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tyre pressure dilemma

Submitted: Wednesday, Nov 02, 2005 at 12:20

gonna

Just finished a trip during which time I travelled the Plenty, Donohue and Walkers Crossing. I got 3 stone punctures, but what made this interesting was that every time I had them repaired at Boulia,Birdsville and Innamincka I was told I was running the wrong pressure so would adjust accordingly.

As a result I ran the following pressure, as advised , in my Bridgestone Duelers, 265/70 R16's AT's.
36, 40, 32( compromise as I was told 28) and 35. I got punctures on all pressures except 35 but most of the stony travel was over by then except for the Marree to Oodnadatta leg
I was carrying about 600kg's in my Triton Twin cab GLS V6.

What do reckon ?
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AnswerID: 137419   Submitted: Wednesday, Nov 02, 2005 at 12:43

Member - Andy Q (VIC) replied:

G'day gonna, yeah man I have travelled the exact same roads but I gotta say I didn't have any puntures on those roads. Only puncture in 14000klm , I ran 38psi the whole trip and 34 in the camper van. Tyres were Hankook MT

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mightyQ
Reply 1 of 7
FollowupID: 391108   Submitted: Wednesday, Nov 02, 2005 at 12:55

Member - Andy Q (VIC) posted:

Sorry gonna, Vehicle was GQ 4.2 petrol carring about 2tonne, maybe I was just lucky, we certainly didn't push it, we had 3 months to travel at our leisure. Now I have a 4.2 Diesel with Brigdestone Duelers good tyres for the road, haven't been away for any length of time yet!
Hope this helps in some way
andy

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mightyQ
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AnswerID: 137429   Submitted: Wednesday, Nov 02, 2005 at 13:12

Member - MrBitchi (QLD) replied:

Personally I run about 30PSI on gravel. (Cooper AT's). There is no majic number. Some trips you get flats no matter what. How much tread you have seems to be a big factor as well. Less tread = more punctures.

Cheers...........

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gawk; grep; unzip; touch; finger; mount; fsck; gasp; yes; umount; sleep!!
Reply 2 of 7
FollowupID: 391145   Submitted: Wednesday, Nov 02, 2005 at 17:14

JW posted:

John,
Two questions.
1. What size Coopers? I have 265/70/16 STs on my Patrol and have been wondering about pressures.
2. Where did you get your flag and how is it mounted? I need one for early next year but I am not too keen to drill a hole into my alloy bar.
Regards
Jon W
FollowUp 1 of 3
FollowupID: 391170   Submitted: Wednesday, Nov 02, 2005 at 19:25

Member - MrBitchi (QLD) posted:

1. 265/75/16 ATs. Run 36/40 on sealed when loaded, 36/36 unloaded, 28/30 on gravel, between 15 and 20 in sand, depending on how soft it is.

2. Its a telescopic Squid Pole. Got my local tackle shop to order it in for me. Apparently quite common in southern states. It's ocky strapped to the spare wheel :-) Flag is a piece of orange material the missus had in her sewing kit.

Cheers........

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gawk; grep; unzip; touch; finger; mount; fsck; gasp; yes; umount; sleep!!
FollowUp 2 of 3
FollowupID: 391300   Submitted: Thursday, Nov 03, 2005 at 17:13

JW posted:

Many thanks John. I'll see if I can get one up our way.
Jon W
FollowUp 3 of 3
AnswerID: 137436   Submitted: Wednesday, Nov 02, 2005 at 14:06

Member - Banjo The First (SA) replied:

Indeed to the above - slower speeds and reduced vehicle looading are big factors - 28 Front - 33 Rear on my BFG's has looked after me very well over those sorts of terrain... and I take it easy - those that scoot along quickly, pay scant attention to the stones and have a heavy load to boot will gain little from tyre pressure theory - the answer seems to lay in a mix of the lot. In your case, it could have been simply a "bad run".... we've all had some of that.

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By the time I'm too old to go bush, I'll have all my gear set up just right !
Reply 3 of 7
AnswerID: 137445   Submitted: Wednesday, Nov 02, 2005 at 14:59

signman replied:

After many years of rallying and off road (safari) motor sport- you're also more prone to get more punctures in the wet than dry roads.
Apparently the wet stones tend to be 'lubricated' and will penetrate easier than the friction of the same when dry .
It's only a theory- but from experience I would believe it.
Reply 4 of 7
FollowupID: 391129   Submitted: Wednesday, Nov 02, 2005 at 15:16

scoof posted:

I have had a puncture with 38psi and the guy at the pink road house told me to run 25 psi so I did and I still got another punture.I have traveled that same road a couple times and never had any trouble.Some times you getem and sometimes you miss out.
Cheers Scoof
FollowUp 1 of 2
FollowupID: 391210   Submitted: Wednesday, Nov 02, 2005 at 23:06

Member - Davoe (Widgiemooltha) posted:

Not a theory at all and you dont need a rally car to suffer either. Minesites will stop the trucks running during heavy rain if it starts flooding the floor for this reason
you dont need to leave perth to go bush
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You dont need to leave Perth to go bush
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AnswerID: 137459   Submitted: Wednesday, Nov 02, 2005 at 16:48

Member - Phil G (SA) replied:

I run about 25psi on gravel roads. As of last week, I've had my first puncture in 6 years - slow leak due to a tiny hole in the sidewall. It works for me, and the people I go away with.

Those Bridgestone Duellers in that size may be a little on the soft side. But like the others said, plenty of tread and not much weight or speed do help.

Cheers
Phil
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AnswerID: 137472   Submitted: Wednesday, Nov 02, 2005 at 17:36

Wayne (NSW) replied:

gonna,

A lot will also depend on how new the tyres are. A worn tyre is more likely to get a puncture than a tyre with plenty of tread.

Despite what the locals say I still run 38psi all round. Maybe if the locals have there vehicles fully loaded like we have when we travel they might increase the tyre pressure as well. A vehicle that is empty is has less chance of a puncture that a heavy one.

Speed would also increase the chance of punctures and so will just bad luck.

Wayne
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FollowupID: 391158   Submitted: Wednesday, Nov 02, 2005 at 18:30

gonna posted:

Thanks for all the replies.
My tyres were almost new.
This was my 4th major trip over 9000k's over mostly dirt/gravel/stoney roads but the most puntures--maybe the bad run theory is right !?
One trip (1994)was 18000 k's mainly through WA and SA deserts with only one puncture using Yokohamas .I had a baby on board so took it easy.

My wife reckons she now has the proof to back her theory and some of you blokes seem to be right----I need to slow down.
FollowUp 1 of 1
AnswerID: 137580   Submitted: Thursday, Nov 03, 2005 at 09:34

P.G. (Tas) replied:

Hey Gonna, I had that ake/size tyre on my Patrol when I bought it and had the same questions.

I contacted Bridgestone directly and was told A/T's maximum pressure for their rated load is 36psi cold, and at that pressure will carry far more than your vehicle will!

Hope that helps, I certainly wouldn't be going above 36psi, under ANY circumstance.

Cheers
Reply 7 of 7