likely get closer to 180-220 from steers and more like 450-500 from drives. That is about what I am getting and I am running Michelin xza3+ steer and xdn2 drives. All 11r24.5

 

Check out the tire inflation tables from the manufacturer and that will give you the best guidance. Put the pressure in the tires required to carry the load and that is all you need. In the winter you can air them 5 above the recommended value to account for variation in night time temperatures, otherwise you will be squatting down in the cold many mornings adjusting them.