Advice on tire pressure

[Megawatt]

Those rocks look familiar.

32-36 for daily driving. Don’t hung up on a specific exact number.

off road I generally use 18 psi for bouncing around the Mojave. I have tire deflators set to 18psi and it’s been comfortable enough. If I need more grip I can easily go lower (just stay in double digit pressures). It’s faster than having to add a couple pounds because starting out too low.

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[azwjowner]

I can't believe no one else has noted that you are running a 235/80/17 tire. The tire size is a key factor of safe pressure. 235/80 is smaller and much narrower than most Jeep owners run. That is a 31.8" tire that's about 9" wide.

I would go no lower than 35 PSI on road. That gives you a load rating of about 1800 pounds per tire, a good margin. I run 255/75 at 32 PSI, but those are both wider and taller. The larger you go, the lower the pressure.

 

[jurko]

i only see 4 tires on that Result listing; you *did* get all 5 so you'll have a matching spare to get out of wherever you are if you cut up another tire, right?

i typically run Cold PSI in the low-mid 30s on the road depending on conditions; if i see pressures rise more than about 10% in regular use i know my Cold PSI is too low and adjust.

off-pavement i usually start around 12PSI, and will run lower if on Sand or loose Snow.

seeing your last story and knowing the area you're playing in, i'd suggest you might want to investigate a newer cell phone that has Satellite capability for when you're out of Cell coverage. a friend of mine actually used this feature just this weekend when a J**p he rented didn't turn out to be working like it was supposed to (front axle didn't seem to be engaging in 4WD!)

I am on SS so moneys are tide. I did purchase only 4 KO3's. For now I got spare what came as OE which was Nexen HTX2. There's only 1/2" difference in Dia. between those two.

Next January I am going to purchase another KO3 and will rotate all 5 of them. On my list is also tire deflator and Milwaukee M18 Inflator. For now I am running 32 Psi on and off road and staying mostly on gravel trails. I'm getting cell phone soon.

 

[jurko]

I can't believe no one else has noted that you are running a 235/80/17 tire. The tire size is a key factor of safe pressure. 235/80 is smaller and much narrower than most Jeep owners run. That is a 31.8" tire that's about 9" wide.

I would go no lower than 35 PSI on road. That gives you a load rating of about 1800 pounds per tire, a good margin. I run 255/75 at 32 PSI, but those are both wider and taller. The larger you go, the lower the pressure.

The only driving on the road I do in a Jeep is at most 2-3 miles to get to trails, that's it. I got a VW Golf for on the road.

 

[azwjowner]

The only driving on the road I do in a Jeep is at most 2-3 miles to get to trails, that's it. I got a VW Golf for on the road.

Well then 15 PSI since the tires won't heat up that much in 2 to 3 miles. But if it's really for only off-road use, you should have gone for the KO3 in 285/70/17

 

[Megawatt]

Your on SS. Keep the spare with the old tire. YOU don’t need 5 tires since it’s 3 miles to trails and not your daily driver. Your old tire can be used to get you home, that will save your a couple hundo bucks.

 

[jurko]

Well then 15 PSI since the tires won't heat up that much in 2 to 3 miles. But if it's really for only off-road use, you should have gone for the KO3 in 285/70/17

Oh ok. That's a good idea. I'll try 15psi tomorrow morning and see how it feels and leave it that way.
Since I bought this Jeep in September I put on over 1K miles. I've been going off road 6 days a week for a couple of hours every morning at sunrise with my Cane Corso who runs next to or behind the Jeep. I also pull over at least once and do some hiking.
Here's couple examples we go to.

Why should I have gone for the KO3 in 285/70/17? What would I gain from them besides little over 1" in clearance and looks in comparison to what I got? Majority of trails around here are mostly gravel. I don't plan on doing any rock crawling anyways.

 

[jurko]

Your on SS. Keep the spare with the old tire. YOU don’t need 5 tires since it’s 3 miles to trails and not your daily driver. Your old tire can be used to get you home, that will save your a couple hundo bucks.

Hmmm you're right. That's not a bad idea Thanks

 

[azwjowner]

Why should I have gone for the KO3 in 285/70/17? What would I gain from them besides little over 1" in clearance and looks in comparison to what I got?

Pretty much that, but that size comes in a C load rating. Yours are E, a bit stiffer and less comfortable. Airing down will even things out mostly, but not entirely.

 

[jurko]

Pretty much that, but that size comes in a C load rating. Yours are E, a bit stiffer and less comfortable. Airing down will even things out mostly, but not entirely.

You're right they are little stiff @32psi. Tomorrow morning I'll do 15 psi as you suggested and report back.
Thanks.

 

[azwjowner]

You're right they are little stiff @32psi. Tomorrow morning I'll do 15 psi as you suggested and report back.
Thanks.

Before you drop the pressure, measure the height of the sidewall under the vehicle weight (vertical distance from the ground to the bottom lip of the wheel) and compare to the same measurement @ 15 PSI. I wouldn't want the height to decrease by more than 25 percent, so you don't have any issues about pinching a very floppy sidewall or losing too much ground clearance. I suspect it won't be a worry with your E tires, though.

Also use the TPMS to monitor tire temperature when you leave your house and when you arrive at the trail. If the tire is too low it will heat up a lot, which causes pressure to increase. If it's really just 3 miles or so on the road, I would hope your pressure doesn't go up by more than 3 PSI.

 

[jurko]

Before you drop the pressure, measure the height of the sidewall under the vehicle weight (vertical distance from the ground to the bottom lip of the wheel) and compare to the same measurement @ 15 PSI. I wouldn't want the height to decrease by more than 25 percent, so you don't have any issues about pinching a very floppy sidewall or losing too much ground clearance. I suspect it won't be a worry with your E tires, though.

Also use the TPMS to monitor tire temperature when you leave your house and when you arrive at the trail. If the tire is too low it will heat up a lot, which causes pressure to increase. If it's really just 3 miles or so on the road, I would hope your pressure doesn't go up by more than 3 PSI.

Ok. I'll do that. Thanks

 

[zouch]

maybe,...

i wouldn't want any worse of a tire to get me out of where i damaged a tire than i used to get in to where i damaged a tire.

Your on SS. Keep the spare with the old tire. YOU don’t need 5 tires since it’s 3 miles to trails and not your daily driver. Your old tire can be used to get you home, that will save your a couple hundo bucks.

 

[Atomic-Mouse]

You have gotten enough information on tire psi so I will just suggest getting a tire plug kit to go with your M18 air compressor. Most times you can plug a flat tire faster than you can swap out a spare tire.
https://www.amazon.com/BETOOLL-Repa...M9QDG8R&psc=1&ref_=pd_basp_m_rpt_ba_s_7_cp_sc

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