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Unread 06-18-2013, 09:36 PM   #1
kaleo333
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2005 KJ Liberty 
 
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On/off road tire pressure

I saw some info about tire pressure on the street versus the trail, but it seems specific to each tire. What should I be running on and off-road on my 245/70/16 Goodyear silent armor's that wouldn't pop off the bead to wear tread unevenly?

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Unread 06-19-2013, 08:07 AM   #2
streetglideok
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Its partially dependent on your tires, and partially dependent on your needs. Sand you need less air than other things. 35psi works for some tires on road, but 30-35 psi is a better range considering some of us have slightly bigger than stock tires,lol. Offroad, a lot of guys run 20psi with no issues, and some drop to 15psi. Since you're running wider that stock tires on stock wheels I assume, you're less prone to popping a bead than someone with the 225/75r16 tires. If you pop the tire off the bead, its not an issue of tire wear, you lose all the air, and face a problem of getting the tire to seat and hold air again.
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Unread 06-19-2013, 08:19 AM   #3
kaleo333
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I'm actually running these tires on new wheels from procomp. But they still have the same dimensions. Would 20-25 be low enough to feel a difference without popping them off the bead?
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Unread 06-20-2013, 06:33 AM   #4
jedi105
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I believe there is some information on Jeeps website about tire pressures and the different terrains. I know 16 lbs is pretty optimal for sand and I havent been in the mud yet so I'm not sure of that. I have stock P235 16's so I'm not sure for other size tires.
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Unread 06-20-2013, 08:46 AM   #5
streetglideok
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Experiment, that's all you can really do. Try 20psi when going down the trails here, see if they tame the washboards on old stage/gold camp roads. I keep a 12v air compressor in the back at all times, so I can air them back up. Some guys get CO2 tanks to refill their tires too.
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Unread 06-20-2013, 09:05 AM   #6
kaleo333
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Perfect I was actually going up mt.baldy with a friend tomorrow. And I also have a little six minute tire filler, I just wanted to make sure I wasn't going low enough to pop off a bead thanks for the info
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Unread 06-20-2013, 01:33 PM   #7
streetglideok
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Let me know how the trail is up to Mt Baldy. I once heard it was a little nasty for a stockish vehicle, though yours is lifted. Be careful, won't take much to light the forest up in that area.
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Unread 06-20-2013, 01:48 PM   #8
kaleo333
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Yeah I ran in it my kj with a wj and a wrangler about 2 weeks ago and it really wasn't bad for any of us. We took a wrong turn and got on something harder but never had issues even on the lowest jeep, the wj. This time we'll hopefully stay on baldy and it'll be better since we'll be aired down. The wrangler actually spun out on some washboards with their yires at 35psi...
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Unread 06-20-2013, 02:37 PM   #9
tjkj2002
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Depends on what tires you are running and rim width.

Narrow rims will allow you to air down lower,so say you have 245's up to 265's LT mount them on a 7" rim and you can air down to 10psi-12psi without much worry.P metric tires I'd never go below 22psi-25psi since there sidewalls are very weak.


When I was running 265/75R16 Truxs MT's mounted on a 7" rim I ran 43psi on the street and 12psi offroad.Now with 35x12.50x15 MT/R K's on a 8" rim I go to 10psi offroad and 27psi on road.I could go down to 8psi offroad without worry.If I had the $$$ to get the Rock Monster double internal beadlocks I could go down to 5-6psi without any issues.


Want a trail in the same area to test your KJ do Eagle Rock,it's also just off of Old Stage Road,it's been tamed down in some spots but got alot harder in others over the years.

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Unread 06-21-2013, 08:23 AM   #10
kaleo333
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I currently run 16x8's so I'll probably just go with like 25 psi and see if that's a big enough difference.

And I'll definitely look into running eagle rock. Probably won't go today as my friend is his stock wj will be following...
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Unread 06-21-2013, 07:38 PM   #11
tjkj2002
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Yeah a 8" rim and P-metric 245's do not allow you to air down very much.Go to a 7" rim with LT 245's and you'd be able to go to 10psi-12psi without any issue.The difference is night and day when compared to even 25psi.
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Unread 06-22-2013, 10:58 AM   #12
olliehopnoodle
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20lbs should be fine, 15 would probably work too. Only way to know is to try. Just make sure you don't try to drift the corners
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Unread 06-22-2013, 11:18 AM   #13
kaleo333
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Just got back from baldy and my friend and I ran about 25psi and it felt a little better but I was too afraid to go lower and risk having to re-seat a tire.
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Unread 06-23-2013, 11:29 AM   #14
olliehopnoodle
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If you are not driving fast you should have no issues at 15.
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82 Cherokee WT - SOA/SF/agr box/Borgeson ujoint steering shaft/401/performer/holley TA/HEI/BeCool/727/np208/d44(aussie)/amc20(ARB)/BFG 35X12.5/Corbeau Moab Seats/RCI 6point Harness,Hella Aux lights/tuffy console/killer32 slider bars/custom bumpers and roll bar/Alpine head unit/amps/speakers 2002 Liberty Limited Early edition - Basically stock
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Unread 06-23-2013, 11:41 AM   #15
kaleo333
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Next time I go up, I may try something a little lower but the miles and miles of washboard roads can be tiring too slow...
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