Recommended tire pressure for 35" D-Tracs?

[98 SNAKE EATER]

On my old BFG 305/70/16's for both the KM and KM2's, I contacted BFG, gave them my GVWR along with a list of added accessory weight at the time and they suggested using 43-45psi for local driving and 50psi Max for long distance highway driving

I was able to get 120k out of the KM's and a little over 100k out of the KM2's

Now that I've stepped to 315/75/16 Goodyear Duratracs, I contacted Goodyear and asked them the same thing

Here was their response:

Sent by: Goodyear Tire & Rubber Company Consumer Relations 728 1144 East
Market Street Akron, OH 44316 Voice #: 800.321.2136 Fax #:
330.796.6829

Hi Mr Antonio,

Thank you for contacting our web site and for your concern about tire
safety. Your original equipment P275/70R16 tires will each carry 2480 @
32PSI.

Your LT 315/75R16 DuraTracs will carry 2535 @35PSI,
2715@40PSI
2950@45 PSI
3195@50 PSI

Since you are carrying extra weight, it might be a good idea to weigh your
Land Cruiser fully loaded to see what you are carrying so that you can
adjust your air pressure accordingly.

Barbara
Consumer Relations

Now, I have yet to actually weight my rig, but it's definitely on the heavy side (loaded full rack, plate bull bar front bumper, dual swing outs, front and rear winches, dual batteries, sub enclosures, tools, etc., etc.), but going by what you see, what do you suggest for both daily driving and long distance highway use?

 

[djsixbillion]

Mine is probably pretty similar weight-wise, maybe a bit heavier in the rear when the aux tank is full. I usually run 45 psi on the pavement in my 315/75 Duratrac's and it seems to work well.

 

[scottryana]

I run mine at 35psi, smoother ride, and still well with in their load capacity. @35psi you are good for a 10,000lb truck, I am not saying there isn't an 80 that heavy but I have yet to see one. You could always air up to 45psi for your long trips but I find the 80 much more comfortable at 35, I will take the 1/5 of an MPG penalty on a truck that already gets terrible gas mileage.

 

[98 SNAKE EATER]

Thanks guys

I'm not too concerned about ride quality as they already feel 100 times better than my KM2's

I'm more concerned about long term wear

I just dropped $1300 bucks on these things and don't want to do that again for another 100,000 miles if I can help it

 

[Delancy]

10,000lb truck, I am not saying there isn't an 80 that heavy but I have yet to see one.

If there's a 10k 80 out there, then there may be validity to Christo's concern for bus loads of nuns.

My F350 6.0L curb weight is 7600, GVWR 9900, and can't imagine an LC weighing in even close, from a safety perspective, be it 35psi or 90psi 12 plys.

 

[Wheelingnoob]

I run mine at 40psi truck weighs 5800lbs unloaded.

 

[scottryana]

Haha thanks Delancy, I was using that as a way to express how they are way overkill even at the lowest PSI.

 

[arndog123]

I run 'em at 40 psi on both 80's.

 

[mr jits]

I ran mine @ 42psi. With all the typical junk I carried and armor I was just under 6k.

 

[mr jits]

I'm also now fully convinced that you really enjoy taking photos of your truck.

 

[Dazrin]

Thanks guys

I'm not too concerned about ride quality as they already feel 100 times better than my KM2's

I'm more concerned about long term wear

I just dropped $1300 bucks on these things and don't want to do that again for another 100,000 miles if I can help it

I would love to see that happen, but I would expect you to get less miles out of these than the KM2s, probably significantly less. Of course, getting 100,000 out of a KM2 is also an unlikely scenario, so if anyone can do it, it sounds like you can.

I would suggest doing the chalk test and dialing in the highest pressure that gives you a good contact patch for your specific rig.

 

[Delancy]

Haha thanks Delancy, I was using that as a way to express how they are way overkill even at the lowest PSI.

I was using merely to impart a smidgen of humor, considering I had just read another post by Christo with the nunnage talk.

Maybe Freudian fetish, but he's awfully concerned about nuns and mass transportation. Hahahahaha. ( joking, obviously).

Have run 35psi on the FJC's KM2s for 50k.

Ran 32psi on the 80 KM2s.

Tried 35,32,30, now 28psi on the Krawlers, which will see less miles, and may try 25, as they're still a little rough.

 

[Stevesnj]

I have 285 DT's and run them at 42 all around.

 

[neal0124]

My truck weighs 5700lbs on a certified scale with a full tank. I only have a rear bumper so far. I'm running 285 DT's and run them at 38 psi. I've had them on for about 10k miles and they look brand new.

 

[98 SNAKE EATER]

So this morning I must have run over some road kill cause I found a bone sticking out of my right rear D-Trac

What really sucks is that I had just completed my 5th short mile tire rotation and was all set to start pushing the intervals to 3k miles, but now I gotta start all over again

 

[98 SNAKE EATER]

OK, got the new tire installed and the old one will be repaired with a plug patch and set aside as a spare for my off-road trailer

Some bits and pieces that were left inside

 

[beachcomberspi]

Ouch! I've heard about bones piercing tires but never had seen it.

 

[PIG PUNISHER]

You think that would've punctured a KM2?

 

[98 SNAKE EATER]

You think that would've punctured a KM2?

As sharp as it was, I'd say it would've gone through anything

 

[landroamer]

there is a math formula that tends to give you a lower run psi for the us. here is an example: weight of the rig X max psi on tire(4000x80=320,000). Then max load for one tire X 4(3415x4=13,660). Then (320,000 / 13,660 = 23 psi).

Have you done a chalk test. there is actually an article in the may/june issue of 4wd Toyota owner magazine on page 31 with the math formula's and how to perform the chalk test. It should give you even tread wear and fuel efficiency. you might try this.