BFG KO2 what psi to run?

calgator73 · May 13, 2015

You'll notice on the previous data that the load per PSI decreases as PSI increases. The following chart is an extrapolation of that data broken into 1 PSI increments:

35.00 1750 36.00 1786 37.00 1820 38.00 1854 39.00 1888 40.00 1920 41.00 1954 42.00 1988 43.00 2021 44.00 2053 45.00 2085 46.00 2124 47.00 2162 48.00 2200 49.00 2238 50.00 2275 51.00 2302 52.00 2327 53.00 2352 54.00 2377 55.00 2400 56.00 2431 57.00 2461 58.00 2491 59.00 2521 60.00 2550 61.00 2577 62.00 2604 63.00 2630 64.00 2655 65.00 2680

Silverado-Hareek · May 13, 2015

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

Yeah I hate that they don't make the KO's in load range D for an 18" rim. I should have kept the wheels off my old truck. I'll probably end up going with the Michelin LTX AT2's now.

SoonerDPT · May 13, 2015

In case anyone was interested in the KO2 in a 305/55/20, I just got an email from BFG saying they won't be available till September 1st...

titan01 · May 14, 2015

Thanks for all the info guys. Found a table and it looks like around 42-43psi for my 275/65/18 KO2's is about the same load rating as the stock 265/65/18 SRA's at the 35psi that the door sticker shows. I have aired them down to 43psi.

MR. DRAG SLEDDER · May 15, 2015

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.

what is the Chalk Test?

crafferty · May 15, 2015

what is the Chalk Test?

Once you have inflated your tires, added a payload or a trailer you can do a chalk test. You simply take a piece of chalk and draw a straight line across the tread. Then drive forward so the tires make a full rotation and you can see if your whole tire made contact or not with the ground. Then if it didn't make contact you can look at and tell if its over or under inflated.

nadrojcote · May 15, 2015

Does anyone have the load chart for dynapro atm 305/45r22 xl? Im running them at 35 psi

FLHRSI04 · July 20, 2015

275/65/20 Running 35 psi as directed by Discount Tire. Truck rides great.

Omar1 · July 20, 2015

I run with 30 psi (more than a year and nothing happened so far) and one of my friends done 25 psi and also nothing happens except much improved ride

The recommended 50 psi or whatever insanely high psi is only if the truck weight is near the recommended tires load.

for example if the 4 tires has a load of 12,000lbs with 40 psi this means if you reduce the pressure the 12,000lbs would also be reduced

and don't forget to inflate the tires to 40~psi when you need to pickup high loads or exceeds recommended speed such as 100mph

Edited July 20, 2015 by Omar1

nadrojcote · July 20, 2015

The reason LT tires should be ran at higher psi than P metric tires is because at lower psi they aren't rated to carry as much weight as a P metric. On our trucks I would assume they should be run at atleast 40 psi without causing uneven wear and damage to the sidewalls.

KARNUT · July 20, 2015

I run my tires 30psi cold, no mater the ply or load rating especially on my one tons for ride quality. When I'm going to haul a load I add air pressure to cold max so the tire doesn't overheat and separate. Doing it 40 years no problems. You can run max cold pressure if you want and want to bounce all over the place, I prefer a smooth ride.

Sent from my iPhone using Tapatalk

nadrojcote · July 20, 2015

According to toyo's load charts.. Pretty sure these load ratings are set as standard for all manufacturers, but I could be wrong.

http://www.toyotires.ca/sites/default/files/imce/LoadInflation_Table_P-LT_102913.pdf

p275/55r20 (stock good year sr-a) is rated at 2315lb at 32psi (recommended stock psi)

lt275/60r20 is rated at 2470lb at 50psi

2290lb at 45psi

2110lbs at 40psi

1920lbs at 35 psi

2470lbs - 2290lbs 180

-------------- = ----- = 36 lbs per 1psi increase from 45-50

50psi - 45psi 5

2315-2290 = 25lbs

correct psi to match stock tire load would be rounded up to 46psi

do what you want with your trucks I guess, but I cant see them lasting as long as they should when aired down so low.

Edited July 20, 2015 by projectsummit

nadrojcote · July 20, 2015

275/65/20 Running 35 psi as directed by Discount Tire. Truck rides great.

lt275/65r20 is rated at 2680lb at 50psi

2475lb at 45psi

2280lbs at 40psi

2475lbs - 2280lbs 195

-------------- = ----- = 39 lbs per 1psi increase from 45-50

45psi - 40psi 5

2315-2280 = 35lbs

correct psi to match stock tire load would be rounded up to 41psi

not to call discount tire wrong, I'm just doing simple math according to the load charts.

Edited July 20, 2015 by projectsummit

robvas · July 20, 2015

46 front 42 rear

275/60-20

I had them set at 40/36 but this rides and drives much better

Edited July 20, 2015 by robvas

irish4life8911 · July 20, 2015

I contacted Toyo directly when I purchased my Toyo Open Country M/T's (275/65/20 E rated, max 80 psi) about what tire pressure to run. They inquired what vehicle I drove, stock wheels and tire size, and manufactured suggested air pressure foot stock tires. They said that they recommend 48 psi and that's what O run.

No problems in 1000 miles so far