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Old 05-28-2013, 06:01 PM   #1
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Question on tire pressure.

The placard on the door post list weight limits based on 65psi tire pressure. The tires side wall list a much higher weight limit but at 80psi. My question is what psi do people go by?

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Old 05-28-2013, 06:11 PM   #2
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Since the tire side wall says 80psi, I assume it is a load range E. I was told by the dealer/installer of my E range Maxxis trailer tires that you should run them at the max 80psi (measured cold). He also said the weight capacity on the tire is what that tire is designed to carry at 80psi. Mine say max weight 3200lb at 80psi, so the four tires are designed to carry 12,800 lb total. The only reason I can think of why the sticker says a lower weight limit at 65psi is that the original tires were probably load range D, which I believe has a max of 65. Looks to me like someone already upgraded to E range tires - thus the discrepancy.

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Old 05-28-2013, 07:33 PM   #3
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I agree trailer tires should generally be inflated to the maximum cold tire pressure as indicated on the tire sidewall. If that maximum cold tire pressure is higher than on the placard, its important to check that the rims are rated to that cold tire inflation pressure. You don't want to put 80 lbs of pressure into a tire on a 65 lbs rated rim.
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Old 05-28-2013, 08:08 PM   #4
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Maybe I need to clarify. These are the OEM tires on my 2013 F250 4x4, srw, load range E and LT275/70R18. The side wall load says 3640 at 80psi.
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Old 05-28-2013, 09:27 PM   #5
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With the lower tire pressure, your truck will have a smoother/softer ride.
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Old 05-28-2013, 11:09 PM   #6
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I run 80# when we are hauling anything heavy or towing the trailer. For an empty truck I use quite a bit less tire pressure. Our truck has load range E tires.
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Old 05-29-2013, 08:44 AM   #7
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Wait! Are your rims rated for that pressure? I run mine at the door post which is 65 front and 60 on the 4 rears. While I agree with the statements above, you should confirm that those pressures will be tolerated by your rims. Check with Ford or look for markings on the inside of one to confirm it will take it.

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Old 05-29-2013, 09:29 AM   #8
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On my Chevy 2500, tires' sidewall are marked 80psi, the door jam label indicates 60 PSI front and 80 PSI rear. When towing or with a heavy load I run the 60/80 on label, when not towing/hualing I reduce the rear tires a bit to soft the ride some, typically I'll run 60/70 for daily driving.
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Old 05-29-2013, 10:39 AM   #9
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I run 80 PSI in my 2011 F250 while towing. 65 all other times.

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