How to determine your new air pressure with LT Tires.

I got falken wildpeaks at 35 psi cold pressure. More than that is too harsh of a ride for my comfort. My tire wear is fairly even across the tread pattern.

 

Even though these tires will significantly exceed the load requirements (based on the GVWR of the trailer), you need to inflate Load Range E trailer tires to their max of 80psi (cold); anything less than that and the tire will be susceptible to overheating and blowouts.

 

Your formula and math are fine. However, load carrying capacity is only one issue to be concerned with when determining proper air pressure of any tire...

However, ST (specialty trailer) tires are a different beast than P rated or even LT rated tires. They are meant to be used at or within very close proximity to their max PSI (probably should be labeled w/ 'Operational' psi instead of 'max' psi to avoid confusion; but DOT requires the sidewalls to list 'max' pressure).

...Anyhow, an E load rated ST tire and an E load rated LT tire are constructed quite differently and require different air pressures and considerations when being used. Another consideration of a tire's capabilities is its speed rating. ST tires are only rated to a max speed of 65mph at max pressure!!! At 52psi, you'd be operating the tire with only 65% of its max air pressure, and you'd have a significant reduction in the tire's ability to properly dissipate heat (especially at fwy speeds) before risking it to potential failure due to over heating. What would the new 'speed rating' of the ST tire be at a reduction of 35% of its max PSI??? I don't know, but I'd guess it's slower than you'll be pulling the trailer at on the highway.

It's your rig and your trailer, but I'd strongly encourage you to do some more research into recommendations on air pressure as it pertains specifically to ST tires and not just search for 'load' formulas. Under inflated trailer tires are dangerous to not only you but also to the people on the road around you.

 

Can someone please confirm my PSI for the tires, i keep having issues every time i get it balanced and rotated with Costco. I'm sure Costco techs are just improperly trained when they fill it to 31/Front and 33/Rear, "because that's what it says on the door". Even when my tires are bigger than stock(LT275/70 R18 125/122S) I used the calculator online but it came out to 40 PSI. When i take it Firestone for my lifetime alignment they advise me to go with 41 in the front and 44 in the back.

New Tires
Lifted Front 1.9 and .75 Coachbuilder Shackles Rear(Bilstein 6112/5100)
Tires are Bridgestone Dueler A/T Revo 3
LT275/70 R18 125/122S

Old Tires:
Kumho Road Venture AT51
LT275/65 R18 114T

Ive been pumping the front to 41 and rear to 44, but this could be wrong for the size. Any help would be appreciated from some who know much more than i do on this subject.

 

I have Cooper AT3 XLT 295 70 18 on my Sequoia. Cooper said 42lbs all around.

 

I’ve found 40psi to be the sweet spot unless you’re loaded really heavy.

 

Do you think the size of them being a little wider makes a difference in the amount of PSI?

 

Nope nothing too crazy, just regular upgrades here and there and an audio box and amp. ive been running 41 front and 44 rear, but maybe i need to have the same psi for all 4 tires.

 

Higher in the rear is tough to justify with nothing in the bed imo. The rear axle is significantly lighter than the front.

 

Maybe I’ll try 40, I run 38 all around, even on the Cload tires on the mom mobile

 

I feel like I got more edge under 40 in the E rated tires. 4R might be a different animal depending what you’ve got. I run 33-35 on the 200 because they are P rated XLs instead of LT E rated.

Run 35 on the Tree - it has 3 P rated tires and 1 LT.

 

My truck came with 285/55/20 BFG KO2s. It has a supplental door sticker that states 46. Dealer rotated them during 1 of the free oil changes and went with the original door sticker. I was not happy when I had to get compressor out and add 16 psi to all 4.

 

Hahaha I just now got that

 

That original post seems out to lunch... 36-42 psi seems to be sweet spot for LT tires depending on cargo/gear weight. I run 36psi on mine as I like the ride and contact patch. I would increase the weight from there accordingly based on load in the bed or trailer weight.