I agree bulla, I always run 65 in the front and 50 in the rear when Im not towing. If im towing I usually bump up the rears to 65 also.

 

Another vote for more in the front. I run 65 in the front and 60 or so in the rear. If I know I'll be towing or loading up, the rears go up accordingly. Anything more then 65 in the rear unloaded and the center's wear out way too fast. Another thing I noticed with higher rear pressure was the rear of the truck seemed to be "loose" cruising on the highway. One little bump would make the back end shimmy or bounce real bad.

 

These threads usually end arguments, especially on vehicles that require huge differences in tire pressure than what was called for by the manufacturer. Living in Ohio and hauling tires for ten years I have got to talk to a lot of people with a lot of knowledge on this. That said I can give a few tips on pressure, I will not list mine, because unless you have the same tire, same size, same rim, same truck, set up the same, yours will be different.

1. Running max psi to save cash doesn't. The added tire and vehicle wear more then eat the fuel savings. The lost traction and poor handling are a safety issues. Remember, the companies that recommend this not only sell tires, but most also do alignments and suspension repair.

2. Larger tires of the same load range will carry the same load at a lower psi.

3. Rims will effect needed pressure. Rims also have a max load and psi that is often overlooked.

The best way to determine needed pressure is to draw a line across the the tread with chalk and drive in a straight line. Check the line and adjust pressure until the line wears off evenly across the tread. You may end up with 4 different pressures. Use the lowest pressure on each axle as the pressure for that axle. If you are worried the pressure may be to low try to find a tire load chart for your tire. It will say what load can safely be carried at a giving pressure.

I have a light wheeling vehicle with large tires that has been running 12psi front, 10 rear for street pressures for the last 3 years. 6 psi all around off road. I'm constantly told how unsafe this is and I offer these people the chance to drive it down the road at my pressure then try theirs. Two people have took me up it. One went to 35psi, the other the tire max of 45. Both went to the end of the road with my pressures and both turned around with in sight at their pressure's. Reason being, at 20 psi these tires have less than 2 inches of tire in contact with the ground. The resulting squirrel on crack handling (and a thing called self preservation) changes even the most stubborn persons mind very quickly.
The comment is always along the lines of "that don't seem right".

 

I'am with jmatthews on this one. I run 55 in fronts and 60 in rears. Any more and it seems like the centers wear quicker.

 

Nice read kawcrasher! I'm curious now at what pressure my rear tires would actually be at to get even tire wear!

 

Are you all running tires with "LT" on them?

 

bulla, Have you ever experianced odd tire wear on your fronts? my L99 F350 CC Long Bed Dually wears a weird pattern on the outside edges-if I rub my hand towards the back of the truck over the tread it feels "sharp" seems to be on both tires and just the inside and outside edges, smooth if I rub towards the front.
Also, I run my rears at 45 psi and STILL don't have ALL the rubber on the ground. I run my truck empty 85% of the time and do not carry or haul very heavy loads when I do.
I suggest the chalk test to you: just start with a known psi in all tires then put a line across the tread, then drive around the block and take a look at your line-you'll be able to see some chalk still there where the rubber is not touching the road and adjust acordingly and re-test until you find a good psi for you.

 

I have a 2002 F350 SRW 4x4, factory rims, stock tires. Calls for 55 front/70 rear on fuel door. That's what I run.

 

I get that on my front tires too. Its called heel and toe wear. I'm trying to find a good article on it.

EDIT:
http://www.bridgestonetrucktires.com...7v2i3drive.asp Last picture on the page
http://www.kaltire.com/index.php?pag...ear-conditions Look for "heel/toe wear" title. Nice page on tire wear including pictures.

 

I was runnin 70 in the front and then bumped it up to 75 last weekend , now the truck seems to wonder on the road abit . I'm running 60 in the rears now , bumped it up from 55 because I was loosing to much fuel mileage . The rear tires seemed to have to much sidewall bulge at 55 psi too .

 

65 on my 250 4door 4x4

 

I have the same problem with my drw tires wearing faster in middle of tire. I run 70psi in the front and 60psi no load and 75-80psi depending on load on my drw. But the narrow stock rim the center of the tire is the only thing touching the road. So I am going to drop to 50 maybe even 45psi with no load to see if I can get it ride on the outer part of the tire / ride flat. For even wear. And I am only running 235/85R16 BF Goodrich Commercial TA Traction. What size are you running on your dually ?

 

I have a 2002 F350 crewcab longbed 4x4 and the sticker on the drivers door says 55 front and 80 rear, so thats what I run loaded or unloaded. My tires wear evenly across the whole tread and I rotate them every 6K.

 

That spec for 80 in the rear is when the axle is loaded to capacity.

 

robbragiel,

You are 100% correct. My fuel door also says 55 front/80 rear as yours. Thanks for the correction. I keep my rear tires at 70 when empty and 80 if I am carrying something heavy. I rotate my tires each 5000 mile oil change. The rotation is free at the tire center as a tire pkg purchase.