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Dunecrawler 11-08-2010 03:35 AM

Air down with 20"?
 
So, I do a fair bit of driving in deep sand. Used to air down to about 12 PSI on my '06 WK. How about on the 20" 265/50's?
I have never had the lower profiles on 4x4, so no idea how to do this.

Ken Jacobs 11-08-2010 07:52 AM

Re: Air down with 20"?
 
I have never gone down below 15 psi in my 03 WJ for fear of breaking the bead. I'm surprised that you can go down to 12 without any problem.

jeep2011 11-08-2010 10:09 AM

Re: Air down with 20"?
 
I never go down lower than 20psi when driving on the beach. I have not seen any difference between 15-20psi. You should be fine at 20psi for sure with the 20's

moosehead 11-08-2010 10:23 AM

Re: Air down with 20"?
 
DC, you just may want to take it slower if sand is mixed with rock or when you may be transitioning back to pavement. Don't want to ding up those nice rims.

MeanDean 11-08-2010 11:20 AM

Re: Air down with 20"?
 
I would tread lightly (pun intended) here. IMO, anything below 15 psi on 20" wheels and you risk breaking the bead as Ken mentioned or damaging the wheel on a rock or debris.

This is probably why Jeep insists on 18" wheels for their off-road packages, and it makes perfect sense to me. 20" tires are made for the street.

Dunecrawler 11-08-2010 01:19 PM

Re: Air down with 20"?
 
Rubber has come off the rim a couple of times though, but that was my own fault. It is fine at 12 PSI all day long (even in 115 degree temp).
I take it down to 9 or 10 when I get stuck, but that is only to move it by a few meters.

Quote:

Originally Posted by Ken Jacobs (Post 297760)
I have never gone down below 15 psi in my 03 WJ for fear of breaking the bead. I'm surprised that you can go down to 12 without any problem.


Dunecrawler 11-08-2010 01:23 PM

Re: Air down with 20"?
 
Quote:

Originally Posted by moosehead (Post 297825)
DC, you just may want to take it slower if sand is mixed with rock or when you may be transitioning back to pavement. Don't want to ding up those nice rims.

Yeah, obviously thanks. Not alot of rocks and stones around here. This is for well behaved driving over sand dunes to get to a camp site. We air back up the moment we get off the sand. But I think with the 20" I will not bother to air down. Just not enough sidewall, but thanks guys 20 PSI as a minimum sounds good on the 20"

ScottCJeep 11-08-2010 02:40 PM

Re: Air down with 20"?
 
Quote:

Originally Posted by MeanDean (Post 297856)
I would tread lightly (pun intended) here. IMO, anything below 15 psi on 20" wheels and you risk breaking the bead as Ken mentioned or damaging the wheel on a rock or debris.

This is probably why Jeep insists on 18" wheels for their off-road packages, and it makes perfect sense to me. 20" tires are made for the street.

I think I heard that the reason for 18" wheels with off road package is because the quadra-lift is not compatible with the 20" wheels...I don't think there is enough clearance in certain modes.

Dunecrawler 11-08-2010 03:02 PM

Re: Air down with 20"?
 
QL is not restricted to 17/18" only. Overland comes standard with 20" and QL. 18" is an option. Also, diameter of 18 and 20's are within 1/2 inch of each other

Marlin 11-08-2010 05:18 PM

Re: Air down with 20"?
 
I deflate to 20psi on my 22" tires when running soft sand.
Careful though as others have mentioned, tree roots and rocks while deflated are asking for trouble.

So, unless I deem the sand very soft, I try not to deflate and just use HEAPS of throttle! :D

Dunecrawler 11-09-2010 02:01 AM

Re: Air down with 20"?
 
Thanks Marlin, was actually waiting for your input.

Marlin 11-09-2010 02:10 AM

Re: Air down with 20"?
 
Could have just asked me via PM mate :)

Remember, plenty of pics of your new Jeep on the beach...... when it arrives! :sleepy:


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