tire pressure
Posting Guru
Joined: Feb 2004
Posts: 2,148
Likes: 6
From: Western New York
Start with what is listed in your owner's manual or the label on the door. To determine how to fine tune your air pressure to the way you drive and your load, take a look at this thread:
https://www.ford-trucks.com/forums/5...45-75-17e.html
Post any questions you may have after that.
https://www.ford-trucks.com/forums/5...45-75-17e.html
Post any questions you may have after that.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
Yeah, that's a good thread 
One important thing is that the proper pressure depends on the load, and load can vary a lot on trucks, especially on the rear axle. But it's always safer to err on the high side and have overinflated tires vs. underinflated.
BTW, did you treally mean 235/75R16 and not the more common 235/85R16?
One important thing is that the proper pressure depends on the load, and load can vary a lot on trucks, especially on the rear axle. But it's always safer to err on the high side and have overinflated tires vs. underinflated.
BTW, did you treally mean 235/75R16 and not the more common 235/85R16?
Elder User
Joined: Sep 2006
Posts: 871
Likes: 0
Proper pressure varies on vehicle, tire manufacturer, and tire type.
You should be able to find a decal on your door jamb, giving you the "manufacturer's RECOMMENDED pressure".. keep in mind this will usually give you the best ride, but not necessarily to best fuel economy and tire wear.
Stamped on the side of the tire is MAX pressures that tire can handle... typically it's 35 for a passenger tire, 50 for a LIGHT TRUCK load range C, 65 for a load range D, and 80 for a load range E.. but that's not ALWAYS the case.
If your vehicle calls for a passenger tire, but you're installing light truck tires (P235/75R16 is passenger, LT235/75R16 is light truck), make sure you add 15 PSI to the manufacturers recommended pressure, but not exceeding the tire's maximum pressure. For example, if you truck says 30PSI, and you put on a LT tire... air it to 45 PSI.
You can go up to the maximum pressure on the tire.. but only if the wheel is rated for that high pressure as well. Usually it's stamped on the wheel itself.
Good luck.
You should be able to find a decal on your door jamb, giving you the "manufacturer's RECOMMENDED pressure".. keep in mind this will usually give you the best ride, but not necessarily to best fuel economy and tire wear.
Stamped on the side of the tire is MAX pressures that tire can handle... typically it's 35 for a passenger tire, 50 for a LIGHT TRUCK load range C, 65 for a load range D, and 80 for a load range E.. but that's not ALWAYS the case.
If your vehicle calls for a passenger tire, but you're installing light truck tires (P235/75R16 is passenger, LT235/75R16 is light truck), make sure you add 15 PSI to the manufacturers recommended pressure, but not exceeding the tire's maximum pressure. For example, if you truck says 30PSI, and you put on a LT tire... air it to 45 PSI.
You can go up to the maximum pressure on the tire.. but only if the wheel is rated for that high pressure as well. Usually it's stamped on the wheel itself.
Good luck.
Senior User
Joined: Sep 2003
Posts: 243
Likes: 0
So here's a question, my 94 F-350 doesn't have a tag on the door like usual, why, I don't know, may be a crew cab thing. What's the proper pressure to run the tires? I usualy try to shoot for 50psi all around, but since there E-load rated tires, 235/85/16 I think they should probably be more.
On the tire it says max-PSI is 80, however I pumped them up to 60 once, and there were bulges in the sidewalls. Granted there cheap tires (thanks dad) but I certianly didn't feel comfortable going up to 80.
Should I do something like 50-55 in the rear and something like 60-65 in the front? Right now im at school and won't be hauling any "loads" at least not significant ones anytime soon.
Reason I ask is im going for mpg, anything! to help. right now im at 6.5/9 and thats with being gentle.
thanks -myers
On the tire it says max-PSI is 80, however I pumped them up to 60 once, and there were bulges in the sidewalls. Granted there cheap tires (thanks dad) but I certianly didn't feel comfortable going up to 80.
Should I do something like 50-55 in the rear and something like 60-65 in the front? Right now im at school and won't be hauling any "loads" at least not significant ones anytime soon.
Reason I ask is im going for mpg, anything! to help. right now im at 6.5/9 and thats with being gentle.
thanks -myers
Posting Guru
Joined: Feb 2004
Posts: 2,148
Likes: 6
From: Western New York
Fal Grunt, the tag probably just fell off as they are just a sticker now days. Try the pressures you are thinking about and use the chalk method that was discussed in the link I posted above. It takes very little time to do and costs next to nothing (the cost of some chalk) to get your tire pressures figured out. Good luck and let me know if you have any questions.
