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Old 05-09-2010, 08:24 AM
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Chris Langdon Chris Langdon is offline
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Off Roading with low airpressure Question

i do a fair amount of Rednecking. my Jeep is lifted and I have never aired down my tires before. I always thought this was primarily for the rock guys and i am mostly trails, creek crossings and a little mud now and then.

Would airing down help or hinder off camber driving? We have some precarious spots and i have felt a little on ease before. Just looking for some advise before i learn the hard way!!
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Old 05-09-2010, 03:49 PM
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This would probably get more answers in the offroad section...
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Old 05-09-2010, 04:00 PM
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I would think that airing down would make you less stable on off camber situations. The benefit to airing down on the rocks is that your tires conform to the rocks aiding in traction. I would think in soft sand or snow, airing down would help out as well because your "footprint" would be bigger. However in off camber situations, your sidewalls can flex a little more and possibly give you a degree or more of lean. Just my thoughts.
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Old 05-09-2010, 04:05 PM
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Quote:
Originally Posted by Chief Gunner
I would think that airing down would make you less stable on off camber situations. The benefit to airing down on the rocks is that your tires conform to the rocks aiding in traction. I would think in soft sand or snow, airing down would help out as well because your "footprint" would be bigger. However in off camber situations, your sidewalls can flex a little more and possibly give you a degree or more of lean. Just my thoughts.

Good point, that would add stress to the bead and would pop off easier.
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Old 05-09-2010, 04:41 PM
Blake Blake is offline
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I air down because it makes the ride way smoother. I've been on some very, very off camber spots and never had a problem or wish I was at street pressure.
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Old 05-09-2010, 05:40 PM
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Lindel Lindel is offline
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From all appearances, this SHOULD be one of the busier threads on the board, however, it would seem that most replies have gone elsewhere, and the post authors have gotten all mixed up as well.
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Old 05-09-2010, 05:58 PM
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Quote:
Originally Posted by jaber
Good point, that would add stress to the bead and would pop off easier.

That could be true, but I think it also depends on your wheel tire combo. I am running a 33X12.5 tire on a 15X 8 wheel. I think this is a great combo cause I can air down and the tire still pushes against the wheel keeping it on the bead. My friend is running a 35X12.5 on a 15X7 wheel, and the tire doesn't sit flat, so airing down allows the tire to sit flat. If you are running a 12.5 wide tire on a 10 inch wide wheel, there would be a better chance of popping a bead. In all reality, it is a trial by error game. You have to find the air preassure that works for you with the tire/ wheel combo you have. Speaking of that, I wish I had beadlocks.
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  #8  
Old 05-09-2010, 07:44 PM
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Airing down makes washboard roads Soooo much better.
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Old 05-09-2010, 07:55 PM
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Quote:
Originally Posted by Locked and Loaded
Airing down makes washboard roads Soooo much better.

X2
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Old 05-09-2010, 09:34 PM
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I wheel similar conditions in Vermont, and I ALWAYS air down my tires... even for steep grades, and precarious locations. Similar to what was mentioned above, my tires are wide, and my wheels are rather narrow so I can air them down A LOT without any issues. With that said, you can still air them down if you have a 10" wide wheel, you just don't air them down to sub 10 psi, like I do. Next time you go out, try taking them down only 10 psi, then next time try 15, then 20, and so on. If you don't like the change in your off road handling characteristics, then run them full again. Some of it is preference, but I think you'll find a smoother ride will make you enjoy the drive much more.
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Old 05-10-2010, 07:21 AM
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Quote:
Originally Posted by Chris Langdon
i do a fair amount of Rednecking. my Jeep is lifted and I have never aired down my tires before. I always thought this was primarily for the rock guys and i am mostly trails, creek crossings and a little mud now and then.

Would airing down help or hinder off camber driving? We have some precarious spots and i have felt a little on ease before. Just looking for some advise before i learn the hard way!!
I do the same style of wheeling. I air down my 33x12.5x15 BFG A/T'S on 10" rims down to 20 PSI and they do GREAT. Now when I was running my 35x15.5x15 swampers on 14" rims, I never aired them down untill the tred wore down.
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Old 05-10-2010, 09:05 AM
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I wouldn't worry about that unless you have a narrow-trac with alot of lift and skinny tires. I air my 37's down to 12 (h2 rims) and my 38's down to 18 (16.5 rims) and they work great. I run alot in Jersey Pine Barren sand and Pa. rock and stump filled trails. Airing down really helps soften the ride on bumpy trails. Haven't felt threatened by off camber situations yet but we'll see what happens at ECI next month with my young padawan driver. Airing down is the main reason I installed on-board air.


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Old 05-10-2010, 11:01 AM
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I air down to 20 PSI on 33X12.5 right now. I tried airing down to 15 PSI, but the tires kept ruubbing the fenders too much. Once I open my fenders a little, I will be able to easily air down to 15 or even 10 PSI. the trick as some one mentioned earlier is to experiment a little. Find the air pressure that feel right for your driving style and terrian that you wheel in. This is one of theose personal preference issues.
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Old 05-10-2010, 01:17 PM
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I have yet to air down in my FSJ but, with my XJ w/31" tires i always aired down in mud and especially in the snow.
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Old 05-10-2010, 01:50 PM
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I generally don't bother airing down unless I get stuck... at the first sign of trouble I'll air down and usually just pop right out of whatever hole I was about to dig for myself.

That said, I don't generally go many places that get really off-camber, and you can feel it more when you do find a hairy spot. Sand, mud, snow, I've had success airing down in all of them; with really wide tires the benefit might be less noticeable than with the ones I tend to run. (up to 33s in the past on an XJ) And remember, how much you can air down safely depends on how you've matched up rim/tire size. stockers on 15x10s can't reliably go as far as on a 15x8, for example. (don't laugh, I've seen it.)
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Old 05-10-2010, 02:00 PM
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air down, it helps. The problem is if you're not running beadlocked wheels (which I assume you aren't). You have to find the happy medium. Too low and you'll roll a bead. Too much and you're not getting the full benefit of the tire. Also, if you're running 16.5s don't try and air down much, it'll slip off in a heartbeat and you'll be spending the majority of the day reseating beads.

For snow and mud I've always heard 2 schools of thought. Air-downed tires give a bigger footprint and allow more tread contact which will allow the vehicle to "float" better (float being relative). Taller, skinnier tires are able to reach to the hard surface below and have better traction. I personally have never ran a tall skinny tire because I believe a larger contact patch is better. I run as little as 4psi in the rear and 7 up front. I also run beadlocks.

To sum it up, air down to 12-15 and let it fly
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Old 05-10-2010, 02:41 PM
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33x9.5s on my narrow-track. Airing down does make things a bit tippier on sidehills, and around here that can result in a thousand vertical foot tumble. For that sort of work, I like to have the tires at street pressure (40 psi) and the shocks on full hard. I don't air down for snow or mud (except the red clay and cement snow back in the southeast), but go down to 20-25 psi for boulders, and as low as 12 psi for dry sand.

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Old 05-11-2010, 07:33 PM
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Chris Langdon Chris Langdon is offline
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I like the idea of experimenting. How about a few suggestions for Bead lockers?

this jeep spends 90% offroad. That is such a cool statement to make and make honestly.

this thread has been very informative.
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Old 05-11-2010, 08:17 PM
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keep in mind also the tire size compared to rim width. The contact patch of a wide tire on a narrow wheel will grow in length & very little in width.
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Old 05-12-2010, 12:05 AM
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Let's see beadlocks beadlocks beadlocks? Lol

There is the weld on beadlocks which will only lock your outer bead (unless running a huge wheels and welding a set on the back also).

Internal beadlocks such as staun or innerairlocks which will lock both beads and will look stock minus the second valve stem on each wheel.

H1 wheels which usually need to be recenterd, will lock both beads with the insert, but usually are very hard to balance.

Then there's the TEK screws, basicly just using self tapping screws and screwing them into the wheel surface into the tire bead or behind it. I've seen it done on both beads. Its also a old skool hot rod tip.
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