Warning: Toyo Open Country AT III EV - 275/70/18 116T - 44PSI Max not 51

[Yellow Buddy]

I had a spare set of 18" OEM wheels lying around and figured I would try to use them on my Lariat ER which came with 20" OEM wheels. I didn't want to mess with ForScan so I opted for the 275/70R18 version of the Toyos. Quite frankly, it was the only tire that would work without going to a LT and I would've rather traded someone 18s for 20s than go to a LT tire.

On paper it was perfect, the 116T matched the load rating. It wasn't an XL tire, but with a Max Inflation Pressure of 51PSI this seemed perfect. I was skeptical of the pressure rating without the XL, but I was able to verify it on Toyo's website along with the reseller. Unfortunately, when the tire came in the tire did not match the specs. The Tire was stamped for a Max PSI of 44psi. Technically, it could work as the door jamb reads 42PSI for my truck, but given that I tow and these have a temperature rating of B, I expect these to run closer to 45 PSI cold and 49-50PSI hot.

So, don't make the same mistake I made. The 275/70/18 116T maxes out at 44PSI, not 51PSI as per their specs...

If you want to trade for a set of 18" wheels, let me know....

Update/Edit: After a lot of back and forth, it is confirmed the tires have a max of 44PSI and the specs are wrong in literature. While the tires can technically be used as our doorjambs are under 42PSI, the manufacture cautioned on using them for towing as it will risk a blowout.

Props to TireRack, in researching they were the only reseller that had them listed correctly as 44PSI max. Every other reseller, including some local dealers were using the booklet specs of 51PSI.

Sponsored

 

[Rice_classic]

What is the concern here? The oem tire on an 18” wheel for this truck has a max load of 2756lbs @ a cold psi of 51. The tire you have has the SAME max load rating of 2756, just a lower maximum cold psi. Their load ratings are like for like dude..

I assume you do know that the “max pressure” is not a maximum HOT pressure right? It is the pressure for maximum load and is to be set when cold - they definitely will increase in pressure with heat (as intended and designed) around 1 psi for every 10 degree f of increase. So set them at 44psi cold if you need the maximim load rating and they will get to whatever hot temp they get to while operating.. as designed.

 

[Yellow Buddy]

What is the concern here? The oem tire on an 18” wheel for this truck has a max load of 2756lbs @ a cold psi of 51. The tire you have has the SAME max load rating of 2756, just a lower maximum cold psi. Their load ratings are like for like dude..

I assume you do know that the “max pressure” is not a maximum HOT pressure right? It is the pressure for maximum load and is to be set when cold - they definitely will increase in pressure with heat (as intended and designed) around 1 psi for every 10 degree f of increase. So set them at 44psi cold if you need the maximim load rating and they will get to whatever hot temp they get to while operating.. as designed.

The concern is the tire specs are incorrect.

With a 42PSI label and a 44PSI max, that's not a lot of headroom. With just a solo driver in the truck, probably not a huge concern. When I'm towing a 30'/7000lb trailer, I'd rather have the head room for the safety of my family and those around me.

Will it probably be ok? Maybe, but I'd rather not find out on the road. If the stamping is not correct, what else might be off or not to spec?

This brings up a different question for me: do we have an unofficial Lightning Trade/Sell forum? I'll claim gross ignorance (or negligence) for not knowing. I have some OEM tires and other F150 things accumulating in my garage that could go to a good home for a great price. Just sayin'.

Yes we do.

 

[Doctors Do Little]

The concern is the tire specs are incorrect.

With a 42PSI label and a 44PSI max, that's not a lot of headroom. With just a solo driver in the truck, probably not a huge concern. When I'm towing a 30'/7000lb trailer, I'd rather have the head room for the safety of my family and those around me.

Will it probably be ok? Maybe, but I'd rather not find out on the road. If the stamping is not correct, what else might be off or not to spec?



Yes we do.

Yeah...I found it. The advanced search is handy for those willing to invest more than a scintilla of time to find it!

 

[Rice_classic]

The concern is the tire specs are incorrect.

With a 42PSI label and a 44PSI max, that's not a lot of headroom. With just a solo driver in the truck, probably not a huge concern. When I'm towing a 30'/7000lb trailer, I'd rather have the head room for the safety of my family and those around me.

I like how safety minded you are, the world thanks you but… respectfully - you’re understanding isn’t quite there. Please understand that 44psi is NOT THE MAXIMUM PRESSURE OF THE TIRE! (Sorry for yelling). They can operate MANY psi above that when hot AND ARE designed to. 44psi is the COLD psi you set the tire to in order to utilize the MAXIMUM LOAD of the tire - the actual operating temp isn’t defined because it will range from 5-15psi above that based on temp change from cold to hot during operation.

They are not mislabeled. There is no “headroom” to account for. The max load rating is the same as the 51 psi tire but due to construction this tire ONLY needs to be at 44psi for the same load rating. That’s a GOOD thing because it means you enjoy the same maximum load rating at a more comfortable psi.

There is nothing to fret over - set ‘em and forget em at 44psi and you’ll be fine!

 

[Firn]

The concern is the tire specs are incorrect.

With a 42PSI label and a 44PSI max, that's not a lot of headroom. With just a solo driver in the truck, probably not a huge concern. When I'm towing a 30'/7000lb trailer, I'd rather have the head room for the safety of my family and those around me.

Will it probably be ok? Maybe, but I'd rather not find out on the road. If the stamping is not correct, what else might be off or not to spec?



Yes we do.

The point he is (not very politely) trying to make is that the load rating is the important part. You dont have to mix the load rating and the psi of the old tire, and the load rating AND psi of the new tire.

Your tires have a laod rating at a specified PSI, that is what matters. A 3000lb load rating with a tire at 35psi and a 3000lb load rating with a tire at 80psi is the same thing.

You can safely operate the tire up to the specified load rating. Achieving that at a higher or lower psi isnt the concern.

Now, if the specified load rating is wrong that is a MUCH bigger concern, but that seems unlikely.

Sponsored