tyre pressure

Submitted: Tuesday, Apr 07, 2009 at 13:45
ThreadID: 67639 Views:2205 Replies:5 FollowUps:5
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Hello veiwers anyone got an estimate on what sort of tyre pressure you should run in your tyres on rough corrigated gravel ive been running 35 psi and wondering if that is to low since the normal tyre pressure is 60 psi any info welcomed thanks alot and enjoy your travells during easter.
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Reply By: Member - Wim (Qld) - Tuesday, Apr 07, 2009 at 13:50

Tuesday, Apr 07, 2009 at 13:50
Hi andoman.

Could I ask what tires and vehicle?

Both pressures seem a little high.

Regards

Wim
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July 2012 - Hay River & Binns track
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AnswerID: 358582

Follow Up By: andoman - Tuesday, Apr 07, 2009 at 14:28

Tuesday, Apr 07, 2009 at 14:28
They are all terrians and they are on a f-250 dual cab.
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Follow Up By: Member - Roachie (SA) - Tuesday, Apr 07, 2009 at 14:55

Tuesday, Apr 07, 2009 at 14:55
Depends on a lot of factors....main ones being weight of the rig, type and size of tyre ("all terrains" is a pretty broad description....are they LT's etc).

There is no precise science to working out tyre pressures.

I work on the rule that the rougher the surface, the lower the pressure AND the lower the speed!!! This last point is extremely important as, once you start lowering the pressures to avoid dramas on the rough stuff, you will overheat the tyres and blow a sidewall out if you don't slow down.

On a track such as the Oodnadatta Track, I'd probably drop down to 23psi and not go above about 75k/h..... but it all depends on how long since it'd be graded and what the corrogations were like etc.

60 psi going down to 35psi, seems waayyyy too high on both counts as far as I'm concerned, but it depends on weight, tyre size etc etc.
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Follow Up By: Blaze (Berri) - Wednesday, Apr 08, 2009 at 01:30

Wednesday, Apr 08, 2009 at 01:30
It will feel like a Rolls on concrete when the tyres are lowered, even with the wieght of a 250 I agree 23 to 28 offroad and maybe 40 onroad.

To many people read the vehicle spec plate and even with vehicle at 50% carrying capacity and different tyres they stick to these readings. IMHO most of the problem actually comes from the tyre fitters who have never been off the black top so have no idea.
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Reply By: Member - Troll 81 (QLD) - Tuesday, Apr 07, 2009 at 13:57

Tuesday, Apr 07, 2009 at 13:57
I run 42 on the road and around 25 on dirt/gravel sometimes lower depending on the conditions.
AnswerID: 358584

Follow Up By: PradOz - Tuesday, Apr 07, 2009 at 14:21

Tuesday, Apr 07, 2009 at 14:21
x 2
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Follow Up By: MEMBER - Darian (SA) - Tuesday, Apr 07, 2009 at 17:11

Tuesday, Apr 07, 2009 at 17:11
Ditto as well - and as Roachie says above, slow down with those lower pressures.... keeps the bulging tyres that bit cooler (or less hot) and you might go for weeks or more (or forever) without a flat ! It's worth the time.
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Reply By: Member -Dodger - Tuesday, Apr 07, 2009 at 14:33

Tuesday, Apr 07, 2009 at 14:33
Use the old 6psi Rule and you can then work it out yourself.

Tyre Pressures NRMA

Tyre pressures - do-it-yourself check
It is impossible to list the correct pressures for every vehicle, due to variation in size, load, etc. This easy check will help you find the best pressure for your vehicle tyres.
First inflate the tyres to the pressure recommended by the manufacturer of the trailer or the tyre you are using. Secondly, Drive your vehicle for a distance of 100 km, preferably on a highway.
Recheck the tyre pressures immediately after pulling over and compare them with the pressures you had at the start of your run. If the pressures are right, the hot readings should be 4 psi (28 kPa) higher than the cold readings.
If there is a greater than 4psi (28 kPa) difference between these pressures, the tyre temperature is too high and the pressure needs to be increased. If there is less than 4 psi (28 kPa) difference, the pressure needs to be lowered.
Large 4WD tyres will have a differential of 6 psi (42 kPa).
Be sure to use the same accurate gauge for both readings.
I used to have a handle on life, but it broke.

Cheers Dodg.

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AnswerID: 358589

Reply By: Warstar - Tuesday, Apr 07, 2009 at 15:31

Tuesday, Apr 07, 2009 at 15:31
On Bitumen I run the LC100 17" tyres at 50psi. and the van 14" at 50 as well. They only ever get warm to touch, and it seems to help in mileage. I always check and watch the wear pattern, if the tyre is wearing evenly across the tread, I figure pressures are appropriate.

Am I delusional?
AnswerID: 358600

Reply By: Crackles - Tuesday, Apr 07, 2009 at 20:46

Tuesday, Apr 07, 2009 at 20:46
Ando an F250 would need to run higher pressures than many with lighter 4 wheel drives are recommending. Fully loaded on outback roads 35 would be close to the mark depending on the type of tyre. On the Tar we normally run 55 psi on our work F trucks (MTR's) & anything less than 35 makes the handling pretty loose.
Cheers Craig............
AnswerID: 358672

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