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Old 02-04-2012, 07:39 PM   #1
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airing down tires?

Hey guys I have a set of 35 12.5x15 bf Goodrich m/t km2's. Wondering what psi you usually air down for the trails? Thanks for the input!

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Old 02-04-2012, 07:54 PM   #2
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How wide are your wheels. You can air down further on a 8" wide rim than a 10" wide rim.

I air down to around 7 or 8 psi in the summer. 5 or 6 psi in the snow.

35x12.5x15 Procomp Xtreme MT's on 15x8 wheels.

No fancy spendy beadlocks and I have never unseated a tire.................yet.

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Old 02-04-2012, 08:05 PM   #3
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I wanna say I have 10" wide rims. Pretty positive because they are almost the width of my tires. Really that low? What's your tires normal (max) psi?
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Old 02-04-2012, 08:06 PM   #4
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Running 15x10 simulated beadlocks by the way
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Old 02-04-2012, 08:54 PM   #5
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I wanna say I have 10" wide rims. Pretty positive because they are almost the width of my tires. Really that low? What's your tires normal (max) psi?
Hmm. I don't have any experience airing down on a wider rim. Maybe someone else will chime in.

I run about 20 psi on the road. The Jeep is light, so using a chalk line on the tires will help in figuring out how much psi to run with your particular tire on the road.

Every time I have a tire store mount tires, they over inflate the tires. It will ride like a rock, and wear down the center of those expensive skins.
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Old 02-04-2012, 09:07 PM   #6
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Wow no kidding im running about 32psi and your right its crushing my kidneys. Haha. Yeah I will definetly try the chalk trick I forgot about that. Do you use one of those tire deflater tools? And do you have a mini air compressor you bring with you to air back up?
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Old 02-04-2012, 10:28 PM   #7
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Do you use one of those tire deflater tools? And do you have a mini air compressor you bring with you to air back up?
Yes, and yes. I was using a Harbor Freight portable compressor for over 3 years. It works good, but is kind of slow. I still have it for a back up.
I was going to buy a Viair on board air system, but I won a new Smittybilt large HD portable compressor at a Jeep Jamboree last summer. They have two, mine is the big one. It is over twice as fast as the HF pump...150 litres/min vs 70 l/m for most portables. So, I have been using it..... cause it was free! I can air up as fast as my buddies with OBA.
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Old 02-05-2012, 08:12 AM   #8
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Wow no kidding that's what ill have to pick up then. Right now I just use one of those slime roadside emergency inflators. It takes like 15-20 min a tire!
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Old 02-05-2012, 10:19 AM   #9
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Smitty sells the 2781 and the 2780 compressors. The 2781 is the larger one in the pic. The smaller Smitty is the same size as the Harbor Freight compressor in the pic below.
I think the Smitty 2781 sells for $150. I really want an OBA system, but this only cost me a couple raffle tickets, so I am using it for now.
I hope it lasts longer than my SB winch did.

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Old 02-05-2012, 10:24 AM   #10
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Looks decent dave, you'll have to let me know how it holds up for you. What happened with your Smitty winch? I was thinking about buying one but warn has a more reasonable priced winch line now.
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Old 02-05-2012, 10:44 AM   #11
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I think everyone has their comfort with air levels. We had sand rails for years, quads and side by sides and ran 8lbs in the rails and a little lower for the quads. But, we had beadlocks on all those so we had little worry about blowing a bead.

Running the Jeep which is obviously heavier and no bead locks I run 15lbs for typical crawling. Seems to provide a smooth ride and gives plenty of grip. Not sure going lower does much for that purpose but maybe in the snow as Dave says, it works better.

I use the Currie Deflator and the portable ViAir. Both work great! Airing down from 35 to 15 takes about 2 minutes per tire and airing up takes about 3 minutes per tire.

Good Luck,
Steve
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Old 02-05-2012, 11:04 AM   #12
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Nice ill have to do some looking around then before I purchase a better pump. How much they get you for the viair? I can live with 2-3 min per tire that's no problem at all. I have a air locker in The front, could I run that off of onboard air?
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Old 02-05-2012, 11:16 AM   #13
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I have 33x12.5x15" on a 8" rim. I air down to about 13-14 psi. But others in the group air down to as low as 10. No issues so far.

I have OBA in my cj via a York 210 engine driven compressor. It's delivers more air than any other system but is also the most expensive. A viair system varies in price but start in the $300 range. You might check eBay for a used them...they do pop up more than I would have thought.

As long as you have the correct pressure switch any OBA system cam be used for your air locker.
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Old 02-05-2012, 11:27 AM   #14
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Looks decent dave, you'll have to let me know how it holds up for you. What happened with your Smitty winch? I was thinking about buying one but warn has a more reasonable priced winch line now.
I don't know exactly what happened to the winch. I have not taken it apart to find out yet. It's the newer one with the 5hp series wound motor. It worked great for two years, then one day it made a funny noise and decided it would not spool in under any kind of load. It may be a simple fix, who knows. I replaced it with a used Warn XD9000i that is faster, and easier on the battery. I'm giving the Smitty to a buddy of mine that just bought a Cherokee. He is going to tear into it and find out what is broken. I will post the results on this forum somewhere, when that happens.
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Old 02-05-2012, 11:46 AM   #15
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Nice ill have to do some looking around then before I purchase a better pump. How much they get you for the viair? I can live with 2-3 min per tire that's no problem at all. I have a air locker in The front, could I run that off of onboard air?
The Viair was $199 from 4Wheel Parts - Viair Part 40043 - 400P Portable Compressor Kit by VIAIR

So far this has been a great pump! I was considering putting an onboard tank but being portable, using it for others as well seems to be good for my purposes. Plus, less weight and stuff to get in the way.

The Currie Deflator is about $30 - Currie Enterprises E-Z Tire Deflator - Tire Valve Deflator - Tire/Wheel Accessories - Wheels - by 4 Wheel Parts

Cheers
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Old 02-05-2012, 12:17 PM   #16
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Wow that's not a bad price at all! Thanks for the info ill have to log on 4wd later and check it out! Definetly need to get a faster pump that's for sure. Haha
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Old 02-08-2012, 09:00 AM   #17
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If you haven't got the compressor yet, we sell the 400P for $199 also with free shipping and no tax if shipping outside AZ.

400P - $199

We also came out with an economy OBA system, with just the basics to put an OBA on your Jeep. You can add a regulator to this setup for your lockers for an extra $30.

Economy 400C OBA System - $299

Pressure Regulator

Let us know if we can help you out at all.

David

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