Air pressure question for 285's BFG AT's

[College Cruiser]

Hey Y'all,

Yes I am a new member wohoo!

I am driving a 2000 LC with slee diff drop, 2.5" lift and BFG AT 285/75/R16's and have a simple question about air pressure. I run them at 35psi when on the road and drop them down to 25 or so when on the trails but they seem to be wearing very fast. Do y'all think that I run them too low on the road? and if so, what pressure do you suggest I should keep them at? Or could it be an alignment issue.

Thanks for the help guys,

Ryan E.

 

[phsycle]

I don't think that's too low. Wear problem is most likely your alignment. Did you get it aligned with the lift? How is the toe? That will usually wear out a tire the quickest.

 

[KlausVanWinkle]

That being said, do a chalk test to figure out what the pressure for your weight should be. I have 285s and run then at 38 front 41 rear on the road. 25 might be kind of high offroad. For off road, I'd read to measure the distance from the ground to wheel when at street pressure and to let air out until you're at 75% of that height for most circumstances. Sand and snow are different.

 

[SupraTuRD]

For the street, I run 38psi front, 40psi rear. Perfect wear pattern after 30k miles. Off road, air down all to 20psi.

 

[College Cruiser]

Yeah I got an alignment done when I put them on about 15k ago. The tires have worn more than I thought they would, especially the outside edge of whatever tires are on the front. Ill raise the pressure for on road driving for sure. How would I know if I need another alignment?

 

[2000UZJ]

Yeah I got an alignment done when I put them on about 15k ago. The tires have worn more than I thought they would, especially the outside edge of whatever tires are on the front. Ill raise the pressure for on road driving for sure. How would I know if I need another alignment?

Adjust your toe. Your wheels are sitting like this / \ , it's constantly slipping on the outside and eating away. My tired used to do the same.

 

[gtfour43]

You can do a quick check to what 2000uzj said. Measure the distance between the front tires to see if they're relatively parallel. Pick a spot on the tread and check the distance at 3 and 9 oclock. This should give you a clue if something is off but i'd agree with nick and say your probably toed in.

 

[mechanixhorseman]

Adjust your toe. Your wheels are sitting like this / \ , it's constantly slipping on the outside and eating away. My tired used to do the same.

I'm going to check this later. I'd imagine that they won't be exact down to the millimeter front and rear, but what would you say is an acceptable tolerance without to adjust the toe-in?

 

[2000UZJ]

I'm going to check this later. I'd imagine that they won't be exact down to the millimeter front and rear, but what would you say is an acceptable tolerance without to adjust the toe-in?

I can't say for sure. I run -0.1* of toe and it drives fine, this has fixed my tire wear and tramlining on the highway. I run 2.8" of front lift, so having the toe properly adjusted is vital to not having it wander. I will get the exact specs for you later if I can find my alignment sheet and the FSM specs.

 

[College Cruiser]

I'll measure that today thanks guys.

 

[cary]

As a rough guide, when switching from a pmetric tire (oem) to a LT tire, the pressure should be increased by 8 psi. Load range of the lt tire is irrelevant in setting pressure.

 

[Nottajeep]

I run 44 PSI on my 295/75/16 and it feels just about right. Tried running 35psi and it was too lethargic.

 

[TheFuzz]

First, welcome to 'Mud. I have family up in Wellington. Going to CSU? My sister in law is in the veterinary program there.

I run 44-46 psi in my e-rated 285 DuraTracs...but every time I go to discount to get them rotated, they drop the pressure back down to OEM tire inflation which is retardedly low...and I keep forgetting to tell them to change the specs in their system.

I'd up your pressure a bit and keep an eye on your alignment.

 

[College Cruiser]

Yeah I'm a Business Finance major at CSU. And thanks! Yeah I raised the pressure and am going to have the alignment checked when I get new brake pads on it in a week.

Thanks for the input,

Ryan E.