Tyre pressures

Submitted: Wednesday, Apr 14, 2004 at 09:30

ThreadID: 12028 Views:1539 Replies:8 FollowUps:4

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Cruisin

Hi all

What are the correct tyre pressures for travelling on corrugated roads in a fully loaded vehicle for speeds up to 80km/h with some gentle cornering involved ??

Cheers

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Reply By: Mister Jelly Bean - Wednesday, Apr 14, 2004 at 09:47

Wednesday, Apr 14, 2004 at 09:47

Personally, I wouldn't travel on a corrugated road in a fully loaded vehicle at 80km/h.
At a much slower speed (40-60km/h) depending on conditions, I might let my tyre pressures down to 25psi

AnswerID: 54145

Follow Up By: Voxson (Adelaide) - Wednesday, Apr 14, 2004 at 10:44

Wednesday, Apr 14, 2004 at 10:44

I could not have said it better.....

FollowupID: 315802

Follow Up By: Cruisin - Wednesday, Apr 14, 2004 at 12:01

Wednesday, Apr 14, 2004 at 12:01

Let me rephrase.

I did not mean that I travel at this speed over corrugations even though thats how it read.
Corrugations dont last forever. Do you stop and inflate the tyres everytime the corrugations stop, I dont think so! When they do stop you can therefore safely speed up to 80km/h...which is more than fast enough on a dirt road. Therefore the tyre pressures need to be at a level where they can handle 80km/h without going above the 4 degree's celcius from cold tyre pressures. What is this level ????
I run 36psi in BFG Goodrich Muddies normally.
The question I am asking is what PSI would be a good all round pressure to run when on fairly main dirt roads that do have corrugations at times but at other times can be in good condition and up to 80km/h. I dont want to have to adjust tyre pressures 5 times a day, and i'm sure you dont either.
I am thinking about 28psi would be a safe compromise.

FollowupID: 315812

Follow Up By: Mister Jelly Bean - Wednesday, Apr 14, 2004 at 15:43

Wednesday, Apr 14, 2004 at 15:43

Cruisin, In light of your follow up, what you are saying is correct and the 28psi would be OK. If the road is more corrugations than reasonable (and how do you know whats ahead) the 25psi might be the way to go.

FollowupID: 315849

Reply By: Member - Raymond - Wednesday, Apr 14, 2004 at 11:30

Wednesday, Apr 14, 2004 at 11:30

Interesting note at the Derby information centre re unmade roads speed and tire pressures
Written by one of the locals after complaints of the number of punctures on the Gibb River Road.
Maximum speed on gravel roads 80KHP with tire pressures lowered by 15-20% from normal road pressure (this depended on load)
Much reduced speed on rough roads and corrugated roads.
Ray
PS Suggest that the change the 100kph on the GRR to 80 would probably save quite a few rollovers from the O/S travellers who see 100 and think that is the seep they have to travel at

AnswerID: 54155

Reply By: Moose - Wednesday, Apr 14, 2004 at 13:14

Wednesday, Apr 14, 2004 at 13:14

You are asking a question to which there is no definitive answer. Depends on so many factors. There is certainly no need to constantly adjust pressures. Once on dirt the one pressure should suffice irrespective of whether you're on corrugations or not. You will need to air up again once you get back on the black top for any significant distance. Your best bet is to air down to 28 as you suggest and see how it handles and how much the tyre temperature change is after travelling for a while. If the tyres are getting too hot then add some air.

AnswerID: 54169

Follow Up By: Cruisin - Wednesday, Apr 14, 2004 at 13:16

Wednesday, Apr 14, 2004 at 13:16

Yep

Agreed Moose

Cheers

FollowupID: 315825

Reply By: Pesty - Wednesday, Apr 14, 2004 at 19:01

Wednesday, Apr 14, 2004 at 19:01

Cruisin
Just did about 2000ks on gravel and ran 28 rear and 26 front fully laden and sat on the ton on good gravel without any probs and have done so many times without any probs. Common sense is the most important thing and drive to the conditions.

Cheers Steve

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Reply By: Eric from Cape York Connections - Wednesday, Apr 14, 2004 at 19:43

Wednesday, Apr 14, 2004 at 19:43

Cruisin on my truck I run wranglers mtr 32*11.5* 15 and with a fair load run the front at 19 and the rear at 24 but thats me.
I sugest to people who do a trip with us depending on tyre and load start at about 25 front and 30 rear and see how that works and these are cold pressures.
Some of the guests will let them down further and thats fine.

hope this helps.

Eric

www.capeyorkconnections.com.au

AnswerID: 54236

Reply By: Poppy - Wednesday, Apr 14, 2004 at 20:01

Wednesday, Apr 14, 2004 at 20:01

Hi Cruisin
I travel to Weipa every year running B.F.Goodrich All Terrain and run front on 25 and rear on 28 and "touch wood" no probs yet I just slow down on the black stuff, although every year there seems to be more of that bloody black stuff spoiling the adventure.
Regards Poppy

AnswerID: 54241