F450 tire pressures

[guardrail22]

F450 guys - what air pressures do you run in the tires when you are NOT loaded or towing.

I have the continentals with G rating and they are rated at 110psi

[JESSE 1]

I'm running 80 psi on the fronts and have dropped to 60 psi on the rears. Trying to lower the rear pressure until I have tread contact across the entire tire. Probably will bump rear pressure back up to 80 when I hook up the trailer.

[guardrail22]

geez - like looking in a mirror

[JESSE 1]

Just wish the KR had the billet grill like your truck has.

[PowerStrokeHD]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JESSE 1</div><div class="ubbcode-body">I'm running 80 psi on the fronts and have dropped to 60 psi on the rears. Trying to lower the rear pressure until I have tread contact across the entire tire. Probably will bump rear pressure back up to 80 when I hook up the trailer. </div></div>

The F-450 tires have a MINIMUM pressure requirement of 70 psi and should never be run below that. With the high weight capacity of the tires and lack of weight while running empty, it will be nearly impossible to obtain complete contact across the entire tread of the tire with out going below the tires minimum pressure.

[JESSE 1]

That's good to know. I'll bump the pressure back up.

[SmokeyWren]

Find a load/inflation table for that size tires, then go by that.

For example, the following is the load/inflation table from the Michelin Truck website. It's a bit different than most other load/inflation tables because it gives axle weight and not simply the weight on each tire.
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" style="height: 150px;"><pre>LT225/70R19.5G

Max load Max load
on rear on front
axle axle
---- -------- --------
65 10,400 5,510
70 10,880 5,790
75 11,440 6,080
80 1,2000 6,390
85 1,2460 6,630
90 1,2980 6,900
95 1,3660 7,280
100 13,960 7,430
105 14,460 7,690
110 15,000 7,940
</pre></div></div>

So go to a CAT scale and get the weight on your front and rear axles. You'll probably weigh less than 10,400 on the rear axle and 5,510 on the front axle when "unloaded", so you'll need 65 PSI front and rear.

When loaded for bear but not overloaded, you'll probably not need more than about 70 front and maybe 75 rear.

65 PSI is the minimum for that size tire, so don't inflate to less than 65 PSI, regardless of how light you are on an axle.

[exoval]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: PowerStrokeHD</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JESSE 1</div><div class="ubbcode-body">I'm running 80 psi on the fronts and have dropped to 60 psi on the rears. Trying to lower the rear pressure until I have tread contact across the entire tire. Probably will bump rear pressure back up to 80 when I hook up the trailer. </div></div>

The F-450 tires have a MINIMUM pressure requirement of 70 psi and should never be run below that. With the high weight capacity of the tires and lack of weight while running empty, it will be nearly impossible to obtain complete contact across the entire tread of the tire with out going below the tires minimum pressure. </div></div>

If that the case wont the center of the tires wear out before the shoulders do?
&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; Not good for tire managenent&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;

[SmokeyWren]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: PowerStrokeHD</div><div class="ubbcode-body">The F-450 tires have a MINIMUM pressure requirement of 70 psi and should never be run below that. </div></div>

Close. But no cigar. Michelin and other tire makers say 65 PSI is the minimum.

[PowerStrokeHD]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SmokeyWren</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: PowerStrokeHD</div><div class="ubbcode-body">The F-450 tires have a MINIMUM pressure requirement of 70 psi and should never be run below that. </div></div>

Close. But no cigar. Michelin and other tire makers all say 65 PSI is the minimum. </div></div>

This is the load/inflation table that was provided by Continental for 225/70R19.5G. Numbers work out the same as yours, but Continental said 70 psi is minimum? [img]/forums/images/%%GRAEMLIN_URL%%/confused.gif[/img]

Single use - per tire...

70 psi - 2895 lbs.
75 psi - 3040 lbs.
80 psi - 3195 lbs.
85 psi - 3315 lbs.
90 psi - 3450 lbs.
95 psi - 3640 lbs.
100 psi - 3715 lbs.
105 psi - 3845 lbs.
110 psi - 3970 lbs.

Dual use - per tire...

70 psi - 2720 lbs.
75 psi - 2860 lbs.
80 psi - 3000 lbs.
85 psi - 3115 lbs.
90 psi - 3245 lbs.
95 psi - 3415 lbs.
100 psi - 3490 lbs.
105 psi - 3615 lbs.
110 psi - 3750 lbs.

[guardrail22]

weight ticket on way home showed 5200 front, 3900 rear and I'm down to 70psi all around. Looks like the fronts should be at about 5psi higher

[the BlueCrew PSD]

My truck came with 90# in all 6 tires. haven't towed the trialer very far, but it rides nice with or without the trailer. i plan on leaving it that way. I'll weigh the rig with the trailer in the spring to determine my true TP requirements when towing.

[EDAZS]

What about fuel mileage? Any difference between 70 and max pressure?

[EDAZS]

Anyone?

[guardrail22]

haven't had time to check but will be driving to Richmnd this weekend running 75 in front and 70 is rears