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29-10-2014
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Time to tinker
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Join Date: Jul 2002
Location: www.wooders.com.au
Posts: 10,682 What Jeep do I drive?: CJ
Likes: 134
Liked 448 Times in 233 Posts
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Quote:
Originally Posted by bleetnblurt
does anyone know why tractors use water in the tyres ?
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Water = MUCH lower COG and better traction. But not a great idea with stock small Jeep axles
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29-10-2014
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Full Flexer
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Join Date: Sep 2013
Location: Forrestfield, WA.
Age: 72
Posts: 1,132 What Jeep do I drive?: JK
Likes: 272
Liked 542 Times in 304 Posts
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Quote:
Originally Posted by Wooders
Water = MUCH lower COG and better traction. But not a great idea with stock small Jeep axles
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May end up bouncing along like a tractor as well.
It would look like one of those bouncy suspension American cars like you see on those ridiculous video clips
__________________
Driving Miss Monogamous.
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30-04-2015
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Senior Newbie
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Join Date: Mar 2015
Location: Carlisle WA
Posts: 56 What Jeep do I drive?: XJ
Likes: 0
Liked 5 Times in 5 Posts
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Quote:
Originally Posted by bleetnblurt
does anyone know why tractors use water in the tyres ? how hot can sand get ?
wide tyres are good for soft sand , but horrible for fuel cost on road , but I guess no one keeps there standard tyres or could be bothered to change them over on a weekend. (or a Friday night) in the words of Dr Smith on lost in space :
" OH THE PAIN THE PAIN"
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Extra weight for more traction when pulling
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30-04-2015
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Full Flexer
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Join Date: Feb 2008
Location: Toowoomba
Posts: 526 What Jeep do I drive?: JK
Likes: 1
Liked 2 Times in 2 Posts
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Tractors add water to help gain traction with weight as they have enough torque.
On hard bitumen tyres with higher pressure have less resistance but pressure needs to be correct wear fuel economy.
On beach hard tyres dig sink in creating drag but aired down the larger foot print helps float over sand so less resistance easier drive less stress on vehicle.
Sent from my GT-N7105 using Aussie Jeep Offroad mobile app
__________________
JKU CRD Auto, AEV Front Bar 285 70R 17 tyres- CRDSTU Lift kit.
- just do it - no guts no glory.
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30-04-2015
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Newbie
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Join Date: May 2008
Location: Ellenbrook Perth
Posts: 356 What Jeep do I drive?: JK
Likes: 37
Liked 25 Times in 21 Posts
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Like it's been said above the main benefit is the increase length of the contact patch not the widening that makes the big difference. This is on flat surfaces though. When going over rocks and uneven surfaces the tyre actually wraps around over the obstacle increasing the benefit even more.
Not only does this give better traction and grip but it also reduces tyre damage.
I'm surprised you guys run your pressures so high. Off-road in soft sand I usually run 10-12psi and will drop down to 8psi if I have to. This is on 15" and 17" rims. I've had my old KJ with 30s running 17s rims and still had them that low with no problems. When running lower profiles I believe the rule is that you should stay above 65% on the aspect ratio.
__________________
If a shortcut wasn't challenging, it would be called the way.
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01-05-2015
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Just Real Jeeps Club
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Join Date: Dec 2009
Location: Brisbane
Posts: 1,594 What Jeep do I drive?: CJ
Likes: 3
Liked 80 Times in 46 Posts
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The lower you can go the better offroad, I run 6psi in my 37" MTR's on my CJ to make the tyres work well
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03-05-2015
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Full Flexer
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Join Date: Oct 2009
Posts: 1,142 What Jeep do I drive?: JK
Likes: 52
Liked 544 Times in 264 Posts
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When I did the Canning Stock Route last year I used Goodyear Wrangler MT at 18 - 20psi cold. Any higher and the constant corrugations were felt. Very badly. Ave speed was about 30kph. Terrain varied from soft sand, sand hills (rather than dunes) rocky, etc. JKU loaded to the hilt. No punctures and not stuck once. I usually run the tyres @28-30 psi on trips into the bush and loaded to the hilt and towing trailer. No punctures.
Brother used Goodyear Duratec's AT (told they were the duck's guts) on the Canning and he had about 5 punctures... I lost count. Ran his tyres at same pressures and the punctures were all sidewall.
I have found the MT to be best On Road @35psi but wear a bit on the tyre edges but most comfortable. Anything less than 30psi and the JKU feels unstable at >80kph... wallows on the road like a pig!! Air down to what u like really, provided the tyres can take it AND u adjust your speed accordingly.
The other thing about airing down, especially on corrugations, is that it will help your suspension cope better. Just my tuppence worth.
Last edited by humdingerslammer; 03-05-2015 at 08:15 AM.
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