Tire pressure for BFG KO2's

[e60ral]

none of those match the standard inflation tables, why are their loads different? is this a TRA vs ETRTO thind?

(you are right on the 112 load rating, I must have had mud on the tire or something covering the 112)

on the standard table:
113 load at 32 psi is 2299 (derated to be 2,090)
112 load 35 psi 1925
112 load 40 psi 2110
which interpolated would be 39.5 psi

 

[brian0128]

none of those match the standard inflation tables, why are their loads different? is this a TRA vs ETRTO thind?



(you are right on the 112 load rating, I must have had mud on the tire or something covering the 112)



on the standard table:

113 load at 32 psi is 2299 (derated to be 2,090)

112 load 35 psi 1925

112 load 40 psi 2110

which interpolated would be 39.5 psi

These numbers are all from calling the BFG 800 number. You give them your make, model and year and tell them what tire you have. They don't like to give out the BFG load inflation numbers but if you insist upon having them and tell them you tow a trailer they will give them. After doing research they match the Toyo load inflation tables.

 

[uplusd]

What are you guys airing down to on the trails?

 

[e60ral]

These numbers are all from calling the BFG 800 number. You give them your make, model and year and tell them what tire you have. They don't like to give out the BFG load inflation numbers but if you insist upon having them and tell them you tow a trailer they will give them. After doing research they match the Toyo load inflation tables.

Ah, Toyo shows TRA so the difference is TRA vs ETRTO

Sent from my SM-G930V using Tapatalk

 

[e60ral]

What are you guys airing down to on the trails?

Mild beach or washboarded well graded FS road 28-30, rough FS road, mild trail, or s9ft beach 20-25, rough trail 18ish

Sent from my SM-G930V using Tapatalk

 

[StuB]

Factory Dunlop's load inflation table show 2425lbs at 32psi.

I called BFG and asked for the load inflation for stock size 265/70-17 Load Range C KO2's.

40psi 2075lbs
45psi 2255lbs
50psi 2470lbs
55psi 2595lbs
60psi 2760lbs.

Her recommended psi was 45psi and she wouldn't give me numbers any lower because she said it wouldn't support the weight of the vehicle safely.

Curb weight is 4750 and GVWR is 6300. Using 6300/4=1575lbs per tire. This tells me I could go as low as 38psi safely. I run 39 front and 38 rear and have even wear

This is interesting, since the maximum allowed pressure on this tire is 50 PSI...

 

[WallyT4R]

I didn't read the whole thread but I keep my C rated KO2's at 40 psi. Seems to be just right on the road.

 

[jadatis]

You have to look at sidewall of tires, to determine the next.
1. maximum load or loadindex.
2. Will call it AT-pressure / official name reference-pressure, is pressure for wich the maximum load is calculated for reference-speed of yours probably 170km/h, and this is not the maximum cold pressure as given on Standard load ( 4ply/B-load) and XL tires.
On LT tires or your tires its mostly given like this "maximum load xxxx lbs/kg AT yyy psi/kPa(cold).
3. speedcode of tire, yours probably R= max 170km/106m/h.

Then it might prove that your tires are AT65 psi or 60 psi( exeption to the rule) and this is D-load /lrd/8PR( plyrated, european system), then the C stands for Comercial, european system eqivalent of LT.
Then the 60 psi beginning list would be the AT-pressure.

Then if you can also give the real weights on axles, and you cant yust devide GVWR by 4 , I can calculate a save pressure range for your tires, but will be front different from rear, because weight is not equally devided between axles, and even not between axle-ends .
General rule is to give both tires on the same axle the same pressure, so you then have to use the highest axle-end for determining needed pressure.

If your original Bridgestone are yust normal car tires ( P-tires ) then the AT pressure is always in American system 35 psi ( XL /reinforced/Extraload 41 psi) , European system 1 psi higher as standard, but exeptions allowed.
They only give maximum cold pressure on sidewall of those of 44 to 51 psi and for XL sometimes 60 psi, and difference is used to highen up the AT-pressure for speed and alighnment( camber-angle).
Then your new C or D load tires need higher pressure for the same load, because they are stiffer ( to hold more pressure in) and so have lesser surface on the ground at the same deflection.
Could even be that we have to derate the Loadindex/maxload given on sidewall , because these offroad tires have large profile blocks , that cover part of sidewall, and so make lesser sidewall to flex, so produce more heat at same deflection as same sises and loadrange road tire.

 

[mbumpus11]

I have E rated 275's and ride them at 43 psi. I don't think it rides rough, and I got 18.5 mpg last fill up with a combo of city/highway driving. Even treadwear and have about 50k on them with 7/32" left as of my oil change/rotation 1500 miles ago.

 

[rasber3140]

I have heard about "tire wander" with these tires. Does psi affect that at all and what exactly is tire wander?

 

[Kevo17]

Mild beach or washboarded well graded FS road 28-30, rough FS road, mild trail, or s9ft beach 20-25, rough trail 18ish

Sent from my SM-G930V using Tapatalk

Is that on a C or E rated K02?

I just got a set of 265/70/17 C

Thanks!

 

[StuB]

50psi 2470lbs
55psi 2595lbs
60psi 2760lbs

So why is BFG (Michelin) giving you PSI load ratings for 55psi and 60psi on a tire that has a 50psi maximum capacity stamped on the sidewall?

 

[83Mule]

My 275's don't wander at all run on a 17x9 wheel. You can effect the tire and stability by ''pinching'' them on a 7 or 7 1/2'' wheel as it will crown the tire profile if inflated too high. I get a nice ride and a flat contact patch at about 36 lbs in non-loaded driving.

 

[MidnightOffRoad]

I recently purchased an 18 OffRoad. I considered powdercoating the wheels, but given the price (and hassle of jackstanding the vehicle while they were at the powdercoater's) I decided to simply swap to the TRD wheels. In addition, I bought 265/17 K02s.

I had them mounted at Tire Kingdom. Watched the entire swap and the installer even let me help. Watched him "0.0 and 0.0" each wheel/tire, helped him hand tighten the lugs so to reduce the beating from the air gun.

I hadn't researched the pressure so when he asked, I defaulted to "factory specs." So he set them at 36.

Then comes the test drive. From the stock Bridgestone Dueler's, there was a natural (and expected) step back in ride quality, but it was more than I had anticipated. Not sure if it's the lighter wheels, stiffer sidewalls, but the ride in stoplight traffic was worse, but not totally unacceptable.

Then comes the highway drive. The ride was absolute garbage. I was sooooo incredibly upset. It almost felt like the wheels weren't balanced at all. Terrible vibrations and harmonics.

After researching (this thread) I decided to up the tire pressure and it solved 90% of the issue.

For whatever reason, with TRD wheels and the suspension settings, my K02's did NOT like 36psi at ALL.

The ride before was so bad I thought I'd go and get them rebalanced if maybe the other machine just was off or not calibrated correctly.

Long story endless, it seems like on a newer TRD Off Road with TRD wheels, anything less than 40psi creates some really conflicting and harsh harmonics that make the ride absolutely unacceptable. Which was really disappointing coming from an SR5 with stock wheels and BFG Rugged Terrains that rode beautifully.

Just another data point for others who might be running a similar setup.

 

[e60ral]

your tires aren't balanced

 

[neatoneto]

Whoa.. really good info in this thread.

 

[Davester40]

My conversation with BFG customer service today:

8:01
You :
I have a 2018 Toyota 4Runner and I swapped out the stock tires for a set of All-Terrain T/A KO2 Tires and I wondered what pressure would be best for daily driving. The dealer that installed them has the pressure set at 50 psi but my factory tires were 32psi. When we go off road I planned on lowering the pressure down to 20psi but daily driving is my main concern. Please let me know what your professional recommendation would be best for the life of the tires? Thank you!
You :
P.S. The size of the tires is 265/70/17 if that makes a difference

8:03
Evelyn :
We also need to know the inflation pressure for the original tire on your vehicle.
8:03
You :
As I said they were 32psi

8:06
Evelyn :
The inflation pressure the dealer installed is correct
8:07
You :
So I should run them at 50psi for my daily driving?

8:07
Evelyn :
P267/70r17=2425 lbs and LT265/70R17= 2470lbs
Yes this will carry the weight recommended for your vehicle
8:08
You :
It just seems pretty high. Will they wear even with this much pressure?

8:09
Evelyn :
Yes they should wear even with the correct inflation pressure as well as regular vehicle rotation, and vehicle alignments
8:10
You :
Yes I rotate them every 5000 miles so I should be good. Thanks for your help.

8:10
Evelyn :
Thank you for contacting BFGoodrich Consumer Care. Have a great day!

 

[T4 Leaf]

I got mine in Feb (265 C Rated) moved them up to 38/39 and saw a pick up in MPG... went to the Jamboree and ran them at 20 there, then aired them up to 35 on the way out...I've determined that 35 is a much improved ride for me...to hell with the mpg (keep in mind the 5100s add to the roughness I reckon)

But I'm still investigating the whole thing...need a new balance after the Jambo

 

[tacoyota]

I run 35 also. Good balance of ride and mpg.

 

[Frasty]

I recently purchased an 18 OffRoad. I considered powdercoating the wheels, but given the price (and hassle of jackstanding the vehicle while they were at the powdercoater's) I decided to simply swap to the TRD wheels. In addition, I bought 265/17 K02s.

I had them mounted at Tire Kingdom. Watched the entire swap and the installer even let me help. Watched him "0.0 and 0.0" each wheel/tire, helped him hand tighten the lugs so to reduce the beating from the air gun.

I hadn't researched the pressure so when he asked, I defaulted to "factory specs." So he set them at 36.

Then comes the test drive. From the stock Bridgestone Dueler's, there was a natural (and expected) step back in ride quality, but it was more than I had anticipated. Not sure if it's the lighter wheels, stiffer sidewalls, but the ride in stoplight traffic was worse, but not totally unacceptable.

Then comes the highway drive. The ride was absolute garbage. I was sooooo incredibly upset. It almost felt like the wheels weren't balanced at all. Terrible vibrations and harmonics.

After researching (this thread) I decided to up the tire pressure and it solved 90% of the issue.

For whatever reason, with TRD wheels and the suspension settings, my K02's did NOT like 36psi at ALL.

The ride before was so bad I thought I'd go and get them rebalanced if maybe the other machine just was off or not calibrated correctly.

Long story endless, it seems like on a newer TRD Off Road with TRD wheels, anything less than 40psi creates some really conflicting and harsh harmonics that make the ride absolutely unacceptable. Which was really disappointing coming from an SR5 with stock wheels and BFG Rugged Terrains that rode beautifully.

Just another data point for others who might be running a similar setup.

I am having issues with mine too, same 265s on TRD Pro wheels. I watched them balance the tires the first time perfectly. Rode perfectly fine that day.
The next day, they rode like garbage and I took them back in. 3 out of 4 were out and watched them balance them again. Rode perfectly fine again that day and they're feeling like garbage again. I will be checking my pressures first thing in the morning and making some adjustments to see if there are any improvements.