I have the standard 16 inch rims and knobby tires (LT235/85R16) on my 88 F250 and was curious what others were inflating theirs to. My door sticker is long gone but I know the tires specifies 80 psi as its max. I had been using 60.
Well for example on my bf goodrich all terrains it says max 40 psi but you have to remember during the summer the heat causes air to expand ontop of driving which also heats up tires so i keep mine at 35. That also applys during the winter the cold causes the air molcules to come closer together causing the air pressure to go down so ill fill my up to 40 or so. Hopefully that helps you out my friend I also forgot to add if your offroading you inflate or deflate your tires accordingly
__________________
95 F150 XLT Extended Cab. Short Bed 5.8L 351 Windsor 4x4 200k + and running strong! Built FORD Tough!
Next step- Bigger tires, some lift and some more ponys!
I'm in the same boat as 93f250tn - 35 in spring-fall, 40 from late fall to early spring.
__________________ "Official Project Stages: (1) Uncritical Acceptance. (2) Wild Enthusiasm (3) Dejected Disillusionment. (4) Total Confusion. (5) Search for the Guilty. (6) Punishment of the Innocent. (7) Promotion of the Non-participants."
-Unknown
Ha, ha. This reminds me of an old joke we used to pull on the new recruits in the unit when I was in the Army. First day in the motor pool we would pull them aside and tell them their first task for the day was to go around and change all the air in the truck tires from Summer to Winter air, or vice versa. What a riot!!!
Well, my tires say max 50. but i only run 30 in the summer and 35 in winter. I do some pasture driving so it smooths it out a bit to have a little lower pressure. Not sure what the door tag says. But i do sometimes run about 45 in the rear when pulling a trailer.
Here's something to consider if you are bothered by changing tire pressures with the seasons. Have your tires filled with Nitrogen. Guy that recently sold me tires for my Mustang says Nitrogen keeps a more constant pressure than plain air because it's not temperature sensitive. It also helps resist the corrosion that sometimes forms in tires with aluminum rims. Of course it costs, but it was only about $5 to do all four tires and in this case refills and top offs are free for the life of the tire. Just something to think about. I had never heard of it before last month.
Ha, ha. This reminds me of an old joke we used to pull on the new recruits in the unit when I was in the Army. First day in the motor pool we would pull them aside and tell them their first task for the day was to go around and change all the air in the truck tires from Summer to Winter air, or vice versa. What a riot!!!
How about the left handed monkey wrench or bucket of steam?
__________________ On a quiet night you can hear sh*trolets rusting a mile away.
Old Rusty '91 F-150, 302, 2WD, auto., reg. cab, long bed
The Beast '01 FORD ( of course ) ex-cop car. 4.6 liter
Pat C. Mo. chapter member
Here's something to consider if you are bothered by changing tire pressures with the seasons. Have your tires filled with Nitrogen. Guy that recently sold me tires for my Mustang says Nitrogen keeps a more constant pressure than plain air because it's not temperature sensitive. It also helps resist the corrosion that sometimes forms in tires with aluminum rims. Of course it costs, but it was only about $5 to do all four tires and in this case refills and top offs are free for the life of the tire. Just something to think about. I had never heard of it before last month.
The Combined Gas Law applies to your tires whether the fill is 85% or 99% Nitrogen.
EDIT: Going from 85F to 15F is a -13% change so starting at 40psi would get you 35psi.
So what you're telling me is the guy at the tire shop was blowing smoke up my arse about Nitrogen having the same volume under all temperatures.
Yeah, that's not possible. When you heat a gas it expands and/or the pressure goes up and every gas expands at about the same rate. The difference between air and straight nitrogen is so little you'd need a physics lab to measure it. There are some minor benefits from it but that isn't one of them. Don't get me wrong though, it's not a bad thing, especially if you got it for free, but some of the shops really go nuts trying to upsell it.
Off the top of my head two benefits come to mind:
*less water/humidity than shop air BUT if they used a water based lube to get the tires mounted that kind of kills that
*low oxygen can be good for some kinds of rims (aluminum) that don't react well to higher pressures of O2
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.
I also forgot to add if your offroading you inflate or deflate your tires accordingly
But i do sometimes run about 45 in the rear when pulling a trailer.
'90 F350 XLT Lariat, reg cab, dually, RWD, 4.10s, factory tow package, and lots of add-on goodies.
On a quiet night you can hear sh*trolets rusting a mile away.
