LT Tire Pressure????

[dev_911]

Hi all, I am new to clubarmada.com and I have gotten some great advise and info from the Forums. I appreciate everyone's input and time!

I have a question about Tire Pressure for LT Tires. I just bought a new set of tires for my OEM Rims on my QX56. I wanted a good reliable All Terrain tire and wanted to go with Michelin LTX A/T2 tires because of the quality/reliability of Michelin as well as the user reviews. This was the only AT tire that had a 60K mile warrenty also.

The only problem with going with this tire was the fact that the A/T2 only came as a LT tire not a P tire in the 265/70R18 tire size. I ended up purchasing these tires from Discount Tire and they had 4 separate people "advise me" against LT tires because it is an "invalid application" and the vehicle will ride "stiffer and more uncomfortable."

Well, I went against their advise and got purchased them anyway. I had to wait a couple of days for the special order and when they installed, they asked me what tire pressure to run. The vehicle calls for 35 psi on all 4 tires, but discount said I should run at least 45 psi. I have been driving on them now for about 2 weeks now @ 45 psi and I am extremely happy with them, and I think the ride is smoother and a little bit stiffer, but in a good way. It doesn't feel like I am going to pop a tire by hitting a bump/pothole anymore.

I want to make sure I am running the proper PSI though. I know I can't be the only one out there riding on LT tires. What has been your experience with LT tires? What PSI do you run? Have any of you been getting the mileage expected (50K miles from a 50K warranty tire) or have you noticed uneven/premature wear? Also, I was told that if the pressure is too high, it will set of the TPMS. Is this true?

Thanks again for your input! I appreciate your time and comments!

[BlakSpyda]

Welcome dev_911!

I have not input on those tires. Hopefully someone else can help soon!

[ntrddragn]

based on what scr38 said on the other thread run them at 35 unless at heavy load then 45

[verakot]

I am also wondering why Discount Tire inflates the tires to 45 psi even though the label on my Armada states 35 psi? Any ideas?

[Pops]

I'm pretty sure only the tire manufacturer can answer that question, the answer totally depends on the specific tire and the wheel size it is mounted onto. I can tell you that I called Nitto and ran my 325/60-18 Terra Grapplers on OEM wheels at 43psi, I can also tell you if those had been a 295/60-18, or if this was a Dodge Durango, or if the wheel was a 18x9, or the tire was a Michelin AT2, that number would've very likely been very different. Tire shops work off of general common specs, the only way to get exact numbers is from the tire manufacturer.

[sts16850]

It will say on the side of the tire "max load, and max pressure". I can tell you on the new F250s that all run LT tires. They are 80lbs rear & 75lbs front.


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[9balllrook]

Welcome to the Club!!
I was told to run 40-42 in my 305/55/20 Prielli Scorpions (10 ply)



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[verakot]

Originally Posted by Pops

I'm pretty sure only the tire manufacturer can answer that question, the answer totally depends on the specific tire and the wheel size it is mounted onto. I can tell you that I called Nitto and ran my 325/60-18 Terra Grapplers on OEM wheels at 43psi, I can also tell you if those had been a 295/60-18, or if this was a Dodge Durango, or if the wheel was a 18x9, or the tire was a Michelin AT2, that number would've very likely been very different. Tire shops work off of general common specs, the only way to get exact numbers is from the tire manufacturer.

Well, here is what I found on the Continental Tire web site (http://www.conti-online.com/generato...sure_en.html):

The correct tire pressure can be found in the following places:

in the car's owner manual
gas tank lid
driver's side door's edge
door post

The air pressure listed on the side of your tire is NOT the correct air pressure for your vehicle. That number is the maximum air pressure for the tire.

So looks like they recommend to follow the driver's size door label, which suggests 35 psi for all tires...

[Pops]

Originally Posted by verakot

... So looks like they recommend to follow the driver's size door label, which suggests 35 psi for all tires...

NOT for LT Rated Tires. The OEM Contis are P-Rated and should be ran at 35. LT Rated should always be ran at over 40 PSI very minimum. 3/4-ton and 1-ton trucks often run them at 65-80 PSI. 35 PSI on a LT Rated tire while towing a trailer can get someone killed.

[B cup]

Running 40 per Tire shop



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