Tire pressure - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 01-02-2014, 02:38 PM Thread Starter
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Tire pressure

Was just wondering what people were running for tire pressure. I have 285/75r16 and could decide on a pressure.

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post #2 of 4 Old 01-02-2014, 03:35 PM
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I run 60 up front and 70 in rear. Same size tire. Load range E.

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post #3 of 4 Old 01-03-2014, 03:49 PM
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Tire pressure is going to really affect the ride characteristics. I would take a look at stated pressure on tire at max load and drop it 10 psi and see how it does. Best way to monitor inflation is by watching the pressure when tires are hot.
Typical tire pressure climbs 6-7 psi when hot. This goes up with tire size to a degree. If they are under inflated they will be higher then a additional 6-7 hot.
Fuel milage will also drop if pressure lowered too much.

This is my recommendation: get the air out of tires and fill them with nitrogen. Much more stable don't expand with heat so pressures stay the same hot or cold within 1-2 psi.
Nitrogen is a larger molecule than air so a lower pressure is needed to give same load rating. It also does not hold moisture like air do tires and rims do not degrade with it's use.

Probably more info in a direction you weren't thinking about. lol
But it's great stuff, I have it in my tires and will not go back to air period.
Try some different pressures and see how you like the handling.


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post #4 of 4 Old 01-04-2014, 11:07 PM
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Wheel width plays a HUGE part in tire pressure. When I had 285s on an 8 inch rim, 45~50 psi made the centers wear out first. But, that same brand 285 on a 10 inch wheel had even tread wear at the same 45~50 psi.

With a NEW tire, run chalk across the tread and drive around the block, adjust tire pressure until the there is little to no chalk left on the tread. This is pointless on a tire that has uneven tread wear across its width.

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Last edited by Karls03; 01-04-2014 at 11:12 PM.
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