tire pressures

Submitted: Friday, May 12, 2017 at 19:28
ThreadID: 134853 Views:3935 Replies:4 FollowUps:4
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have a px twin cab ranger with a slide on,fully loaded about 3100kg just 100 kg under gvm ,tyre pressures by book 38 and44 psi, mickey thompson atz p3 tyres,need advice on what pressures for sand or corrugations thanks for future answers barry
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Reply By: Frank P (NSW) - Friday, May 12, 2017 at 19:53

Friday, May 12, 2017 at 19:53
I have a BT50 with the same loads and run about the same pressures in BFG All terrains, perhaps a touch higher.

For corrugations I'd run 10 to 15PSI less all round, depending on severity. Reduced speeds, of course.

I don't do sand, but if I did, considering what I've read from others who do, at those weights I'd be looking at 18 front, 20 rear and monitor, see how you go.


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Follow Up By: Dean K3 - Friday, May 12, 2017 at 21:07

Friday, May 12, 2017 at 21:07
Are those pressures vehicle manufacturer recommended tyre pressures or from tyre manufacturer.

I run 40psi all round on a prado and would never have that kind of weight period, for bitumen road suspect they maybe too low. Know a person with triton with camper unit on back who runs closer to 50-60psi all round to compensate for higher loads involved

HOWEVER I use a 10psi rule i drop 10psi depending on type of terrain I am driving on and reduce speed accordingly so gravel down to 30 very corrugated gravel 25 is nice then 20 for sand and if its deep soft sand down to 10psi for get me outta manure situation.

the 10psi is very slow and steering is best kept straight with no sudden turns
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Follow Up By: Frank P (NSW) - Saturday, May 13, 2017 at 12:03

Saturday, May 13, 2017 at 12:03
The starting point was from the tyre manufacturer, given the weight on each axle.

My intermediate pressures are softer than theirs, based on experience.
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Follow Up By: HKB Electronics - Saturday, May 13, 2017 at 20:22

Saturday, May 13, 2017 at 20:22
Interesting regarding the Prado, handbook for my states 31PSI all round for factory tires. I run 35PSI for the ST Max Prado fully loaded with camper on the back. Start dropping pressures as soon as I hit the dirt.

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Follow Up By: george50 - Sunday, May 14, 2017 at 18:22

Sunday, May 14, 2017 at 18:22
I agree with above follows , but my slide-on is on a hilux traytop on BFG 245x16s and maxxed on GVM . I tried to get the ideal dirt/gravel recommended psi of 28 psi but it's blowing out the walls too much so 32psi for me .
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Reply By: IvanTheTerrible - Sunday, May 14, 2017 at 19:36

Sunday, May 14, 2017 at 19:36
We run a Dmax about 150 below it's Gvm. We run 40 onroad, 25 to 28 on dirt and only drop it in sand if we are having trouble. then we go to 15 but re inflate before we go anywhere on solid ground.
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Reply By: Member - Barry P (VIC) - Monday, May 15, 2017 at 19:30

Monday, May 15, 2017 at 19:30
the tyre pressures i gave were from the ford manual for dunlop at22 tyres ,and the local tyre shop who fitted the mickey thompsons, told me to run the same pressures for the atz p3 tyres thanks barry
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Reply By: The Bantam - Tuesday, May 16, 2017 at 21:37

Tuesday, May 16, 2017 at 21:37
it is important to understand that tyre pressures are consistent across all tyres of the same type and size ....... it's all about air volume. .... a tyre is a load bearing pressure vessel.

so if you run a 31x10.5R15 LT ....... regardless brand or tread pattern ...... the recommended minimum pressure for load carried will be the same. ..... this applies to all tyres as long as the tyre type is the same.

this is the first thing that must be understood

The maximum tyre pressure and thus the maximum load will be determined by the caracase strength ..... expressed as the ply rating

.


The other thing the absolutely must be understood is that appropriate tyre pressure varies with tyre size, carcase structure and load carried ........ someone with the very same vehicle, with exactly the same load will have different appropriate tyre pressures if the tyre size and or type is different.

There is an Australian standard tyre manual that has reliable load V pressure tables for most tyres ..... pretty much every tyre dealer should have one ........ you local library may have one.

as far as the so called "rules" ..... most of them are unreliable at best ......

the only reliable rule is ........ if you reduce your tyre pressure below the reccommended minimum load for pressure ...... you must reduce speed ...... by how much ....... that is up for debate.

cheers
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