Quote:
Originally Posted by wrighfr58
I think the tire pressure is different for the front and back. 50 Psi in the front and 80 PSI in the rear
Can any other F250 owner confirm?
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Read your door on the Ford F Series they list fully load tire pressure
Most newer F 350 series This would be 65 Front and 80 Rear
If you run 80 In the rear empty you will cut your tire tread life by half
The correct way to figure out your tire pressure is the following
1) Never Exceed the max on the tire - If you have Load Range D 65 psi tire do not do not put 80 psi - get the correct tire.
2) Get a tire Load inflation table for your tire and size
3) Weigh the truck Loaded and Unloaded
* Loaded on a cat scale Get a front axle weight and rear axle weight and a trailer weight divide each by two and apply pressure as in the chart
*Unloaded as you drive it daily get a front and rear axle weight and divide each by 2 and apply as in the chart.
4) Pressure set always at cold ambient temp use a good accurate gauge
Toyo offers this reference guide great reading
http://toyotires.com/tire-care-safet...flation-tables
Example
LT285/70R17 126S E/10 33X11.5R17
@35 2105
@40 2315
@45 2510
@50 2755
@55 2890 Load C
@60 3070
@65 3195 Load D
@70 3415
@75 3525
@80 3750 Load E
Just an example not real numbers loaded
So assuming this tire is on our truck and the front weight is 5000 lbs and rear is 7000 lbs this would give you 2500 Front and 3500 rear per tire
Or 45psi front and 75 psi rear
But you must also factor in solid front axle with lower tire pressure = Death wobble. SO in my recommendation never go below 60psi front to avoid death wobble.
Running your tires at Door sticker rating while empty will give a harsher ride and increased tire wear. Running to low psi death wobble and side wall failures.
Never load your truck without adding air to at least the minimum for the weight in that particular tire.
Hope this helps