Interesting - KO2 Tire Pressure per BFG site

[Jivewalker]

Sorry if this was already posted. I've been reading the tire pressure threads, well a lot of them, and I decided to go to the BF Goodrich site and was surprised by the disclaimer right on the page for my stock tire size. It says clearly that I need to raise my inflation pressure to 44psi. I have been running 32psi. Don't remember ever seeing this before when I bought my tires many miles ago. Check it out.

All-Terrain T/A(R) KO2 | BFGoodrich Tires

 

[Hans Moleman]

I have been running mine at 38psi. 40psi was a little harsh. I can't imagine 44psi.

 

[headpaneer]

Sorry, where did you find that tire pressure spec? Following your link, I see general information and when opening specs on the C and E versions of the 265/70-17, the tire pressure at the max. load.

 

[SoCalRunner]

This is it

 

[Jivewalker]

Sorry, where did you find that tire pressure spec? Following your link, I see general information and when opening specs on the C and E versions of the 265/70-17, the tire pressure at the max. load.

Sorry, I guess the link removes my specific vehicle info because of cookies, I guess. Like SoCalRunner posts above, after I enter the year, make, model, it gives what is pictured above.

I'm going to go up to 42 and see what happens.

 

[jhguth]

that's to match the factory load rating which takes into account more than the load of the tires but also fuel efficiency, rollover performance, etc...

you can double check their math by looking at the load rating of the factory tires (I can't remember what it was) and looking at a load-inflation table for the KO2s

i remember when i used a generic load-inflation table for the load rating my math came out to about 40psi, so 44psi from the manufacturer's own table sounds believable

anytime you change load rating on your tires your new tires will be at a different pressure than what is on the door, the rating on the door is only for OEM equivalent tires.

(i ran my C range KO2s usually 37-39psi)

 

[Gclark949]

It is because it is an LT tire. Look up the load inflation for LT.

 

[headpaneer]

This is it

Thanks!

 

[llDemonll]

It is because it is an LT tire. Look up the load inflation for LT.

this is the right answer. LT are higher PSI than normal rating

 

[jhguth]

even if you change to another P-tire with a different load rating your pressure required is going to change

 

[Jivewalker]

even if you change to another P-tire with a different load rating your pressure required is going to change

Thanks. I've had the KO2's on for about 20k now and was getting some good noise and hi lo wear on the inside of the fronts. I have been running 32-34. I took them up to 40 last night and what a difference on my commute today! So much quieter and the tires are much cooler to the touch. Ride is stiffer but that doesn't bother me at all. No more feeling like I'm riding on suction cups! wish I had known to put them up when I got them, don't think that was posted on the web site at that time.

Wonder how many consumers aren't aware of this!? There are so many differing pressures and opinions on this site, but to see it from the manufacturer really made up my mind.

 

[repo]

I run mine at 35 most of the time, or 32 if I'm driving on a lot of dirt roads.

I remember seeing a chart someone posted where the minimum you should run on the highway with E rated is about 32 psi. Any lower and they get too hot.

 

[Jivewalker]

Ok, I double checked the math. My original P dunlops were rated at 2425lbs at 32psi, then derated to 2204lbs being on the light truck (4runner). Cross that over to the TAKO2's LT chart, and 44psi makes sense, 45psi would be 2255lbs.

At 40psi now, going to give 44 a try for the hell of it. I realize everyone has done this already and this horse has been beat to death over the past 10 years, but I guess I'll see for myself and add to the validations!

 

[Grug556]

Ok, I double checked the math. My original P dunlops were rated at 2425lbs at 32psi, then derated to 2204lbs being on the light truck (4runner). Cross that over to the TAKO2's LT chart, and 44psi makes sense, 45psi would be 2255lbs.

At 40psi now, going to give 44 a try for the hell of it. I realize everyone has done this already and this horse has been beat to death over the past 10 years, but I guess I'll see for myself and add to the validations!

Ive tried 46 and 44...no good. 46 crowns and follows the ruts in the road all over the place..light and squirrely on highway.

I am currently using 40-40 for last two years. Seems about the best. Wear seems even. 40-38 also ok.

265/70/17 K02 C

 

[hwnrunner]

Im similar at 40 on 275/70/17 E. Tried 42, tried 44, ride gets very stiff for me up there. 40 seems to be the sweet spot.

 

[mteolus]

Well hell, I was running my 285 C's at 36 and was getting wear in the middle significantly, so I went down to 32. Not sure if going to 40 will help at all.

 

[Jivewalker]

Well hell, I was running my 285 C's at 36 and was getting wear in the middle significantly, so I went down to 32. Not sure if going to 40 will help at all.

Funny, I was getting inside hi lo feathering wear on the fronts and was at 32 on my 265 C's. I was also getting a lot of road noise and felt like I was driving on suction cups. I also thought I was getting some stress on the diffs and transmission, but that might just have been more tire noise. 44 was hard to swallow, but the math added up. I'm at 40 now and will run that for a while to see what happens. First impression is a better, but bumpier ride, which I'm ok with since it is a 4runner and not a luxury cruiser!

I would look at the inflation chart for the 285's, it might be different!

Heres a link: https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdf

 

[4Regrets]

FWIW, I have 275/70R17 KO2's on my 4Runner. I don't have any aftermarket parts that add weight, and I don't drive around with 400 pounds of gratuitous gear in it. For daily driving with just me as payload, I run 41 PSI up front and 38 in the rear. I find that seems to keep the rear end feeling a bit more planted on uneven/bumpy roads.

When I load up (for example, recently did a 2000 mile road trip with 3 adults and all our stuff in the car) I had them at 44 PSI all around and they felt good, were rock solid and didn't seem overly stiff/harsh. I estimate I had 800-850 pounds of payload at that time. Felt a bit harsh at 44 with just my 155 pound backside in the driver's seat.

 

[Jivewalker]

FWIW, I have 275/70R17 KO2's on my 4Runner. I don't have any aftermarket parts that add weight, and I don't drive around with 400 pounds of gratuitous gear in it. For daily driving with just me as payload, I run 41 PSI up front and 38 in the rear. I find that seems to keep the rear end feeling a bit more planted on uneven/bumpy roads.

When I load up (for example, recently did a 2000 mile road trip with 3 adults and all our stuff in the car) I had them at 44 PSI all around and they felt good, were rock solid and didn't seem overly stiff/harsh. I estimate I had 800-850 pounds of payload at that time. Felt a bit harsh at 44 with just my 155 pound backside in the driver's seat.

This all makes great sense. I noticed my tires are much cooler to the touch than they were when running 32. Here's the only caveat I see and probably why they were engineered with P tires, not LT.

I would assume that since you have to raise the pressure to get the load rating, the ride will be firmer/harsher. I then assume that the increase in harshness is transmitted to all other suspension components. So you have to ask yourself, if you are going to upgrade to LT tires, shouldn't you upgrade your suspension to handle the extra harshness? Or, do you just accept that your components will wear out quicker? Or, just stick with some burly P rated tires?

 

[ColoradoToyota]

Im similar at 40 on 275/70/17 E. Tried 42, tried 44, ride gets very stiff for me up there. 40 seems to be the sweet spot.

Ditto, same tire size and running 40 PSI feels like the sweet spot for both wear and driving comfort on pavement.