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Unread 06-19-2014, 09:44 AM   #1
Kdailey13
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2011 JK Wrangler 
 
Join Date: Dec 2013
Location: Bay Village, OH
Posts: 56
What do i air down to?

I recently put 35x12.5 mt/r kevlars on my 17x9 rims and i was wondering what psi i should air down to without worrying about added risk of disturbing the bead or the tire on the rim.

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Unread 06-19-2014, 09:54 AM   #2
wilson1010
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1999 XJ Cherokee 
 
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Location: Cincinnati Ohio
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Tires do not debead above 15psi unless you are in an accident. Between 6psi and 15 psi they can debead given the proper conditions. With the wheels straight ahead, i have never debeaded a tire above 8psi. With the wheeels turned and pushing our local clay downhill, I can intentionally debead any tire at 8psi or below. It only takes about 300 pounds of resistance from the ground to pull the bead off at 8psi.

You double your contact patch going from 32 to 16. Four time going from 32 to 8.

Learn how to re-bead a tire if you are going to go below 12-15. Expect to re-bead a tire if you go below 6. It is not as easy as it looks when you are at the bottom of a hill with your rig at a 20 degree downward angle, stuck, and the rim has 10 pounds of clay in it.
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Unread 06-19-2014, 09:55 AM   #3
222Doc
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well on my 15x8s with 35x12.5 normal air down is 10psi and i can push it as low as 7/8. though i have had a bead slip at 7. I think from 10-12 you should be ok anything over 12 is about like not airing down anyway. I run 27 on the road. I mean anything can happen it the way it is.
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Unread 06-19-2014, 10:08 AM   #4
Kdailey13
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Cool thanks a lot guys!
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Unread 06-19-2014, 10:30 AM   #5
olliehopnoodle
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1982 FSJ Cherokee 
 
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Location: mesa, az
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I typically go down to about 13. Never lost a bead. BFG 35's on 15" rims. Arizona wheel'n. Really helps on the wash board roads. I get decent bite driving over rocks. Start around that and see if it works for you.
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Unread 06-19-2014, 10:58 AM   #6
Ross
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2001 TJ Wrangler 
 
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I had 10" rims and could lose air around 10 psi, I now have 8 inch rims and haven't lost air at that level. I have 15 inch rims (diameter), not sure if that would make a difference or not.
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Unread 06-20-2014, 10:09 AM   #7
Kdailey13
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2011 JK Wrangler 
 
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Location: Bay Village, OH
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Cool ill probably try 15-16 and work my way down
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Unread 06-22-2014, 07:14 AM   #8
jeepdaddy2000
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We run a lot of sand and for shoving a recovery rig out there, we run 15-18 LBS with no issues. My biggest dislike is takng the time to air back up. An F350 running 50 LBS of air in the tires can take some time to get back to highway pressures, a must if your sand camping and hauling a trailer.
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Unread 06-22-2014, 08:20 AM   #9
JIMBOX
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2008 JK Wrangler 
 
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I rarely air-down, sand/rocks-

If I have to in snow, my STAUNS are set to 18psi--nuff

JIMBO
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Unread 06-22-2014, 11:04 AM   #10
strvger01
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1966 CJ5 
 
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i had all my tires tubed. would run all weekend at 5-8psi. just aired them back up for the sunday trip back home. one thing that might have helped as well were that they were 235/85x16 E-rated tires with stiffer sidewalls. but the ride both on the trail and the road were good. just need to calculate for the correct psi for the dd ride comfort.
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Unread 06-22-2014, 12:42 PM   #11
Kdailey13
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Awesome thanks guys!
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