What the right PSI ?

[McLeadslinger]

You can’t chalk all off road tires. Some dont have a flat tread surface.

Experienced guess..32 if they are E load range 36 if C.

Gotta chalk. Tweak to your liking.

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[AZRanger]

I just put my 285s on but I’m still experimenting. 20 psi seems pretty comfortable for general trail use. Currently running 35 on road.

 

[Msfitoy]

How’s those 285’s going for ya?

I have 305’s.. they are absolutely beautiful, but my PSI & MPG, is just out of control lol… 16-16.5MPG.

Mine are on track to hit their promised 60K...although I hate the last 10-15K as they will start to look visibly worn but still have legal tread depth...

How tall are those 305?

 

[Msfitoy]

You can’t chalk all off road tires. Some dont have a flat tread surface.

My Coopers have flat contact blocks and chalk test with 37 cold-40 hot, at my weight of 5,000-5,500lbs shows full flat contact...your results may differ...

 

[IdahoRanger]

Had " The Works" done yesterday. 3 out of 4 tires measured 8mm and one 7. They have 21k miles on them.

They must not have measured the edges that show my hard cornering.

 

[Dieseldean1]

Go with indicated pressure on the sidewall of the tire. I have 235/80-17 Generals that are at 45psi.

 

[Wes Siler]

Go with indicated pressure on the sidewall of the tire. I have 235/80-17 Generals that are at 45psi.

That's usually the max pressure, and running that isn't a great idea unless your truck is loaded down to max capacity.

Remember that pressures vary by tire construction. A p metric tire will require less pressure than an LT or flotation tire, regardless of size.

Here's a good calculator, I'd encourage everyone here to start with its recommended pressure, then adjust up or down as you get a feel for it.

https://tiresize.com/pressure-calculator/

And yes, 15-18 PSI is appropriate off-road. Go lower on sand or deep snow, but don't go lower if you're going to hit rocks.

 

[RRTruuck]

When I drove my truck off the lot, the dealer had inflated the oem Hankook Dynapros to 46psi. I wondered why I could feel every single pebble on the road until I got home and realized what they'd done, smh

 

[V1nnn]

Your pressures are way to high on the street. I run 30-32 on the road with my Patagonia MT’s and 15-20 on trails.

Factory door said 39 PSI for factory tire 270/70/17, my new tires 285/70/17 that why I thought 39-40 PSI should make sense, but I’m not professional, Justin a regular weekend warrior.

 

[V1nnn]

This is what it look

 

[FordFreak]

Depends on the tires

 

[RedRocker]

Mine doesn't have a door sticker, thought that was kind of odd.

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