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Old 05-27-2013, 11:40 AM   #1
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Airing down for sand

Does anyone know how far I can air down my tires for driving in soft sand and dunes? I will be heading out soon with my quad and trailer for the first time and not sure how far down I can go without breaking a bead on my 285/70/17's. I'm thinking around 18-20psi?

Any suggestions?

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Old 05-27-2013, 12:56 PM   #2
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I went down to 11psi on my 31x10.50x15s. I'm not totally sure what you could go down to.

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Old 05-27-2013, 01:02 PM   #3
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18 - 20 is not low enough. I have the same size tire and go down to 10 psi on trails and rocks.

10, 12 max on sand is what I would run. It's what I used to run on the dunes in Michigan too.
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Old 05-27-2013, 01:48 PM   #4
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I ran 14 psi in the front and 12 in the back on reccomendation of the random guy that i bought a dune flag from at the gas station, the one time i went to silver lake. I have duratrac 33x12.50s on 15 inch rims. It worked absolutely beautifully with never a hint of actually getting stuck, though on some of the big climbs i got to a point where forward movement was no longer possible....backing out in 4 lo is not stuck.

I was usually in 2 hi on the sand. Only need 4 hi for water crossings and climbing big dunes.

Remember the bigger the tire the lower the pressure you want. I couldve gone a lot lower.

If you go to silver lake, david allen racing shuts their compressor off at 8 and nothing is open late at night over there.

I reccomend bringing a shovel.
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Old 05-27-2013, 08:31 PM   #5
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Quote:
Originally Posted by Michigunman View Post
18 - 20 is not low enough. I have the same size tire and go down to 10 psi on trails and rocks.

10, 12 max on sand is what I would run. It's what I used to run on the dunes in Michigan too.
When you said you ran 10-12psi in sand, was that with the wheel/tire combination in your jeep profile?

"17"x8" Pro Comp Knight Chrome Extreme Alloy wheels with 4.5” back spacing. 285/70/17 BF Goodrich Mud Terrain KM2’s (33” x 11.5”)"

Also would I be able to tow my atv trailer with that?
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Old 05-27-2013, 09:04 PM   #6
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I have 315/70/17s and I run perfectly well at 15 psi on sand dunes. I live in middle east where all around u is sand.
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Old 05-29-2013, 11:22 AM   #7
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Quote:
Originally Posted by stad33 View Post
When you said you ran 10-12psi in sand, was that with the wheel/tire combination in your jeep profile?

"17"x8" Pro Comp Knight Chrome Extreme Alloy wheels with 4.5” back spacing. 285/70/17 BF Goodrich Mud Terrain KM2’s (33” x 11.5”)"

Also would I be able to tow my atv trailer with that?
Why are you towing your atv trailer on sand? If you are, i would use more air pressure on the rear tires. Just like i used more air pressure on the front tires...theres an engine there! When you unhook that trailer take more air out if needed. We also use 120 psi on front tires on semis and 100 on the duals.....

I would not tow that trailer on the street aired down.

Ive heard that sometimes mud terrains will dig into sand and perform poorly. No experience there though. That is a good tire size though.
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Old 05-29-2013, 11:48 AM   #8
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Mud terrains are fine on sand when aired down. One friend has a jeep with aggressive mt tires. At full pressure, he can't keep up easily. Aired down, he is as good as anyone else. The right psi depends on so many things. Here I use 8.5 or 7.5, and you MUST be under 10 or you will sink on flat ground during the hot part of the day. I would start higher (12? ( and lower it if you get stuck, until you can go through any soft spots.
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Old 05-29-2013, 11:51 AM   #9
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Oh, and I never saw a wrangler lose a bread in our sand, except when some guy went to 3 psi on street tires.
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Old 05-29-2013, 01:07 PM   #10
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Quote:
Originally Posted by stad33 View Post
When you said you ran 10-12psi in sand, was that with the wheel/tire combination in your jeep profile?

"17"x8" Pro Comp Knight Chrome Extreme Alloy wheels with 4.5” back spacing. 285/70/17 BF Goodrich Mud Terrain KM2’s (33” x 11.5”)"

Also would I be able to tow my atv trailer with that?
No, different tires then. I was running a 32" x 11" x 17" Nitto Terra Grappler (AT) at the time. Not too far off in size though.

When I air down my current tires to 10 I'm running on rocks where there is probably much more risk of burping a bead and have had no issues.
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Old 05-29-2013, 02:15 PM   #11
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bro, at least 10 psi if youre tryin to cruise around and not get stuck like some soft sand noob
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Old 05-29-2013, 04:12 PM   #12
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Quote:
Originally Posted by Abdul-Hakeem View Post
Mud terrains are fine on sand when aired down. One friend has a jeep with aggressive mt tires. At full pressure, he can't keep up easily. Aired down, he is as good as anyone else. The right psi depends on so many things. Here I use 8.5 or 7.5, and you MUST be under 10 or you will sink on flat ground during the hot part of the day. I would start higher (12? ( and lower it if you get stuck, until you can go through any soft spots.
Wonder why i had heard that then. Anyway you know tire pressure is affected by tire size....
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Old 05-29-2013, 04:25 PM   #13
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I have 35X12.50X15 BFG AT on Mickey Thompson Classics 15X10 rims, out at Pismo I usually run them down to 10 psi with out any problems, most of the time in 2WD. on my 33X12.50X15 Hercules Traildiggers on black steelies 15X8 rims I can get away with 8 psi. have to be careful when airing down past 10 psi without beadlocks, they will pop off when doing doughnuts!!
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Old 05-29-2013, 04:39 PM   #14
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Quote:
Originally Posted by TheBestCoast View Post
bro, at least 10 psi if youre tryin to cruise around and not get stuck like some soft sand noob
Simple and to the point.
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Old 05-29-2013, 09:41 PM   #15
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Thanks for the tips everyone. That is exactly what I'm trying NOT to do is look like a sand noob (even though I am) lol. And because this will be my first time, not breaking a bead is of upmost importance. I'm not trying to pull the trailer all day in soft sand, just gotta go through some soft spots to get to where I need to park. Depending on how busy it is I won't have the luxury of parking right at the entrance.
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Old 06-03-2013, 09:27 PM   #16
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I have 35s 12.5in wide on 17in wheel. I go down to 15psi and I can not only cruise on sand dunes but also can pull stuck Nissan petrol and Toyota land cursers like a breeze.
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Old 06-08-2013, 03:45 PM   #17
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if you have all terrain tires you can go that low.I am in New Mexico we have this a lot and i do fine with towing a atv.

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