tire pressure
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New User
Joined: Jun 2002
Posts: 20
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tire pressure
I have a 1986 F-150 Extended Cab. I've found the factory sticker that says the correct tire pressure is 41lbs for 235/75 15inch tires. I have that exact size on my truck but on the sidewall of the tires it says don't put more than 35lbs of air in them. I've heard that the pressure in tires can change when warming up and cooling down and don't want to over inflate the tires to a dangerous level. Could anyone suggest a tire pressure that would be safe and yet not wear my tires from being underinflated?
Senior User
Joined: Jul 2002
Posts: 313
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From: Orlando
tire pressure
You may have the same tire size as the sticker indicates but you have a different brand and load rating. Do not exceed the max pressure indicated on the tire. If the tire says 35 psi max then the typical running pressure would be about 32psi.
Keep in mind that the tires you have may not be rated to carry as much weight as the truck was designed for. Typically the higher air pressure tires are a higher load carrying tire. See what the max load is on the tire and make sure that it is capable of supportin your truck fully loaded (if you intend to carry a full load).
Keep in mind that the tires you have may not be rated to carry as much weight as the truck was designed for. Typically the higher air pressure tires are a higher load carrying tire. See what the max load is on the tire and make sure that it is capable of supportin your truck fully loaded (if you intend to carry a full load).
Senior User
Joined: May 2002
Posts: 484
Likes: 1
From: Garden Grove USA
tire pressure
Also the "LT" or Light Truck tires can run a 10% pressure variation in either direction depending on the load you are carrying. Go based on the sidewall designation, not the sticker on the truck. If you have LT tires with a 35 psi rating, you can run 32 safely if you are empty and want a little smoother ride, or as high as 38 or 39 psi if you are hauling a load. "P" series tires only run the psi recomended on the sidewall. Do not deviate from that. the sidewall psi numbers are always cold, and heating of the tires are already taken into account by the manufactures when designating the psi.
