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Author Topic: Tyre Pressures for dirt roads.  (Read 11128 times)

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Offline McGirr

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Tyre Pressures for dirt roads.
« on: May 04, 2015, 09:38:11 PM »

Just curious on tyre pressures.

Did some exploring around Warburton and got home washed the dirt off the car and the next morning a flat rear tyre, first flat in 7 years. Any way put a plug in it today as there is no tyre repair place here. There was a sharp rock that went through the tyre in a lug in the main tread. The tyres are reasonably new.

The tyres had 37 psi in the rear and 34 psi in the front.  Being based here all I do is drive on dirt roads with the occasional Rocky track. What would be the ideal psi for the front and rear tyres. The tyres are hankook all terrain tyres. You can see the tread slowly being worn traveling on the dirt roads with the odd lugs being chipped here and there.

Once these tyres have done their job I will look at upgrading to some tougher tyres.

Mark
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Offline Mik01

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Re: Tyre Pressures for dirt roads.
« Reply #1 on: May 04, 2015, 09:41:47 PM »
Did the same on my first off-road dirt driving. Now deflate to around 24. But that's for dirt, rock and mud etc
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Offline broncos11

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Re: Tyre Pressures for dirt roads.
« Reply #2 on: May 04, 2015, 09:43:15 PM »
Just watched Your4x4 tonight and they were doing the GBR and they all put 24 psi in and had travel speed around 80kmh to best cope with corrugations. Probably a but more severe then your average driving around home, so maybe high 20's????
Hope your going well

Dave
« Last Edit: May 05, 2015, 01:18:25 PM by broncos11 »
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Offline Kelvo

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Re: Tyre Pressures for dirt roads.
« Reply #3 on: May 04, 2015, 09:43:33 PM »
I normally run 20% less than my road pressure.

Remember different vehicles have different 'starting' pressures so a universal pressure will not suit all.
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Offline Steffo1

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Re: Tyre Pressures for dirt roads.
« Reply #4 on: May 05, 2015, 08:34:10 AM »
Quote from: broncos11 on May 04, 2015, 09:43:15 PM
Just watched My4x4 tonight and they were doing the GBR and they all put 24 psi in and had travel speed around 80kmh to best cope with corrugations. Probably a but more severe then your average driving around home, so maybe high 20's????
Hope your going well

Dave
Did the GBR, Gunbarrel & some in '05 & ran 28 front, 26 rear. On the GBR I found 80-90 kmh was the best suspension harmonics for my vehicle & the Gunbarrel was anywhere from 2-70+ kmh  ;D
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KingBilly

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Re: Tyre Pressures for dirt roads.
« Reply #5 on: May 05, 2015, 08:41:26 AM »
28 cold all round for dirt roads.  Try to stay under 85 kph

KB
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Offline fishfinder

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Re: Tyre Pressures for dirt roads.
« Reply #6 on: May 05, 2015, 08:56:38 AM »
Quote from: KingBilly on May 05, 2015, 08:41:26 AM
28 cold all round for dirt roads.  Try to stay under 85 kph

KB
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Offline Redcherokee

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Re: Tyre Pressures for dirt roads.
« Reply #7 on: May 05, 2015, 08:57:45 AM »
What's that old rule?  Measure the pressure cold, and then again when they are hot.  Someone will be able to confirm the desired difference. Is it 5?.  Anyway, that sort of methodology sounds good.

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KingBilly

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Re: Tyre Pressures for dirt roads.
« Reply #8 on: May 05, 2015, 10:17:43 AM »
Quote from: Redcherokee on May 05, 2015, 08:57:45 AM
What's that old rule?  Measure the pressure cold, and then again when they are hot.  Someone will be able to confirm the desired difference. Is it 5?.  Anyway, that sort of methodology sounds good.

Difference of 4 psi between cold snd hot but that is more applicable to black top and vehicle loads

KB
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Offline chester ver2.0

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Re: Tyre Pressures for dirt roads.
« Reply #9 on: May 05, 2015, 10:26:44 AM »
Mcgir

On the mines which are all dirt roads about the same quality as you experience 2 to 30 depending on loaded or not was the normal numbers
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Offline rossm

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Re: Tyre Pressures for dirt roads.
« Reply #10 on: May 05, 2015, 11:00:01 AM »
Gidday

I have been in that country on a tagalong and out very experienced guide recommends a minimum of 10 per cent below normal highway cold pressure. If it is very rocky and you are not heavily loaded 15 per cent is not ruled out.

Just have to watch the speed . But from experience you are not likely to barrelling along.

I envy you, there is some great country out in that region.
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Offline austastar

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Re: Tyre Pressures for dirt roads.
« Reply #11 on: May 05, 2015, 11:29:27 AM »
Hi,
    For me, highway is f 60, r 70.  I halve that for gibber and corrugations.
Cheers
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Offline Pog

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Re: Tyre Pressures for dirt roads.
« Reply #12 on: May 05, 2015, 11:39:37 AM »
Quote from: austastar on May 05, 2015, 11:29:27 AM
Hi,
    For me, highway is f 60, r 70.  I halve that for gibber and corrugations.
Cheers

Are you talking psi?
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Offline Azz

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Re: Tyre Pressures for dirt roads.
« Reply #13 on: May 05, 2015, 12:47:34 PM »
28 psi for out on the bush, extended gravel touring.

Will drop to less when its muddy.
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Offline swanny

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Re: Tyre Pressures for dirt roads.
« Reply #14 on: May 05, 2015, 12:53:51 PM »
26 to 28 psi for me depending on weight, I think terrain is also a factor, if the road is nice and firm (gravel type road) then I run what is mentioned or even a touch higher, however if its a bit sticky, wet, and muddy I tend to lower them a touch more and back my speed off.

I reckon dropping your speed is pretty important when lowering tyre pressures....

Swanny
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Offline jk

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Re: Tyre Pressures for dirt roads.
« Reply #15 on: May 05, 2015, 09:40:46 PM »
As said above weight is always going to be a factor, but on the Cape York Trips we ran about 25 to 26lb front and rear all the way from Laura to the tip and back.

After two trips to the top and back to Brisvagus the tyres showed no sign of unusual wear and we had no flats or punctures, in fact someone commented that they didn't look like they had done much off road work, to which I replied..............nah, only about three to four thousand km worth  :cup:

Cheers
Johnno
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Offline dales133

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Re: Tyre Pressures for dirt roads.
« Reply #16 on: May 05, 2015, 09:53:46 PM »
So what do you do with your camper trailer/van tyres? What pressures do you usualy run them at on and off road?
I'd imagine weights a factor but generaly
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KingBilly

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Re: Tyre Pressures for dirt roads.
« Reply #17 on: May 05, 2015, 09:57:19 PM »
Normally run the camper at the same pressures as the tug. Particularly important in sand.

KB
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Offline jk

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Re: Tyre Pressures for dirt roads.
« Reply #18 on: May 05, 2015, 09:58:38 PM »
Usually the same as the 4x4, if the 4x4 is approximately 3t loaded over 4 tyres at 25psi then the camper is approximately 1.5t over 2 tyres at the same pressures ! But that's just me  ;D
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Offline edz

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Re: Tyre Pressures for dirt roads.
« Reply #19 on: May 05, 2015, 10:32:28 PM »
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Offline V8CRSA

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Re: Tyre Pressures for dirt roads.
« Reply #20 on: May 05, 2015, 10:39:53 PM »
On the trip we just did we ran 25ish in the front and 28ish in the rear,and all tyres have come out of it in great condition.
Kamper was also around 25psi

Matt
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Offline dales133

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Re: Tyre Pressures for dirt roads.
« Reply #21 on: May 05, 2015, 10:50:14 PM »
Cool thanks guys
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Offline grafy82

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Re: Tyre Pressures for dirt roads.
« Reply #22 on: May 05, 2015, 10:50:47 PM »
We ran 28psi all round, including camper on our last trip to Weipa. They were already old tires but did not show any bad wear and no punctures after about 2000 kms of off road.
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Offline fuji

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Re: Tyre Pressures for dirt roads.
« Reply #23 on: May 06, 2015, 01:34:30 AM »
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Offline GanG

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Re: Tyre Pressures for dirt roads.
« Reply #24 on: May 06, 2015, 09:00:39 PM »
When I was working in arnhem land 2013 and on our road trip in 2009 up there I ran 22psi all round with a moderate load on the vehicle and towing a light trailer
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