How to figure out tire pressures for your truck

[Mopar1973Man]

Ok Gang.

I got another one to share with you. How about figuring out how much air to put in your tires. There is a really easy math formula for this...

(Axle Weight / 2) / Tire Capacity) x Tire Max PSI = Inflate Pressure

So to give you an example... Here will be my scale weights for my truck.

Front Axle - 4,400#
Rear Axle - 2,980#
Typical Load Range E - 3,042# @ 85 PSI

So doing my front axle...

4,400 / 2 = 2,200 / 3,042 = 0.72 x 85 = 61 PSI

Now the rear axle...

2,980 / 2 = 1,490 / 3,042 = 0.48 x 85 = 40 PSI

So now let look at GAWR and redo again...

Front axle weight at GAWR (5,200#)

5,200 / 2 = 2,600 / 3,042 = 0.85 x 85 = 72 PSI

Rear Axle weight at GAWR (6,084#)

6,084 / 2 = 3,042 / 3,042 = 1.0 x 85 = 85 PSI

So at GAWR of my truck I would inflate to 72 PSI in the front and 85 PSI in the rear. Funny how load range E'***** the mark exactly. Then my unloaded truck would be 61 PSI front and 40 PSI in the rear for a nice ride. You can adjust these figures a bit but never exceed the tires max pressure or the tire max weight limit. Rather being safe than sorry.

 

[artm8g28]

Just want to thank you for the info--- where exactly did you find this formula??