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I am running the Lariat 18" wheels with 275/70/18s. The tire label on my fuel door says 55PSI front for the stock 265s. This seems a bit soft to me and the tires have a slight bulge at the bottom. With bigger than stock tires I am not sure if the inflation needs to be adjusted higher than the label. I also wonder if Ford used that same pressure recommendation on all the F250/350 trucks regardless of gas or diesel, 4x4, crew cab etc. Trying to obtain load and inflation tables for my tires but it's not easy to find them. What do you think?
In the Jeeping community we run chauk tests to determine the proper air pressure. Get a stick of sidewalk chauk draw several lines across the tire, drive in a straight line several hundred feet. If the chauk wears off in the middle first too much air, if the chauk wears off on the outer edges typically not enough air. And the sidewall should give you references for load and psi.
As mentioned, check your sidewalls. They will provide some guidance on max load and pressure. Just use that as a guide. If you run loaded most of the time, be towards the upper end of the scale. If running unloaded you can back off some. The chalk method is a indicator as well. Just ensure if you do it, you account for any usual loads
Lariat 18" wheels? My lariat came with 16", even the door sticker says so
Also says 55 front 65 rear
The ones that fit our trucks were only available near the end of the 2004 production year. You could get Lariat, King Ranch or Harley 18" wheels with the proper offset for our trucks. It all changed in 2005. I got a set on ebay.
I’m on stock sized tires and stock 16” wheels on my 2000. My sticker says 50 front 80 rear. I run 75-80 front and 50 rear if I’m unloaded. The front still doesn’t seem like enough looking at my tread wear. I lowered the rear empty after i wore out a set of brand new A/T in around 28k running the recommended pressure and it seems to wear better now and ride better
FWIW, my dually says 45 psi for the rears. The tire store that balanced them had them at 65 and it was wearing the center only.
You must have an early '99??
MY LATE '99 says 60 all around....
I CAN'T run 60 in my rears or they will wear in the center
I believe that the EARLY '99s are 60 front and 45 rear and that's what I run in MY LATE '99s tires
I have danced this dance until I wore my legs off. Every brand/model of tires behaves differently on these trucks. The tires available in '99 to '03 are not on the shelf, and the condition of the truck on the lot in '99 to '03 doesn't exist. Add to the mix your maintenance habits and the competence of the alignment guy, and you won't find a label on anything that suggests a pressure that will work for sure. My friends with the chalk advice have given you the best option for your situation. My truck used to eat front tires for breakfast unless I had the front set to 65 PSI. Now that I've done the front end work and bought Michelins, the air pressure isn't as critical - and the front tires are far outlasting the rear (too much power). I have 50K miles on my tires without a single rotation, and the front tires are just as straight as the day they were installed.
Thanks for all the great replies. I will get some chalk for sure. Meanwhile I was surprised to learn my truck is at 8,860 LBS with camper shell, some tools, full tank and two passengers. 5,080 of that is on the front axle and 3,780 on the rear. Following the load and inflation chart 2,540 LBS (one half the front axle weight) puts the fronts in the 55 PSI bracket and adding 10% to that (recommended for day to day load variation, side to side variation and normal air losses) puts it in the 60 PSI bracket which is about where I thought they should be.. A real eye opener is my total GVWR is only 9,900 which means I only have 1,040 LBS to play with and we haven't even hooked up a TT yet, or the extra stuff that will go in the back end for camping. Easy to see how people can easily exceed their payload in a 1/2 ton. Course the extra weight of the crew cab, long bed and 4X4 cuts into the payload
seriously
"A real eye opener is my total GVWR is only 9,900 which means I only have 1,040 LBS to play with and we haven't even hooked up a TT yet"
The director of operations where I used to work about had a conniption when he discovered/learned that the F-350's that we used were overloaded and in DMV violation when a utility box was installed on them. And that was without anything in the box/bins.
The director of operations where I used to work about had a conniption when he discovered/learned that the F-350's that we used were overloaded and in DMV violation when a utility box was installed on them. And that was without anything in the box/bins.
Yeah.. the label reader must have missed his coffee that morning.
Another eye opener.....my front axle GAWR is 5,200 LBS and I am sitting at 5,080! This means even a Ranch Hand bumper with a winch could put me over!! Or giant tires! I was thinking of putting something up there in case of a deer...or moose.
Realizing it’s the official numbers and you shouldn’t go over legally, isn’t the capacity much more than 5200? They sell springs rated to 6k and more I believe, after all snow plows ain’t light but they’re mounted on many super dutys.
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