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#12298745 - 06/17/17 05:25 PM tire pressure
94sktr Offline
Pro Angler

Registered: 04/20/10
Posts: 544
Just put a set of 265/70/17 Cooper AT3's on my 2010 Z71 1/2 ton. On the door of the truck it says 35 psi. I pull a 21' Ranger. I weighed it and it is around 4800#s with a tournament load and fuel. Was wondering what air pressure should I be running? Want to get the best performance out of them.

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#12298783 - 06/17/17 05:53 PM Re: tire pressure [Re: 94sktr]
Couples Team Online   content
Angler

Registered: 05/02/13
Posts: 268
Loc: Lindale
35

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#12299396 - 06/18/17 10:50 AM Re: tire pressure [Re: 94sktr]
SteezMacQueen Online   sleepy
TFF Team Angler

Registered: 11/02/14
Posts: 4476
Loc: Red Oak, Galveston, and Pagosa...
Have you done a chalk test? Where you draw a line across the tread then drive a bit and see if the chalk is erased evenly? It should be erased evenly from inside edge to outside edge. If the middle is erased and the edges are not, decrease pressure. If the opposite is the case increase pressure.

If the tire is the exact same as the OEM, then follow the door sticker.
_________________________
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#12299460 - 06/18/17 11:40 AM Re: tire pressure [Re: 94sktr]
Allison1 Online   sleepy
TFF Guru

Registered: 12/14/03
Posts: 17950
Loc: Grand Prairie, Tx
Quote:
Find the recommended tire pressure on the front door latch sticker on the driver’s-side door jamb or in your owner’s manual. Unmodified F-150's tires are recommended to be set at 35 psi when cold. People will also run 40 psi For better fuel economy at the expense of traction. Factory recommended settings are usually a compromise between ride quality, load capacity/handling, and fuel economy. Increasing the pressure will stiffen your ride some as it increases that tire's effective spring rate. You will improve fuel economy and load handling, however.


straight from Ford.
https://www.ford-trucks.com/how-tos/a/ford-f150-f250-how-to-determine-proper-tire-pressure-355594

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#12299867 - 06/18/17 05:44 PM Re: tire pressure [Re: 94sktr]
uncle_bagster Offline
Extreme Angler

Registered: 01/12/07
Posts: 2637
Excellent choice in tires, I might add.

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#12300521 - 06/19/17 08:09 AM Re: tire pressure [Re: 94sktr]
94sktr Offline
Pro Angler

Registered: 04/20/10
Posts: 544
thank guys. just wondering because i checked them the next day and they put 40psi in two and 35 in the other two.

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#12300614 - 06/19/17 09:05 AM Re: tire pressure [Re: SteezMacQueen]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6864
Loc: texas
Originally Posted By: SteezMacQueen
Have you done a chalk test? Where you draw a line across the tread then drive a bit and see if the chalk is erased evenly? It should be erased evenly from inside edge to outside edge. If the middle is erased and the edges are not, decrease pressure. If the opposite is the case increase pressure.

If the tire is the exact same as the OEM, then follow the door sticker.


Chalk test is what you need. The fronts should end up being a few pounds higher than the rears. By the standardized systems P rated tires are suppose to be able to carry their maximum rated weight at an inflation of 35 psi.

In my pickup I run around 40 in the front and 35 in the rear on similar tires with a 1/2 ton 4x4.

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#12302808 - 06/20/17 01:20 PM Re: tire pressure [Re: 94sktr]
94sktr Offline
Pro Angler

Registered: 04/20/10
Posts: 544
thanks

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#12304097 - 06/21/17 08:12 AM Re: tire pressure [Re: 94sktr]
texasbass1 Offline
TFF Celebrity

Registered: 02/12/05
Posts: 5596
Loc: The Colony, TX
I always run mine based on the recommendation on the tires themselves. I run Hankook's and they list the max pressure at 40 and that is where I run them. Never had a problem, the ride is a little stiffer than running at 35 but helps with the load carrying.
_________________________
Pat Leach



USAF MSgt Retired

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#12304109 - 06/21/17 08:19 AM Re: tire pressure [Re: 94sktr]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6864
Loc: texas
If your not loaded to max weight all the time running max PSI will decrease tread life.

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#12304679 - 06/21/17 12:49 PM Re: tire pressure [Re: 94sktr]
texasbass1 Offline
TFF Celebrity

Registered: 02/12/05
Posts: 5596
Loc: The Colony, TX
Funny my 50000 mile tires always last nearly that long. But to each his own


Edited by texasbass1 (06/21/17 12:50 PM)
_________________________
Pat Leach



USAF MSgt Retired

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#12304759 - 06/21/17 01:24 PM Re: tire pressure [Re: texasbass1]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6864
Loc: texas
Originally Posted By: texasbass1
Funny my 50000 mile tires always last nearly that long. But to each his own


Your right, I'm LOL frkazoid

Have a set of 50k mile tires with 30k miles on them that are way over 50% tread left and a set of 60k tires with 70K on them that are about 50% tread left... running max inflation is NOT the best answer.

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#12305544 - 06/21/17 08:46 PM Re: tire pressure [Re: 94sktr]
SteezMacQueen Online   sleepy
TFF Team Angler

Registered: 11/02/14
Posts: 4476
Loc: Red Oak, Galveston, and Pagosa...
So you are saying your "50k mile" tires are almost lasting to the end of their warranty period???!

They should last LONGER than the 50k mileage warranty. Haha if you inflated them properly, they should.
_________________________
RIP little Nitro




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#12305546 - 06/21/17 08:48 PM Re: tire pressure [Re: 94sktr]
Samsonsworld Offline
TFF Team Angler

Registered: 12/12/08
Posts: 3137
Loc: Oeste Del Tejas
Heck, I'm lucky to get 40k.

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#12382151 - 08/11/17 01:05 PM Re: tire pressure [Re: 94sktr]
psycho0819 Offline
Extreme Angler

Registered: 03/27/05
Posts: 1508
Loc: Kaufman
I run my tires 5psi below max recommended rating on the tire. Trailer tires are inflated to provide a full contact patch on the ground, similar to the chalk test mention earlier in this thread.
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