What psi should I run ??

[davidb525]

They always give you the corporate answer to cover their ass.

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[HammaMan]

They always give you the corporate answer to cover their ass.

Has to be cleared through legal and all

 

[Kanuck]

I have General Grabbers for winter and Michelin MS 2 for summer.... Run 38 psi in both front and rear. Grabbers came on the truck and said to run 41 psi, which I find to hard.

Which reminds me that it is getting close to swapping over to the winters...yuck...snow.

 

[23PB&Me]

I run the OEM ATs during the summer and Falken Wildpeaks in the winter. the Ford dealership does my swap and sets the tires to mid 30s, I think they just put 36 In my Falkens when I swapped them this week. It is no where near their min pressure and a solid ride so I leave it alone.

you can put 80 PSI in them because they are LT tires that can take quite a load, but as others have noted, you might chip your teeth every time you hit a bump with an empty truck... The only reason to increase the pressure is to compensate for load. At that point numbers are kinda irrelevant, chalk test is the best because it will show you how your tire is bending and flexing with your load, optimize for good contact as noted above.

Discount tire put my Falkens up to 65 when they first installed them and it was very much not a comfortable ride. Even at mid 30s there is a huge difference between the OEM ATs and the Falkens due to design/sidewall stiffness, OEM ATs are kinda meh, also a cost down version of the actual tire...

Jealous of your KO3s, the Falkens look good, but nothing beats the look of a good set of KOs on a truck I had KO2s on my 14 Jeep Cherokee TH before joining the truck club, great tires! I went with Falkens for tested wet/snow performance due to my winter hobbies.. but mmmmm those KOs!

 

[Calson]

My 2022 F-150 has a total load capacity of 1,770 lbs for the occupants and any payload in the bed. At most it can manage 1,400 lbs in the bed of the truck and I would expect problems with rear end sag with that load. The stock rear tires are rated at 5,538 lbs and so the limitation is not the tires in terms of load capacity.

My diesel truck had a rear axle rated for 11,000 lbs and the stock tires were rated at 2700 lbs or 5400 lbs at the rear wheels with the truck itself weighing 3200 lbs at the rear wheels. With that situation I upgraded the tires to ones with a 3,750 lb load rating at 80 PSI and used the truck to haul a 3700 lb slide-in camper load. The tire pressures for the higher load capacity tires was exactly the same as for the lower load capacity factory tires and tire wear was even with thousands of miles of use.

 

[HammaMan]

With that situation I upgraded the tires to ones with a 3,750 lb load rating at 80 PSI and used the truck to haul a 3700 lb slide-in camper load. The tire pressures for the higher load capacity tires was exactly the same as for the lower load capacity factory tires and tire wear was even with thousands of miles of use.

I highly doubt this. Post the details of the tires. LT rated tires are going to require more pressure for higher loads, especially if you went higher than E rated.

 

[jadatis]

Found your size with google to be 129 S
This could be yust P-tire AT 35 psi or XL/reinforced/extraload AT 41 psi
If so on sidewall only max allowed cold pressure is given of between 44 psi and 51 psi.

On LT tires only referencepressure is given behind AT mostly, so searc for that, and give it here.

Then I will make you a cold pressure/ axleloadcapacity - list, with build in maximum reserve, at wich comfort and gripp is still acceptable.

For that , I give 90% of calculated axleloadcapacity for the pressure for 160 kmph/ 99 mph.

Then you "ONLY " have to determine the axleloads in your use 99% acurate, the most tricky part. And your responcibility.

Carmakers use GAWR and max technical carspeed to determine the recomended pressure. So is for normal use and speed to high.

Maxload of LI 129 is 1850 kg/ 4080 lbs.
Speedcode S .
So only need to know the referencepressure from you, C-load LT AT 50 psi or 55 psi in eur system.
SL and XL in eur system 1 psi higher .

 

[Spacewhitev8]

Any more pictures of the new tires? Was thinking of the same for my Tremor.

Getting installed on Thursday

 

[pittman]

Why all the high PSI advice?

LT tires can carry a higher load hence the higher max pressure on the side of the tire. That doesn't mean it's the right pressure for your truck. And you sure as heck don't have to fill it up to that number. It says maximum not minimum.

The door sticker is absolutely a good place to start when sorting out tire pressure. If you're trailering or carrying a load you'll need to air up. If not you're just sacrificing traction, ride quality, handling and proper tire wear with over-inflated tires.

If you put on a bigger tire or a one with a heavier casing and everything else is the same you'll need a lower pressure than you had with a lighter and smaller tire. It's just physics.

 

[jadatis]

On picture of post #23, I saw LRE , and those have referencepressure 80 psi, in verry large sizes 65 psi, so small chanche I am wrong. So its LT, and not P-tire, as I expected.

Made cold pressure/axleloadcapacity- list
For the 295/70 R18 129S
Maxload 1850 kg / 4080 lbs AT 80 psi upto 160 kmph / 99 mph.

if you want to use higher speed, I have to make a new list.
And gives 90% of calculated axleloadcapacity, to give that maximum reserve , with still acceptable comfort and gripp.

Only for single load axle, so if you have duall-load rear , I have to make another list.
To begin with , you could look back your GAWR's in it, but best is weighing per axle in your used loading, so also the persons.



Axleload lbs/ cold psi/ axleload kg
2088 lbs/ 20,0 psi / 947 kg
2316 lbs/ 22,5 psi / 1050 kg
2542 lbs/ 25,0 psi / 1153 kg
2768 lbs/ 27,5 psi / 1255 kg
2992 lbs/ 30,0 psi / 1356 kg
3215 lbs/ 32,5 psi / 1458 kg
3438 lbs/ 35,0 psi / 1559 kg
3660 lbs/ 37,5 psi / 1659 kg
3881 lbs/ 40,0 psi / 1759 kg
4101 lbs/ 42,5 psi / 1859 kg
4321 lbs/ 45,0 psi / 1959 kg
4540 lbs/ 47,5 psi / 2058 kg
4758 lbs/ 50,0 psi / 2157 kg
4976 lbs/ 52,5 psi / 2256 kg
5193 lbs/ 55,0 psi / 2355 kg
5410 lbs/ 57,5 psi / 2453 kg
5627 lbs/ 60,0 psi / 2551 kg
5843 lbs/ 62,5 psi / 2649 kg
6058 lbs/ 65,0 psi / 2747 kg
6273 lbs/ 67,5 psi / 2844 kg
6488 lbs/ 70,0 psi / 2942 kg
6703 lbs/ 72,5 psi / 3039 kg
6917 lbs/ 75,0 psi / 3136 kg
7130 lbs/ 77,5 psi / 3233 kg
7344 lbs/ 80,0 psi / 3330 kg/ reference-pressure
7556 lbs/ 82,5 psi / 3426 kg
7769 lbs/ 85,0 psi / 3522 kg
7981 lbs/ 87,5 psi / 3619 kg
8193 lbs/ 90,0 psi / 3715 kg/ sometimes also given maxcold of 10 psi higher

 

[Spacewhitev8]

On picture of post #23, I saw LRE , and those have referencepressure 80 psi, in verry large sizes 65 psi, so small chanche I am wrong. So its LT, and not P-tire, as I expected.

Made cold pressure/axleloadcapacity- list
For the 295/70 R18 129S
Maxload 1850 kg / 4080 lbs AT 80 psi upto 160 kmph / 99 mph.

if you want to use higher speed, I have to make a new list.
And gives 90% of calculated axleloadcapacity, to give that maximum reserve , with still acceptable comfort and gripp.

Only for single load axle, so if you have duall-load rear , I have to make another list.
To begin with , you could look back your GAWR's in it, but best is weighing per axle in your used loading, so also the persons.



Axleload lbs/ cold psi/ axleload kg
2088 lbs/ 20,0 psi / 947 kg
2316 lbs/ 22,5 psi / 1050 kg
2542 lbs/ 25,0 psi / 1153 kg
2768 lbs/ 27,5 psi / 1255 kg
2992 lbs/ 30,0 psi / 1356 kg
3215 lbs/ 32,5 psi / 1458 kg
3438 lbs/ 35,0 psi / 1559 kg
3660 lbs/ 37,5 psi / 1659 kg
3881 lbs/ 40,0 psi / 1759 kg
4101 lbs/ 42,5 psi / 1859 kg
4321 lbs/ 45,0 psi / 1959 kg
4540 lbs/ 47,5 psi / 2058 kg
4758 lbs/ 50,0 psi / 2157 kg
4976 lbs/ 52,5 psi / 2256 kg
5193 lbs/ 55,0 psi / 2355 kg
5410 lbs/ 57,5 psi / 2453 kg
5627 lbs/ 60,0 psi / 2551 kg
5843 lbs/ 62,5 psi / 2649 kg
6058 lbs/ 65,0 psi / 2747 kg
6273 lbs/ 67,5 psi / 2844 kg
6488 lbs/ 70,0 psi / 2942 kg
6703 lbs/ 72,5 psi / 3039 kg
6917 lbs/ 75,0 psi / 3136 kg
7130 lbs/ 77,5 psi / 3233 kg
7344 lbs/ 80,0 psi / 3330 kg/ reference-pressure
7556 lbs/ 82,5 psi / 3426 kg
7769 lbs/ 85,0 psi / 3522 kg
7981 lbs/ 87,5 psi / 3619 kg
8193 lbs/ 90,0 psi / 3715 kg/ sometimes also given maxcold of 10 psi higher

Thanks

 

[HammaMan]

On picture of post #23, I saw LRE , and those have referencepressure 80 psi, in verry large sizes 65 psi, so small chanche I am wrong. So its LT, and not P-tire, as I expected.

Made cold pressure/axleloadcapacity- list
For the 295/70 R18 129S
Maxload 1850 kg / 4080 lbs AT 80 psi upto 160 kmph / 99 mph.

if you want to use higher speed, I have to make a new list.
And gives 90% of calculated axleloadcapacity, to give that maximum reserve , with still acceptable comfort and gripp.

Only for single load axle, so if you have duall-load rear , I have to make another list.
To begin with , you could look back your GAWR's in it, but best is weighing per axle in your used loading, so also the persons.



Axleload lbs/ cold psi/ axleload kg
2088 lbs/ 20,0 psi / 947 kg
2316 lbs/ 22,5 psi / 1050 kg
2542 lbs/ 25,0 psi / 1153 kg
2768 lbs/ 27,5 psi / 1255 kg
2992 lbs/ 30,0 psi / 1356 kg
3215 lbs/ 32,5 psi / 1458 kg
3438 lbs/ 35,0 psi / 1559 kg
3660 lbs/ 37,5 psi / 1659 kg
3881 lbs/ 40,0 psi / 1759 kg
4101 lbs/ 42,5 psi / 1859 kg
4321 lbs/ 45,0 psi / 1959 kg
4540 lbs/ 47,5 psi / 2058 kg
4758 lbs/ 50,0 psi / 2157 kg
4976 lbs/ 52,5 psi / 2256 kg
5193 lbs/ 55,0 psi / 2355 kg
5410 lbs/ 57,5 psi / 2453 kg
5627 lbs/ 60,0 psi / 2551 kg
5843 lbs/ 62,5 psi / 2649 kg
6058 lbs/ 65,0 psi / 2747 kg
6273 lbs/ 67,5 psi / 2844 kg
6488 lbs/ 70,0 psi / 2942 kg
6703 lbs/ 72,5 psi / 3039 kg
6917 lbs/ 75,0 psi / 3136 kg
7130 lbs/ 77,5 psi / 3233 kg
7344 lbs/ 80,0 psi / 3330 kg/ reference-pressure
7556 lbs/ 82,5 psi / 3426 kg
7769 lbs/ 85,0 psi / 3522 kg
7981 lbs/ 87,5 psi / 3619 kg
8193 lbs/ 90,0 psi / 3715 kg/ sometimes also given maxcold of 10 psi higher

Don't forget factory P rated tires 5358 lbs (combined axle) at 36 psi. Vehicles aren't stationary and on the road when cornering and braking, loads aren't split 50/50.

 

[Spacewhitev8]

I run the OEM ATs during the summer and Falken Wildpeaks in the winter. the Ford dealership does my swap and sets the tires to mid 30s, I think they just put 36 In my Falkens when I swapped them this week. It is no where near their min pressure and a solid ride so I leave it alone.

you can put 80 PSI in them because they are LT tires that can take quite a load, but as others have noted, you might chip your teeth every time you hit a bump with an empty truck... The only reason to increase the pressure is to compensate for load. At that point numbers are kinda irrelevant, chalk test is the best because it will show you how your tire is bending and flexing with your load, optimize for good contact as noted above.

Discount tire put my Falkens up to 65 when they first installed them and it was very much not a comfortable ride. Even at mid 30s there is a huge difference between the OEM ATs and the Falkens due to design/sidewall stiffness, OEM ATs are kinda meh, also a cost down version of the actual tire...

Jealous of your KO3s, the Falkens look good, but nothing beats the look of a good set of KOs on a truck I had KO2s on my 14 Jeep Cherokee TH before joining the truck club, great tires! I went with Falkens for tested wet/snow performance due to my winter hobbies.. but mmmmm those KOs!

Yeah, thanks man. I heard the KO2’s were not that great in the rain but supposedly the new version ko3 are better in snow rain, and just all around. I guess we’ll see this winter. lol I’ll post some before and after pictures once they get installed on Thursday

 

[amschind]

I run mine at 40.

 

[23PB&Me]

Yeah, thanks man. I heard the KO2’s were not that great in the rain but supposedly the new version ko3 are better in snow rain, and just all around. I guess we’ll see this winter. lol I’ll post some before and after pictures once they get installed on Thursday

I still never had issues in the rain. I only had one issue on a corner now known as “oh shit oh shit oh shit corner” where I unintentionally changed lanes due to the ice/hardpack there that didn’t melted in the shade. I was over driving the conditions and got really lucky there was no one in the next lane. The KO2s still kept enough grip to not spin or slide out, it was just a long lateral move over the course of the whole corner.
I guess my biggest complaint was the noise, they were pretty loud in that vehicle.

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