What Pressure with Staun Tire Deflators?

[illzoni]

I have a set of Staun Tire Deflators and like them very much. However, I'm not sure what pressure I should set them to.

Stock pressure for my truck is 26psi and I have my Cooper Discoverer S/Ts set to that when on the road. Currently, my deflators are set for 18psi.

On my recent hunting trip, my experience has me doubting my 18psi setting. Hunt area is about 5k feet above my daily location, and nearly 20F cooler. I was happy with the tires whilst wheeling around on a very rough dirt road, but became concerned after a quick run down the front of the mountain on pavement...they were very low (under 10psi)!

Here's what I think...
When we speak of tire pressure, we usually mean a cold reading (26psi for road). But when the deflators are used, the tires are already warmed up after having driven over pavement to get to the wheeling location. Should the deflators then be set to a warm-temp PSI instead of cold?

I expiremented and found with the front tires set at 19.5PSI cold, they rose to 24PSI after driving about 30 minutes on pavement. That leads me to believe a setting of about 22PSI on the deflators would be appropriate, translating to about 18PSI cold.

Watcha think?

Thx,
Jon

 

[J-money$$$]

it is all personal preference. I grew up going hunting, and my dad never aired down. They only time i air down is for crawling/recreational off roading. So with that said you should air down to whatever you are comfortable with. I air down to around 10 psi or less in back and 12-15 in the front. I have yet to pop a bead so i thin you are good at any pressure you choose

 

[JB.]

I have a set of Staun Tire Deflators and like them very much. However, I'm not sure what pressure I should set them to.

Stock pressure for my truck is 26psi and I have my Cooper Discoverer S/Ts set to that when on the road. Currently, my deflators are set for 18psi.

On my recent hunting trip, my experience has me doubting my 18psi setting. Hunt area is about 5k feet above my daily location, and nearly 20F cooler. I was happy with the tires whilst wheeling around on a very rough dirt road, but became concerned after a quick run down the front of the mountain on pavement...they were very low (under 10psi)!

Here's what I think...
When we speak of tire pressure, we usually mean a cold reading (26psi for road). But when the deflators are used, the tires are already warmed up after having driven over pavement to get to the wheeling location. Should the deflators then be set to a warm-temp PSI instead of cold?

I expiremented and found with the front tires set at 19.5PSI cold, they rose to 24PSI after driving about 30 minutes on pavement. That leads me to believe a setting of about 22PSI on the deflators would be appropriate, translating to about 18PSI cold.

Watcha think?

Thx,
Jon

Yeah, you definitely need to take pavement heat into account. Reviewing some video made me decide on about 18psi as a lower limit in rough terrain to avoid pinches (in my case, 4th gen, 32" tires). With that in mind, my deflaters are set to 21-22 but just as you found, a combination of road heat, elevation change, and temperature could easily drop pressure well below that, so it's not a complete set and forget.

Also, a change of procedure to using the Stauns in pairs instead of all 4 has revealed them to be less consistent than I had assumed. Don't know if I got a bad batch but I can too easily end up with two tires 4lbs apart with the same deflater. Another gotcha.

 

[Mr. Leary]

I have used Staun deflators in the past, and found them very prone to getting out of spec. The quick solution for this is to adjust the preset to your desired mid-level down level. For me, this is about 20 front and 23 rear pressure. I used blue thread locker to keep them from getting misadjusted, and altered the pressure manually from there as desired.

Optimal air pressure has so many factors, but 26 psi seems very low to begin with. You must take into account what terrain you will be traversing, temperature differences between hot and cold, tire size, desired clearance / bite ratio, and tire sidewall durability.

Your math makes sense. What tire size are you running?

 

[illzoni]

I have used Staun deflators in the past, and found them very prone to getting out of spec. The quick solution for this is to adjust the preset to your desired mid-level down level. For me, this is about 20 front and 23 rear pressure. I used blue thread locker to keep them from getting misadjusted, and altered the pressure manually from there as desired.

Optimal air pressure has so many factors, but 26 psi seems very low to begin with. You must take into account what terrain you will be traversing, temperature differences between hot and cold, tire size, desired clearance / bite ratio, and tire sidewall durability.

Your math makes sense. What tire size are you running?

Some thread lock is a great idea. The Stauns are prone to user error...it's too easy to accidentally turn the adjustment when installing and removing.

I'm running the Cooper Discoverer S/T in size 265/75R16. As the 4Runner is lighter than most trucks those tires are designed for, and the door plate says 26PSI, I'm quite comfortable with that pressure for street use.

Thx,
Jon

 

[iDRiVaT4R]

I have 285/70R17's and have these Staun Deflators set to 25 psi. I put permanent marker marks around it so I would know if they loosened up a little. I normally run my tires at approx 38 psi on the street. They are great and quick!