i want to be around 35 psi....but when my tires are cld(say i just got up in the morning)...what should i have them inflated to??? if i do it at 35 then when they warm up the pressure will expand correct??

Recommended tire pressures are always when the tires are cold. So when most people talk about pressures, they mean when the tires are cold. So fill them up to 34-35 when cold. They'll go up to about 38-40 on the highway.

on a street driven truck for best economy-industry standard is 35 psi....for best ride 32....for wheeling it all depends

I usually put mine at about 32-34, always around those.

I adjust it depending on the temp.

Ex.. This morning it was 18 degrees out.. it will be mid 50's today..

Last week it was about 40 in the morning.. and a high of 70 in the day.

When I know the temp is going to be warmer out for a while I decrease the amount of air in it.. so I am at 31psi up front and 35 in the rear..

Remember tire pressure changes roughly 1psi per 10 degrees.. so if you had 35psi when you were in Arizona (whenit is 40 when it is cold) and you drive to denver.. you need to add air to your tires since it will be colder in Denver)..

~Mark

Iys not the ambient temperature thats as important as the internal tire temperature when drivingt.

aldive,
True, the running pressure (actually temp) is more important, but how many people bleed off excess air in their tires.


I do when I take the motorcycle to the Track.. (you need them hot to keep them sticky).. but it just isn't normally feasable on a street vehicle..

so we should keep it at about 33-35 psi right?? Why does it say to keep it at about 25 psi on the inside of my door (driver side)?

for your stock tires?????

the best place to check is the tire itself...it will say right on the side what pressure to run it at

I keep mine at 32psi cold. :redexp:

The way I figure out my starting pressure for a new set of tires is to look on the tires first..

The If the tires say 2500lbs max @ 50psi that means each tire can hold 2500lbs with 50 psi in it. That means all of them combined can hold roughly 10000lbs total at 50psi..

So.. you need to figure out how much weight each tire will see.. figure the Explorer weights roughly 4500lbs (this is just a rought number, kinda an average)..

I know this isn't actactly correct, but figure you have 2250 lbs on the front and 2250lbs on the rear of the truck..

That means each tire will see 1125lbs... so back to our orig number.. 2500lbs @ 50psi..
1125 is 45% of 2500.. and 45% of 50psi is 22psi.. That means you need an absolute minimum of 22psi in each tire to hold up your explorer.

now, I'm not saying run 22psi.. I'm saying that is your minimum.. I'd start at 30psi.. do the "chalk test" and see what gives you the flat profile. Also, as you increase the pressure, your ride may get better or worse (depending on your prefrence) but mileage usually goes up (to an extent)..

Each time you switch brands or models of tires you should re-do this type of test.. and the chalk test to find what is right for your tires..

Also, keep in mind that if you tow things or carry extra weight in the truck that you either need to keep enough air in the tires or add air before you carry the weight.

~Mark

I have 265/75/16's on mine. I used a load inflation chart and then did the chalk test yesterday. I'm running 31 psi up front, And 33 psi in the rear.