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BFG KO2 what psi to run?

titan01
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titan01 Enthusiast

titan01

Posted
Posted

Just put on some BFG KO2 275/65/18 on my new Sierra All Terrain. The installer pumped them up to 50psi because they are E load rated. Seems a bit high to me. What psi are you guys running on your KO2's?

Thanks

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nadrojcote
nadrojcote

Stock tires and your tires OP are two totally different things. The door sticker will say 32psi, but you have load range E, you will want to be up around 40 at least.

black00ta
black00ta

Just a heads up guys, running tire pressure at what "feels good" is incorrect, tire pressure is about load carrying ability. Those of you running 8 & 10 ply's at stock 4ply tire pressure are like

calgator73
calgator73

Absolute minimum PSI for this tire is 35 PSI. This is the BFG pressure load chart for a LT275/55R20 KO2 load range D:   35 1750 40 1920 45 2085 50 2275 55 2400 60 2550 65 2680   If you call BFG

SlavO Enthusiast

SlavO

Posted
Posted

I've 20" i think i read somewhere that 40psi is want they're called for the 20" i run 38cold psi... your going to really enjoy these tires. Ive almost 20,000 miles on mine they still look brand new. And the ride is great 2 me

FormerFordGuy Enthusiast

FormerFordGuy

Posted
Posted

OP, your tires are load range E. The 20" sizes are D rated just for your info.

 

Most people run slightly higher pressure in E rated tires for numerous reasons. My installer set mine at 55 psi cold and it was too harsh. I've settled on 42 cold, but 38-40 rides pretty nice. Just play around with it until you're happy and pump em up when you tow.

Bonker Enthusiast

Bonker

Posted
Posted

I am running 35 psi for 20"

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nadrojcote Senior Enthusiast

nadrojcote

Posted
Posted

Stock tires and your tires OP are two totally different things. The door sticker will say 32psi, but you have load range E, you will want to be up around 40 at least.

  • Like 2
crafferty Senior Enthusiast

crafferty

Posted
Posted

Just send BFG an email and they will tell you where you need to be. Then from there you can see how she rides and do the chalk test if you like. But what everyone has said is correct E rated = about 40 PSI give or take a couple.

black00ta Enthusiast

black00ta

Posted
Posted (edited)

Just a heads up guys, running tire pressure at what "feels good" is incorrect, tire pressure is about load carrying ability. Those of you running 8 & 10 ply's at stock 4ply tire pressure are likely running below minimum requirements for the application.

 

I run my LT285/65R18 10ply's at 52psi to maintain minimum load carrying ability.

 

EDIT: Tire pressure is not a 1:1 equation across all sizes and constructions...

Edited by black00ta
  • Like 2
Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

Just a heads up guys, running tire pressure at what "feels good" is incorrect, tire pressure is about load carrying ability. Those of you running 8 & 10 ply's at stock 4ply tire pressure are likely running below minimum requirements for the application.

 

I run my LT285/65R18 10ply's at 52psi to maintain minimum load carrying ability.

 

How does your truck feel with the 10 ply tires? I want to put the BFG All Terrain K/O's on my truck in stock tire size but they're only available in load range E

AB64 Enthusiast

AB64

Posted
Posted

I run them on my work truck LT285/65R18s and with 20K on the current set 40psi seems about right.

black00ta Enthusiast

black00ta

Posted
Posted (edited)

 

How does your truck feel with the 10 ply tires? I want to put the BFG All Terrain K/O's on my truck in stock tire size but they're only available in load range E

 

You can tell you added the physical weight at the wheels. Combined with the stock rancho's it dances a lot over broken pavement, but otherwise rides quiet and similar to stock tires. I'm not a big fan of running 10ply tires on a 1500 but It was the size and tire I wanted. =/

I don't regret it as in my opinion the look and durability outweigh and negatives.

 

I would change sizes before ply rating anyday

Edited by black00ta
calgator73 Senior Enthusiast

calgator73

Posted
Posted (edited)

Absolute minimum PSI for this tire is 35 PSI. This is the BFG pressure load chart for a LT275/55R20 KO2 load range D:

 

35 1750 40 1920 45 2085 50 2275 55 2400 60 2550 65

2680

 

If you call BFG and get the load pressure data in 5psi increments then I can plug that into my spreadsheet and give you a more accurate PSI by PSI breakdown.

Edited by calgator73
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