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Learned this along time ago from Smokey Wren and works very well with tire wear and payload concerns. Take your max PSI rating and the max load rating listed on your side wall. I'll use my new tires (for example) which are 37x13.3x18's with a max load of 3520lbs @ 50psi. My truck empty with no load weighs 8500lbs. 5000 lbs. up front and 3500lbs. in the rear. I used my local Flying J scales to get exact numbers.
I divide 50psi into max load 3520 which equals 70.4lbs per square inch. So each 1lb of air yields 70.4lbs of support. I take my rear weight at 3500lbs and divide 70.4 into that number. The total is 49.71psi. I have two tires in the back, so i divide 49.71 by two which is 24.85 or lets just say 25psi in each of the rear tires. Moving on to the front which is supporting 5000lbs so I divide 70.4 into 5000lbs which equals 71.02 and then divide that by two for each front tire. That equals 35.5. So with the current weight of the truck I run 35psi up front and 25psi in the rears. The tires are perfectly flat with the chalk test and you get a good contact patch with the correct psi for supporting the truck's weight.
If you added weight to the front with a replacement bumper or weight to the rear with a load or trailer, you recalculate using the same formula with your new weights/load. I have used this on all my trucks for years and have had excellent, even wear with the best ride.
Just my two cents but works and is exact for supporting the loads you are carrying.
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2012 F-350 King Ranch