Chalk test

[Stonetree]

My MT Baja Boss AT's (37x12.5x17) sweet spot is 32/33. You're not going too low. I called and spoke with MT (very helpful btw) and they did calculations based on old tire load rating/size, vehicle weight, new tire size (37's), etc and said for me to "start" at 33 psi. Haven't chalk tested and won't as they are just right for my comfort level. Good luck.

That's good to hear!

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[Aonarch]

I start with a load inflation table, since PSI is size and weight (vehicle, not tire rating) specific.
Adjust from there.
https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

25psi in that tire size supports around 4700lbs of vehicle weight. How heavy are you?

This is exactly why I do not like Load E tires for example on a light SUV.

 

[jzweedyk]

Does anyone have the load inflation table for the 37x12.5r17 Load Range C KO2? I can't seem to find it, and BFG has been less than helpful.

 

[kodiakisland]

This is exactly why I do not like Load E tires for example on a light SUV.

Load rating has nothing to do with proper PSI, only max PSI.

 

[kodiakisland]

Does anyone have the load inflation table for the 37x12.5r17 Load Range C KO2? I can't seem to find it, and BFG has been less than helpful.

It’s the same as any other brand tire. The one I posted above from Toyo works.

 

[jzweedyk]

OK, Thanks. It only goes down to 25, but even at that those tires are rated more than the Bronco weighs. So for my 2 door 28 PSI is fine. I will do 28 around town and 35 on the highway.

 

[kodiakisland]

OK, Thanks. It only goes down to 25, but even at that those tires are rated more than the Bronco weighs. So for my 2 door 28 PSI is fine. I will do 28 around town and 35 on the highway.

You do have to factor in that is a static rating. For on highway you want around 1.6X static rating. There is an official conversation rate if you can find it, but I go with 1.6.
Yeah, 28 is fine.

 

[FoxFour281]

What's the minimum psi to avoid that error?

I think it's 33 or 35 psi... somewhere in that ballpark.

 

[Stonetree]

I think it's 33 or 35 psi... somewhere in that ballpark.

Looks like I'll have to do some trial and error then.

 

[Alanp970]

I had 35x12.50 17 BFG KO2’s E’s on my Gladiator and found about 28 psi gave a good contact patch. I had almost 55,000 miles on them when I traded it in on my Bronco and they had a lot of tread left and never gave me any trouble

 

[Stonetree]

I think it's 33 or 35 psi... somewhere in that ballpark.

I was testing this out today. Seems to be under 35 triggers the low psi error light.

 

[Silver-Bolt]

I was testing this out today. Seems to be under 35 triggers the low psi error light.

I am down to 32psi on the factory tires with no warning lights. It even shows 32psi on the dash.

 

[Stonetree]

I am down to 32psi on the factory tires with no warning lights. It even shows 32psi on the dash.

Interesting. Maybe it does auto-adjust over time.

 

[Silver-Bolt]

Interesting. Maybe it does auto-adjust over time.

I know with Forscan the threshold can be adjusted but I have not done so.

 

[Aonarch]

Interesting. Maybe it does auto-adjust over time.

You can adjust with forscan, but you are correct, it does auto adjust over time.

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