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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

tire pressure

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Old Mar 24, 2009 | 02:35 PM
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Question tire pressure

ive got a 1982 f350 with a 12 ft steel bed on it the front tires are 235.75.r16 the rear are duel they are 225.75.16 what tire pressure do i need to run in them right now they are at 35 psi i think thats not right what are you guys running in yours thanks a lot,
 
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Old Mar 24, 2009 | 03:24 PM
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It all depends on the tire manufacture, load range of the tire and how much weight you are hauling.

What works for me may or may not work for you.

I run mine so that the ride isn't too stiff and ensure that there is optimum contact patch with the road for even tread wear.

Then again I don't haul anything too heavy. When I do haul a load, I air them up temporarily.
 
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Old Mar 24, 2009 | 07:14 PM
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If you have the correct tires for that truck, you should be running way higher than 35psi. Some of those type tires have a max pressure on the sidewall around 80psi. I run 50psi in my 35's.

I would run them 10psi less than the sidewall number as a ballpark figure if you want to carry heavy loads.
 
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Old Mar 24, 2009 | 09:39 PM
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I used to run 40 psi in mine (265/75/16), but in the heat of spring/summer they started blowing out. Run what the tire manufacturer suggests to save yourself lots of time and money. Tires are getting more expensive every day it seems.
 
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Old Mar 24, 2009 | 09:56 PM
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Most blowouts are caused by too little air pressure not too much.

When tires are underinflated they generate a lot more heat which in turn weakens the sidewall causing the tire to fail.
 
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Old Mar 24, 2009 | 11:49 PM
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Thats what i was getting at. Sorry I didnt clarify. The lowest pressure i have seen on a 16 inch truck tire has been 60 psi. The ones i was running recommended 80 psi. I listened to my father and ran 40 psi for a more comfortable ride, unknowingly sacrificing tire life.
 
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Old Mar 25, 2009 | 05:19 AM
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thanks for the info ill put 50 or 60 psi in them and see how it does,
 
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Old Mar 25, 2009 | 06:59 AM
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I run 31s on my 81 f-100 and run them at 40psi also live in the desert.
 
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Old Mar 25, 2009 | 07:11 AM
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I always thought you was supposed to run the psi recomended by the vehicle manufacturer which is usually found on the door sticker.
 
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Old Mar 25, 2009 | 07:17 AM
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my door sticker does not have tire data on it, It just says incomplete truck data and manufactured in canada the tires say 80psi on them i dont know if thats the recomended pressure or what that means thanks
 
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Old Mar 25, 2009 | 07:32 AM
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Well if i had to guess I would say 50-55psi we run 65 in our rollback with a 25ft flatbed and the standard stock ( truck and tires ) recomended psi is 32-35
 
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Old Mar 25, 2009 | 09:32 AM
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More psi for more weight. I'd run 38-42 psi while just riding around. But, if you were to put a ton or two of weight in the back, air them up to near max.
 
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Old Mar 25, 2009 | 01:48 PM
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40 ps1 in your 31's on your F100 is ok since it doesnt nearly weigh as much as a F350.
 
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Old Mar 25, 2009 | 11:02 PM
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All tires are not created equal. They have different ply counts. Usually the more plys, the higher weight capacity of the tire(called load range) and the more air you have to run. If you are going to guess at the amount of air you want to run, always look at the sidewall first, and never go over that.

It's been my experience if you have a wide tire, you need to be careful on how much air you run, since too much air will tend to wear the center tread out too early. If your tire is fairly normal as far as width, I have never had any problems running the tire at the max sidewall pressure number. I usually try that on most of my vehicles to get the best fuel mileage, though it will give a rougher ride.
 
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Old Mar 25, 2009 | 11:06 PM
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I run my fronts at 50-55 psi and the backs at 65-70 psi.

235 85's up front, 285 75's out back.
 
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