The reasson to air down your tyres is not just for grip. If the tyres are at normal pressure and you hit a small sharp stone at speed, it will ripp the inside of the ply on the inside of the tyre and over time will cause the tyre to blow out when you drive at speed on the free way. Any time you get on a dirt road I would say deflate to 1.5 bar, eaven if you have road tyres on the Jeep. As sson as I get on a dirt road I deflate to 1 bar, but I have 33" BF A/T tyres on my Commander.
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I work off shore so that I can play Off road..lol
And the measurement device for finding the "bar" on your "tyre" ... do you keep it in the boot?
Mike
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2006 5.7L Limited, Inferno Red, QDII, and all goodies. Modified Superlift 4" lift-kit, B.F.G. 285/70R17 A/Ts (1.25" spacers), Aries tail-light guards, AVS ventvisors, KC Hilites off-road lights, and from 4xGuard: Belly Guard, Front Guard 4, Matrix brush guard with Receiver and Grill Hoop, Rear Diff Guard, Rear Guard 2, Rear Sliders, and Side Guards.
Well, after spotting a couple of XK's over obstacles one guy had a bunch of trouble making it and I was confused at to what the problem was. Then it hit me he said earlier he didn't air down what a difference it makes uh. During the first day we headed down some long rocky service roads. About an hour into it I got fed up and air downed to 25PSI and instantly my ride smoothed right out and the family was happy again and the wife just wanted to know why I didn't do it an hour ago.
1.5 barrs = 21.7 lbs/in^2
1 barr = 14.5 lbs/in^2
Arrie is our friend in South Africa, so I guess they use barr as their unit of pressure over there. Actually, I wonder why they don't use kilopascals, but it's just a factor of 10.
2007 Commander Overland / 4" SuperLift / 285/70R17 Cooper Discoverer ST Maxx / Rusty's adjustable rear UCAs / Carolina Driveline front drive shaft / Flashpaq / DRLs & Tilting Mirrors / Autolite Iridiums / Cobra 29LX Chrome LE CB & Firestik antenna / Rear fog lights / Mopar Grille Guard with HID driving lights
"4 wheel drive does not mean 4 wheel stop!" -Lee Goldberg, WABC TV weatherman
I air down to lower than 15 psi when driving on soft dry sand ,, I also put it on around 10 psi when going to extreme soft sand and tough areas, and even with such pressure we sometimes get stuck
Second Jeep Commander ,,,, Current
2007 XH (International model), Green Metallic, Limited, 5.7L HEMI, Quadra-Drive II
Spidertax 1.5" wheel spacer, Flowmaster 50 SUV muffler, Sylvaniya Ultra bulbs for high beam and fog lights, K&N replacement filter
First Jeep Commander,,,, Gone
2007 XH (International model), Light Graystone Pearl, Sport (Base model) , 4.7L Quadra-Trac II.
http://i247.photobucket.com/albums/g...255/sign-1.jpg
Don't you risk breaking the bead at such low pressures...?
2007 Commander Overland / 4" SuperLift / 285/70R17 Cooper Discoverer ST Maxx / Rusty's adjustable rear UCAs / Carolina Driveline front drive shaft / Flashpaq / DRLs & Tilting Mirrors / Autolite Iridiums / Cobra 29LX Chrome LE CB & Firestik antenna / Rear fog lights / Mopar Grille Guard with HID driving lights
"4 wheel drive does not mean 4 wheel stop!" -Lee Goldberg, WABC TV weatherman
no your still good down to 15PSI but I wouldn't go much lower then that with out bead locks IMOOriginally Posted by lekmedm
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