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Tire Air Pressure

BRENNAN81
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ISX

ISX

Posted
Posted

E tires seem to all be 80psi. I usually run that in the front to support the cummins. In the back, pretty well anything 50psi and above is fine.

stodg73

stodg73

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Posted

I have those tires and I run about 70psi in the front and anywhere between 50-80 psi in the back, depending if I have a load/trailer or not.

ISX

ISX

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Posted

I believe that the side walls on these tires say 65 max psi cold? So how could I run up to 80 psi?:shrug:

Thanks

Prowelder

Prowelder

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Posted

I would look at them a little closer. They should be 80psi. To be load range E they pretty much have to be 80psi max, you can't support load range E weight if they can't hold that much pressure. From what I am seeing, Load range E is 80psi, D is 65, C is 50. It should say load range on the side, maybe yours says D.

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Mopar1973Man

Mopar1973Man

Posted
  • Owner
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I've ran as low as...

[*]50 PSI front

[*]40 PSI rear

And run as high as...

[*]70 PSI front

[*]60 PSI rear

I'm finding yes the lower number do produce a nicer ride but at a cost of 1-2 MPGs... But the high pressures do perform better MPG wise but does produce a very stiff ride.

Like when I'm wood hauling I aim for a high tire pressure... But if I'm going to be the Cummins Skidder for a day I'll reduce my tire pressures for a better bite in the ground for pulling. This also works for snow and sand.

Prowelder

Prowelder

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Posted

yes i've been told and have found out that the lower tire pressure is great for snow. i dont know about the sand we dont have that over here in SE Kansas!:lmao2:

Sure we do... It's right next to the coast line....:stirthepot:
Prowelder

Prowelder

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Posted

:doh:forgot about that:lmao::lmao2::lmao:

Just look for the yachts out in the distance and you will find it...:thumbup2: It will be in the same direction of the end of rainbow.:lmao2::lmao2::lmao::lmao:
Junkman

Junkman

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Posted

My Yokohama Geolander ATs drive like a dream at 65# all around. They wander all over the place at 80psi. It is so bad that driving is dangerous. So...anyone with wander, try dropping tire pressure first. 80 is above specs anyway.

dorkweed

dorkweed

Posted
Posted

When I had my '99, I kept 70psi in the fronts and rears on the OEM LT245/75 16E Michelins and the Cooper Discoverer AT's in LT265/75 16E's. Then, as now, I usually have a trailer of some kind in tow and don't like airing up and down all the time.With the tight/heavy suspension on these trucks, I think it rides better with "hard" tires.

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