minimum tire pressure for non towing.

[peaeye1]

This question is on a 2016 F350 superduty Dually. The tires are LT245/75R17E Goodyear,s.Due to the stiff suspension, I would like to reduce the tire pressure to a safe, but more comfortable ride.when not towing. I run 65 rear and 75 front.per Ford's recommendation's when towing.I have looked for a load chart for these tires, but have had no luck.The truck weighs out at 5260 front, and 4280 back.I have a aux tank and carry extra fuel. I will be making a non towing run of about 1300 miles in a few days and would like some info on the minimum PSI I could safely run in these tires on this upcoming trip.

Thanks

[SoCalDesertRid1]

With a diesel, 65 front and 45 rear is quite safe unloaded. Could go as low as 50 front and 35 rear, but that's pushing it, in my opinion.

[Grit_dog]

slides wrote:
I dropped my rears down to 65psi on my 2012 F350 are and the tire sensor went off talked to truck tech and was told that was Fords recommended and I would have to get them to reprogram.... They said not happening??

I had my '13 F250 tpms thresholds re programmed as well as '14 Ram 2500.
Read on Cumminsforum now that FCAs Witech software has been updated and no longer allows for changing the factory pressure thresholds. May have been a federal mandate and now Ford is the same?
Was hard to find dealers who would do this. But talked to a tire shop that does a lot of aftermarket pickup big tires and wheels and they pointed me to a friendly dealer who did their trucks.
This really is an annoyance/problem for those with newer 3/4 tons that actually run the right pressure for the conditions.

[Grit_dog]

The Mad Norsky wrote:
Assuming you have the 6.7L diesel in that truck, the fronts are almost untouchable for tire pressure.

I previously owned the 2011 model of your truck, with same sized tires (LT245/75R17's) and was running fronts at 55 PSI, as that is where they were at when I bought the truck new. Well, after bad wear, cupping, and sometimes death wobble problems, I upped the fronts to the 75 PSI area and viola! All the problems went away.

So, as I said, fronts equal untouchable. That diesel engine is HEAVY!

Rears, drop them down to where you feel comfortable. 50 PSI would not be a problem there in an unloaded situation.

Good point. That diesel is heavy for the little 245s. I run about 55 psi front in my 250 gasser. 20kmi no rotations yet and just a little outside tread feathering going on.

[peaeye1]

KKELLER14K wrote:
Open the drivers door and look for the build placard.. a sticker that gives you weights and tire info. Now I'm not a tire expert but what is on the tires themselves is MAX pressures cold carrying a load. I always use Max pressures when hauling a load that is branded on the tire itself. Being a Dually the rears are even more tough to get to.. right?...that inside tire valve is a pain to get to. But where I'm going with this is....I run mine at MAX psi when loaded as branded on the tire then I air them down to those posted on the placard for normal use. So say your running 80psi (as mine are branded) max load with the RV but the placard says 65 front and 50 rear respectively unloaded. So you have a new truck with the stock tires... that answer is right there on the sticker unloaded and on the tire as max loaded. Now if your running e rated tires, which a Dually should have, I would not run them at max unloaded which is what your asking. The ride is terrible..air them down to the posted sticker...at least that's what I do...good luck!
Where did you find this "FORD" recommended tire pressure for towing at?

I referenced Fords recommendation because that's what is on the door sticker. I mentioned that I was not going to be towing and wanted a lower PSI if possible when UNLOADED. I know what the max PSI is for towing, that was not the question.Please reference the original post

[3oaks]

DutchmenSport wrote:
.................... Funny, in 15 years of duly ownership now (3 of them now), I must be doing something right, I've never had to replace a tire on any of my trucks.

Maybe yes, maybe no. Years of ownership doesn't mean much. Now, mileage driven on a set of tires would mean something.

I had an uncle who got 18 years on the original tires.
Drove his new car for two years and never drove it again. It sat in an old barn for 16 years gathering dust and rodents. :R

[peaeye1]

ChooChooMan74 wrote:
You can use a tire inflation chart. Estimate what your truck weights empty, and go from there. For your size tire, this is what it says (note, all charts are an industry standard)

LT245/75R17 Single
35 PSI = 1770 Lbs
40 PSI = 1945 Lbs
45 PSI = 2110 Lbs
50 PSI = 2270 Lbs
55 PSI = 2430 Lbs
60 PSI = 2580 Lbs
65 PSI = 2755 Lbs
70 PSI = 2875 Lbs
75 PSI = 3020 Lbs
80 PSI = 3195 Lbs

LT245/75R17 Dual
35 PSI = 1610 Lbs
40 PSI = 1770 Lbs
45 PSI = 1920 Lbs
50 PSI = 2040 Lbs
55 PSI = 2210 Lbs
60 PSI = 2350 Lbs
65 PSI = 2535 Lbs
70 PSI = 2615 Lbs
75 PSI = 2750 Lbs
80 PSI = 2910 Lbs

This is what I could not find, the specific tire chart.This info gets me where i need to be.

Thanks

[Me_Again]

35 pounds in a dually empty will improve ride a lot. On RAM 3500's the tire pressure indicator system does not alarm. Chris

[DutchmenSport]

Chevy guy here. I never mess with my tire pressure. I let my mechanic do all those checks when I get my oil changes. I make sure he knows I tow a trailer. Ehhh! So the ride is a little bouncy when I'm not towing???? It keeps the mother-in-law from wanting to hitch a ride with me! 🙂 Funny, in 15 years of duly ownership now (3 of them now), I must be doing something right, I've never had to replace a tire on any of my trucks.

[slides]

I dropped my rears down to 65psi on my 2012 F350 are and the tire sensor went off talked to truck tech and was told that was Fords recommended and I would have to get them to reprogram.... They said not happening??

[The_Mad_Norsky]

Assuming you have the 6.7L diesel in that truck, the fronts are almost untouchable for tire pressure.

I previously owned the 2011 model of your truck, with same sized tires (LT245/75R17's) and was running fronts at 55 PSI, as that is where they were at when I bought the truck new. Well, after bad wear, cupping, and sometimes death wobble problems, I upped the fronts to the 75 PSI area and viola! All the problems went away.

So, as I said, fronts equal untouchable. That diesel engine is HEAVY!

Rears, drop them down to where you feel comfortable. 50 PSI would not be a problem there in an unloaded situation.

[Grit_dog]

Bout 40 psi rear and 50psi front. Little more up front if it's a diesel.
Unloaded a run anywhere from 45-60psi front and 35-45 psi rear in my 07, roughly the same weight as you'r truck but with wider tires.

[rhagfo]

KKELLER14K wrote:
ChooChoo...So to clarify this is unloaded cold pressures? Not max loaded cold as branded on the tire itself?

ChooChooMan74 wrote:
You can use a tire inflation chart. Estimate what your truck weights empty, and go from there. For your size tire, this is what it says (note, all charts are an industry standard)

LT245/75R17 Single
35 PSI = 1770 Lbs
40 PSI = 1945 Lbs
45 PSI = 2110 Lbs
50 PSI = 2270 Lbs
55 PSI = 2430 Lbs
60 PSI = 2580 Lbs
65 PSI = 2755 Lbs
70 PSI = 2875 Lbs
75 PSI = 3020 Lbs
80 PSI = 3195 Lbs

LT245/75R17 Dual
35 PSI = 1610 Lbs
40 PSI = 1770 Lbs
45 PSI = 1920 Lbs
50 PSI = 2040 Lbs
55 PSI = 2210 Lbs
60 PSI = 2350 Lbs
65 PSI = 2535 Lbs
70 PSI = 2615 Lbs
75 PSI = 2750 Lbs
80 PSI = 2910 Lbs

The inflation chart above is what each tire will carry at that psi.
So if your empty rear axle weight is 3,500#.
3,500/4=875# carried by each tire, so likely start at 40 psi, and do a tape test or chalk test.

[johntank]

This is for my 07 Ram 3500 running LT235/80/17E unloaded is 65psi front and 45psi for the rear duals, not same size tires you have but might give a starting point to go by, if tire place card on your Ford door post does not give a unloaded tire pressure to use.

[KKELLER14K]

ChooChoo...So to clarify this is unloaded cold pressures? Not max loaded cold as branded on the tire itself? What's the chart for 16 inch? Where can I find that?

[ChooChooMan74]

You can use a tire inflation chart. Estimate what your truck weights empty, and go from there. For your size tire, this is what it says (note, all charts are an industry standard)

LT245/75R17 Single
35 PSI = 1770 Lbs
40 PSI = 1945 Lbs
45 PSI = 2110 Lbs
50 PSI = 2270 Lbs
55 PSI = 2430 Lbs
60 PSI = 2580 Lbs
65 PSI = 2755 Lbs
70 PSI = 2875 Lbs
75 PSI = 3020 Lbs
80 PSI = 3195 Lbs

LT245/75R17 Dual
35 PSI = 1610 Lbs
40 PSI = 1770 Lbs
45 PSI = 1920 Lbs
50 PSI = 2040 Lbs
55 PSI = 2210 Lbs
60 PSI = 2350 Lbs
65 PSI = 2535 Lbs
70 PSI = 2615 Lbs
75 PSI = 2750 Lbs
80 PSI = 2910 Lbs