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Old 05-25-2011, 08:59 AM   #1
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tire pressure on road

after reading this article; Under Pressure: Proper Tire Pressure for the Trail - Jp Magazine

got me thinking for you DD do you have the pressure at 35, 30, 25 or lower?

what are the benefits

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Old 05-25-2011, 09:06 AM   #2
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I run mine at 37. I go by the door sticker. Actually I go by the door sticker of a Rubicon since I have an X and I'm running Rubicon tires and wheels.

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Old 05-25-2011, 09:07 AM   #3
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I usually run street tires over the rated pressure by 5-10 psi. Beter MPG, and the tires run cooler. Bit bumpier ride but...

This article is great for offroad airing down but they are very vauge for the onroad part.
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Old 05-25-2011, 10:05 AM   #4
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[QUOTE=95YamJam;1260896]I usually run street tires over the rated pressure by 5-10 psi. Beter MPG, and the tires run cooler. Bit bumpier ride but...

Uneven tread wear, less traction (especially in rain or on ice), horrible ride.

Air them correctly, the MPG benefit is a myth.
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Old 05-25-2011, 10:17 AM   #5
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I run mine at 28/30 psi-works for me !!

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Old 05-25-2011, 02:39 PM   #6
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Quote:
Originally Posted by 95YamJam View Post
I usually run street tires over the rated pressure by 5-10 psi. Beter MPG, and the tires run cooler. Bit bumpier ride but...

This article is great for offroad airing down but they are very vauge for the onroad part.
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Old 05-25-2011, 03:33 PM   #7
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Uneven tread wear, less traction (especially in rain or on ice), horrible ride.

Air them correctly, the MPG benefit is a myth.

I'll stick with my method.

I have 60 k miles on a set of cheapo AT tires on my truck. No uneven wear at all and I averaged +1-3 mpgs since I have run them over pressured. Never had any traction issues on the street. I also rotate every 4k miles.

I also have 40k on a set of all seasons on my wrx wagon. Same thing. Better MPG, and great wear. 4500 mile rotoation on those. Also never traction issues. In fact, My wife went to work this winter with a level 1 snow emergency.

I've done it both ways on several vehicles and always come to the same conclusion.
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Old 05-25-2011, 04:17 PM   #8
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I run my 31" MT/Rs (first gen) at 25 psi on the street all year round. Depending on the terrain, I often don't air down when 'wheeling since I don't have an onboard air source. When I do air down, I typically only drop to 18-20 psi (again because I don't have onboard air).
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Old 05-25-2011, 06:22 PM   #9
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Quote:
Originally Posted by Sherpa
I run my 31" MT/Rs (first gen) at 25 psi on the street all year round. Depending on the terrain, I often don't air down when 'wheeling since I don't have an onboard air source. When I do air down, I typically only drop to 18-20 psi (again because I don't have onboard air).
Portable units work great and are inexpensive. I use the MV50.
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Old 05-25-2011, 06:41 PM   #10
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Portable units work great and are inexpensive. I use the MV50.
The mv50 is a good choice for smaller tires. I have one...worked well on my 32s...but now that I'm on 35s its pretty slow. Good thing I have an AC compressor in my shed ready to be converted to OBA
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Old 05-25-2011, 08:41 PM   #11
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search and read "chalk test" basically run a chalk line across the tire, when the jeep is loaded to normal condition conduct test starting at max pres listed on tire/door. Drop pressure to the point that chalk wears off evenly across the entire tread. Then add 5 psi for street handling.
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Old 05-26-2011, 11:39 AM   #12
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Portable units work great and are inexpensive.
I actually own a 12v portable compressor. I used it when I would go drag racing to make small pressure adjustments in my slicks between rounds. However, it is far too slow to air up four 31" tires.
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Old 05-26-2011, 11:52 AM   #13
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I've got OBA and a Q-89 Dually comp.

If I'm in a hurry (rarely), I can air up in under 10 minutes-

Ya gottta run with what ya brung !!

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Old 05-26-2011, 11:52 AM   #14
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Quote:
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I actually own a 12v portable compressor. I used it when I would go drag racing to make small pressure adjustments in my slicks between rounds. However, it is far too slow to air up four 31" tires.
What kind is it? Some of those compressors similar to the ones found in emergency roadside kits wont do you much good...at least if you want to fill up in a decent amount of time. The mv50 is reasonably priced and works pretty fast for what it is. On my 32s I went from 13-15psi to around 30 psi in just a couple minutes per tire...which isnt bad for a portable. Check them out...

Amazon.com: Q Industries MV50 SuperFlow Hi-Volume Air Compressor: Automotive
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Old 05-26-2011, 11:53 AM   #15
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[QUOTE=sparky;1261002]
Quote:
Originally Posted by 95YamJam View Post
I usually run street tires over the rated pressure by 5-10 psi. Beter MPG, and the tires run cooler. Bit bumpier ride but...

Uneven tread wear, less traction (especially in rain or on ice), horrible ride.

Air them correctly, the MPG benefit is a myth.
MythBusters: Tire Pressure Test : Video : Discovery Channel

I do agree with tread wear and traction. and always take the mythbusters with a grain of salt...

Control, 35psi (manufacturer recomendation)
tyres at 10psi = 3.7% increase in consumption
tyres at 30psi = 1.2% increase in consumption
tyres at 40psi = 6.2% decrease in consumption
tyres at 60psi = 7.6% decrease in consumption

Results not in video...
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Old 05-26-2011, 03:05 PM   #16
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On the jeep 32-11.50/15 I run 32 lb all the time .
My 1/2 ton 4X4 pickup 5 # over or 40 lb .
To date I have had zero problems get very good milage from the tires and gas .

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Old 06-04-2011, 12:23 AM   #17
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What do you run for pressure on mild trails?
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Old 06-04-2011, 09:13 AM   #18
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Street pressure-


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What do you run for pressure on mild trails?
If you're enjoying the scenery and having a good time on forrest/mild/even cl 2/3 roads-there's no reason to airdown !!

Exception--hills/shale/loose dirt--then 4lo and 15/18 psi !!

If you're on washboard roads and you're going a good distance--then airdown-

Otherwise, especially in good weather, don't even worry aboutit !!

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Old 06-04-2011, 10:25 AM   #19
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Quote:
Originally Posted by 95YamJam View Post
I usually run street tires over the rated pressure by 5-10 psi. Beter MPG, and the tires run cooler. Bit bumpier ride but...

This article is great for offroad airing down but they are very vauge for the onroad part.
What exactly do you mean by "rated pressure"? The MAX load on the sidewall?????
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Old 06-04-2011, 10:30 AM   #20
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Please tell us your not running up to 10 pounds over the cold psi max rating?
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Old 06-04-2011, 01:21 PM   #21
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Quote:
Originally Posted by Sherpa

I actually own a 12v portable compressor. I used it when I would go drag racing to make small pressure adjustments in my slicks between rounds. However, it is far too slow to air up four 31" tires.
I have the mv50 and it is very fast. If you're using one that plugs in then I can see your issue. You need one that connects directly to the batery.

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