Hey guy's checked my tire pressure the other day....and i only had 35 psi in each tire i looked inside the door and ford say's 65 psi cold....what pressure are yall running?....I ramped mine up to 45 psi yesterday for now til i get a guage that goes up past 50 lol.....Apparently last time i got tires rotated the guy put 35 pound in so i been riding around for a few months with 30 pound less than what is specified...is that dangerous?.....


oh and btw how often are you guy's doing tire rotations...every other oil change? or longer?

 

I had a guy at michelin and ford both tell me to stick with the 55/70. My fronts seem alittle low but i will take ther advice as i have had no issues so far...i rotate every oil change...Tires are to expensive for me...

 

I run 65 front and back. I've rotated once in 50k. Aside from some wear on the tread shoulder on the fronts (now rears) they don't look the worse for wear. I know, you should rotate more often, but I still have the stock contricraps and so I'm not really trying to make them last.

 

What do you mean by 55/70?

 

55 front and 70 rear..Sounds like a bad combo but the michelin rep and ford dealer both told me the same thing so ill stick with it....I just put these 285 ltx at one about 5k ago and we will see how well it works..

 

I tend to run 55 all around - except when carrying a load. Rarely carry one anymore - in town truck

 

60 front 50 rear, unloaded for driving the windey mountain roads that I live and work in. It keeps the shoulders from wearing prematurely.

I add rear or front air pressure as needed, depending on what load I am carrying.

 

The thing is, you need the amount of air in them required to carry the amount of weight you have on them. Since it's a truck, that can change, a LOT.

My tag says 55/70. So my reasoning goes like this. The ratings are the amount of air required to carry the maximum amount of weight that the axle CAN carry when the truck is loaded to the maximum. That is an assumption on my part, but I think it's a pretty good one.

So, my front axle is probably pretty near maximum, because of the engine. My rear axle is normally much lighter than the front axle, so I go with 55-60 in the front and rear. If I add weight, I add air up to the maximum of 80 psi.

There does exist this thing called a tire inflation table. They differ depending on the make and the size of the tire. Most tire stores can provide these to you, if they have a clue as to what they are. Basically, they say for x amount of weight you need x amount of air. Pretty simple if you live near a scale.

Another method is the chalk method. Draw a chalk like across the face of the tire, roll a few times and see if the chalk line is worn evenly across the face of the tire. If it is, the face of the tire is flat to the ground and the tire is at the right pressure. (You want the face of the tire to have equal weight all the way across it).

My preferred method, if you're feeling really **** about it, is the IR thermometer. The temperature across the face of the tire after driving for awhile should be even. The same in the center as both sides. If it's hotter in the center, the tire is ballooned out indicating you have too much air. If it's hotter on the edges than in the center, then then the sidewalls are pushing out, causing the center to cave up, meaning you don't have enough air.

An off topic side note, it's amazing to me how bad these things can drive if you don't have the same pressure on both sides. I use a precision digital air gauge. Dad bought tires once at a tire store and two guys worked on it, one on each side. They were obviously using crappy air gauges, because it had 90 psi on one side and 75 on the other. We could barely keep it on the road.