The factory tire pressure on 18" stock Lariat Screw is 35 psi. I increased to 40 psi and my truck rides so much smoother. IS there any problem with increasing 5 psi?? Also, what is difference between cold and hot tire pressure in psi?? Thanks

 

And which brand of tires do you have on your truck?

 

These are stock Long Trail for Lariat screw 2005....

 

If tire pressure is too high, then less of the tire touches the ground. As a consequence, your car will bounce around on the road. And when your tires are bouncing instead of firmly planted on the road, traction suffers and so do your stopping distances. You’ll also feel a decrease in ride comfort.

You should also check your tire pressure after the tires have been sitting for a couple of hours. Now that the weather is turning cold in most areas it's important to check tire pressure because for every 10 degrees the temp drops your tires will lose about 1 psi.

Also radial tires can be decieving when looking at them. A tire can be 10 pounds +/- and of recommended pressure and not look any different.

 

You are probably over inflated 2005f150. The stock tires are P rated (passenger car) tires and the max inflation limit on the sidewall is 35 PSI. I would think you'd run the risk of blowing one out on a big pothole etc. In addition they will probably wear more in the middle as someone else stated. I always thought it was kind of funny that Ford puts a car tire on these trucks and then recommends that we run it at the max pressure for the tire, not much margin for error there. Best bet is go to LT rated tires on these heavy monsters. Just my .02

 

Hmm, my 05 Screw Lariat with stock 18 inch and LT Goodyear AT/S says on the door jamb that it should be set to 40 PSI for front and back, so I don't think you will have any issues.

 

Thats interesting. His truck must be a 4x2 if it has long trails on it. My 4x4 came with BFG rugged trails (P275-65-18) and they said 35psi max on the sidewall. Maybe the Goodyears are rated higher?

 

This is exactly why my first responce was what brand of tires do you have. He answered BFG Long Trails which are rated for a max of 35 PSI.

 

I think I have the General Ameritrack tires on my 05 supercrew 4x4 with 17" rims. I put air in them this morning. The door said 35 and the tires said 45 I believe. I went with 35.

 

The tires are BFG Long Trail T/A 18" P rated that come stock on the Lariat Screw. The sidewall says 35psi max as does the sticker on the door. The tires look so much better and ride better at 40psi which is why I ask is this ok?

 

I have the same tire and did the same thing 38-40 psi, 35 IMO has a "deflated" look to it, and is sloppy feeling around corners. 38-40 feels much better.

 

Again when you drive on a tire that is over inflated you run the risk of a couple of problems:

1. A much greater chance of a blow out. BFG says 35 psi because they have tested the tire and know its limits.

2. You will have less tire contacting the road which is bad for traction.

3. You will increase the wear drastically in the center of the tire because of the extra weight/pressure in the middle.

Call a tire store if you want the truth. Just because the Goodyear can run at 40 does not mean your BFG should.

 

I run mine at 42 PSI, that has been the sweetspot for me on the Goodyear AT/S tires.