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DBoat 03-18-2013 11:38 AM

PSI offroad
I am sure there are some threads on this... but..

I have 17" wheels with 33" tires.. just need some recommendations on how far to air down the tires for some crawling. I run 30 psi on the street..

Is 17 psi low enough? 12 psi? Post up..


Jerry Bransford 03-18-2013 11:40 AM

Until you get below 15 psi, you're not really airing down for offroading. You can safely air down to 11-12 psi. But part of that depends on your wheel width... you can safely air down to lower air pressures before it may unseat with a 15x8 wheel than you can with a 15x10 wheel.

Even before I got my beadlock wheels I would air my 35x12.50 tires on 15x8 wheels down to 7-8 psi for tougher trails & they never unseated.

Sherpa 03-18-2013 02:40 PM

Like Jerry, I am also running 35x12.50 tires on 15x8 non-beadlock wheels. I regularly air down to 12 psi front, 10 psi rear and have no issues whatsoever off road. I leave a couple extra pounds up front since (in my mind, anyway) a tire that steers is more likely to unseat... though I'm pretty confident I could drop another two pounds without worry.

1ofakind 03-18-2013 05:34 PM

i have 33x12.50 on my 15x8 wheels, typically air down to 6-8psi in the snow with zero trouble. 10 would work also

Michigunman 03-18-2013 06:02 PM

1 Attachment(s)
Not knowing your exact specs, I'm running similar. 285/70x17 (33x11.5) tires on 8" wide rims. I had been airing down to 12 psi. I recently started going down to 10 with noticeable improvements. My tires were barely squatting at 12. Never burped any air or had any issues.

Attached is a picture from this past weekend.

amiller 03-18-2013 06:18 PM

Generally between 8 and 12 psi. is where I play

beaureed445 03-18-2013 06:23 PM

If I'm running 33x12.50's on a 15x10 rim, how far can I go down before it becomes an issue? The last thing I want is to blow a bead because I air down too far.

DBoat 03-19-2013 08:41 AM

Thanks for the great responses.. I will look at the width of my 17" rims and get the exact tire size tonight and post up.. however, it looks like I am heading to 10 lbs for this excursion.
on a related note, my buddy Mike and I installed the holders for the CO2 tank last night in the tub of the Jeep. They should work well..

GoldenSahara00 03-19-2013 08:51 AM

12 is good but it depends on the tire compound. My duratracs at 12 and MTR at 8 behave about the same.

Jerry Bransford 03-19-2013 09:21 AM


Originally Posted by beaureed445 (Post 3520454)
If I'm running 33x12.50's on a 15x10 rim, how far can I go down before it becomes an issue? The last thing I want is to blow a bead because I air down too far.

You should be fine at 12 psi or thereabouts. Some go down a little further with a 10" wide wheel but...

DBoat 03-19-2013 05:53 PM

Wheels are 17x9 tires are 295x70x17s


DBoat 03-20-2013 10:12 PM

Guess I am going to go to 10 psi and give it a try.. unless I hear from Jerry otherwise..

DBoat 03-24-2013 06:40 AM

Aired down to 11 psi and what a difference. Thank you all for the advice. As an aside, used my new CO2 setup to air back up. All Incan say is W O W. this is the setup for the truly impatient. Took maybe a minute per wheel.

SweetTeaDrinkerTJ98 03-24-2013 08:08 AM

For the sand we go down to 9-10

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