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Old 04-20-2010, 06:28 PM   #11
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Join Date: Oct 2007
Location: Tulsa
Posts: 309
The other numbers to look at are the chassis specs. I run 85 in the front and 90 in the rear. The front of my 2007 F53 is spec'd to handle 7,500 lbs out of the 22,000 GVWR.

https://www.fleet.ford.com/truckbbas...essd_07mhc.pdf

The XRV tire chart pegs 85psi at 3950 per tire, so I'm actually over by 400 lbs.

90 psi in the front would put me over by ~700 lbs and for me that's overinflated.

90 psi in the back (given dualies) gives me 15,060 lbs. The chassis is set up to put 14,500 of the 22,000 in the rear.

So in the rear I'm over by 560.

So I could weigh it all the time and putter around with the pressure to get it just right, but I assume that the weight isn't even and so I leave them over a little bit and don't worry about it. I would rather be a little over than under.
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