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how much to air down?

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Old Mar 22, 2009 | 07:19 PM
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From: Tucson, AZ
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Default how much to air down?

Hey im not exactly sure how much to air down, im told usually 10-15 psi, but see i have a 15 by 7.5 rim with 32x11.5 tires, i dont wanna air down too much since the rim is small, and i dont have beadlocks.... any suggestions
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Old Mar 22, 2009 | 07:35 PM
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I have seen someone running your same setup go down to 12 and be fine.
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Old Mar 22, 2009 | 08:18 PM
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depends what your doin i would think.
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Old Mar 22, 2009 | 08:21 PM
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12 would be good then. well how much should i take out if im doin some rock crawling.
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Old Mar 22, 2009 | 09:51 PM
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Lowest I have ever went is 15, and that is on the rocks in CO. I haven't had any issues and most of the "gurus" I go with say that is fine.

Last edited by afbond03; Mar 22, 2009 at 09:54 PM.
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Old Mar 22, 2009 | 11:19 PM
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oh really, ok well thats fine yeah i heard 15 was the ideal psi but i jus didnt want to go too low since my rim is not that wide, dont wanna have a popped out rim and tire in the middle of the texas desert, lol
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Old Mar 22, 2009 | 11:22 PM
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in the sand, you want as low as possible. i run about 8psi in the sand.
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Old Mar 22, 2009 | 11:29 PM
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yeah i do hava alot of sand over here, but would i run the risk of my tire popping off with 8 psi, my rims are only 7.5 and tires are 11.5.
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Old Mar 22, 2009 | 11:34 PM
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i used to run about 10 psi with that setup, bet i could have gone lower if i wanted
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Old Mar 22, 2009 | 11:35 PM
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I was also wondering how far to air down on my 235/75/15's AT's the lowest i have been so far is 15 and it seemed to be fine for the mud/sand since fla is full of it lol......
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Old Mar 22, 2009 | 11:52 PM
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Originally Posted by ktmracer419
i used to run about 10 psi with that setup, bet i could have gone lower if i wanted
oh really wow and you never had any issues with that set up
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Old Mar 23, 2009 | 07:47 AM
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don't forget tho, tire sidewalls have a lot to do with it. if you have a heavy sidewall that doesn't flex much, you can go lower, as with new tires will be more stiff as well.

what tires are you running? how many ply is the sidewall?
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Old Mar 23, 2009 | 09:02 AM
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Originally Posted by studmuffin
yeah i do hava alot of sand over here, but would i run the risk of my tire popping off with 8 psi, my rims are only 7.5 and tires are 11.5.
i run 8psi with 8" rims and 10.5" tires
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Old Mar 23, 2009 | 10:47 AM
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the tire has alot to do with it.

my 32's were kumho mt's

i have run 37x13.5 bogger on 10" wheels at 6 psi

37x12.5 creepy crawlers at 5 spi on an 8" wheel

36x 12.5 swamper tsls couldnt hold a bead at 10 psi for some reason on an 8" wheel

36 x 13.5" iroks at 5 on a 8" wheel, (2 on the beadlocks)
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Old Mar 23, 2009 | 10:57 AM
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From: Tucson, AZ
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well im running bf 32, not sure how many plys they have, is that good?
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