tyre pressures

Submitted: Tuesday, Jan 06, 2009 at 17:10
ThreadID: 64854 Views:2318 Replies:9 FollowUps:4
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hi peoples,

now im not a beginner in 4wding but im also not a know it all. so i pose a question to all...well more of a survey.
i have Mickey Thompson ATZ (5 lug) LT 265/75/16
i am trying to find MY ideal tyre pressures for the GU, and have found the ride harsh over 35psi on road.

this is what i have found to be comfortable for me.

33-35psi on road

25-30psi on fast gravel road, depending on how smooth it is.

20-25psi for low range off road (havent tried lower yet, maybe next weekend).

so if you want to play this game, i am interested in hearing your ideal pressures

PS. i couldn't find anything like this on previous posts.
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Reply By: Member - Troll 81 (QLD) - Tuesday, Jan 06, 2009 at 17:18

Tuesday, Jan 06, 2009 at 17:18
Greg,

I have the MTZ's 285/75R16 and I run 40 on the black stuff and find it great but I do have Koni's replaced the ranchos and it made a huge difference. On dirt I drop down to about 30 and around 22 for the beach
AnswerID: 342886

Reply By: Member - Tony B (QLD) - Tuesday, Jan 06, 2009 at 19:51

Tuesday, Jan 06, 2009 at 19:51
I run 36 all round in My Cooper Sts on the hard stuff & Gravel. 24-26 in the rough & rocks and 18psi in the sand. Cheers Tony
AnswerID: 342913

Reply By: Patrolman Pat - Tuesday, Jan 06, 2009 at 19:54

Tuesday, Jan 06, 2009 at 19:54
I have the same tyres Greg but in 285 75 16 size. I sun mine at 36+ on road and don't find it too harsh, it's certainly a firm ride but I prefer that anyway.

Gravel I'm usually around 24-26 psi, anywhere that requires low range I'm usually around 18 psi and as low as 10-12 psi on real soft sand.

The tyres have done nearly 30000kms and are wearing really well
AnswerID: 342914

Follow Up By: Member - Greg T (ACT) - Tuesday, Jan 06, 2009 at 20:45

Tuesday, Jan 06, 2009 at 20:45
i use to run 40-45 on road, but after putting the 2 inch EFS lift kit in, it is like hitting low range stuff at 50km/hr. i am hoping that after i put steel bull bar on and winch, that should soften it up a bit (from the extra weight). 10-12psi!!, i dont think im that daring to go down that far, but i will go to 18psi next week when im at bendethra.
cheers,
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FollowupID: 610649

Follow Up By: Trevor R (QLD) - Tuesday, Jan 06, 2009 at 21:48

Tuesday, Jan 06, 2009 at 21:48
I ran 10psi on the front and 14 on the rear crossing Big Red on the edge of the Simpson and what a difference it made. 20psi was too high at the time. Vehicle pretty loaded but make sure you take it easy at these pressures with no sharp turns at speed. I will add I was the only one in our group to make the middle "hardest/steepest" crossing of Big Red and I put it down to tyre pressures.

Cheers, Trevor.
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FollowupID: 610674

Reply By: Member - Warfer (VIC) - Tuesday, Jan 06, 2009 at 22:38

Tuesday, Jan 06, 2009 at 22:38
I believe your on the right track Greg,I find if i put mine on 20 PSI on gravel and drive around they feel too flat (going up/down,low range steep hills fine)..25 PSI seems to be spot on for me off road...


cheers
AnswerID: 342966

Reply By: Off-track - Tuesday, Jan 06, 2009 at 23:17

Tuesday, Jan 06, 2009 at 23:17
40 tar, 40 gravel.
AnswerID: 342972

Follow Up By: Member - Bevan (QLD) - Wednesday, Jan 07, 2009 at 01:46

Wednesday, Jan 07, 2009 at 01:46
same here 40 tar 40 gravel, if you driving down a gravel road and you need to drop you tyre pressure your driving on it wrong. i have not dropped pressure on sand, mud, or snow and only ever get stuck when i run out of clearance. to much effort dropping pressure and pumping it back up again. i run kumo M/T 31".
mind you i have not crossed the simposon or driven to the cape. just local stuff. granted you would have to let you tryes down doing those kinds of trips.
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FollowupID: 610706

Follow Up By: Off-track - Wednesday, Jan 07, 2009 at 23:21

Wednesday, Jan 07, 2009 at 23:21
Yep no punctures here (touchwood). Cape was done with 40 no probs but when we get around to doing the Simpson the pressure will come down.
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FollowupID: 610944

Reply By: offroad Bob - Wednesday, Jan 07, 2009 at 02:13

Wednesday, Jan 07, 2009 at 02:13
40 tar and 40 gravel. Just go slower on gravel. I will often go to 10psi on beach sand in WA when it is really soft. Once while towing other stuck vehicles at Ningaloo I spun a tyre off a rim from low pressure. On another occasion I have damaged tyres by bouncing the rim on the tyre from low pressure going up steep sandy dug over tracks. These are unfortunate occasions but when you get stuck there becomes fewer options.

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AnswerID: 342979

Reply By: Welldone WA - Wednesday, Jan 07, 2009 at 02:44

Wednesday, Jan 07, 2009 at 02:44
Blacktop and gravel 50-40psi depending on load .
Sand 18 - 22psi for "normal" sand and don't exceed 40kph .
Climbing really soft sand with tubeless tyres 10-3psi and re-inflate to at least 18psi as soon as you are out of the rough stuff. Split rims shouldn't be deflated below 12psi as the walls overflex and become weakened.

AnswerID: 342983

Reply By: Member - Phil G (SA) - Wednesday, Jan 07, 2009 at 13:21

Wednesday, Jan 07, 2009 at 13:21
Until recently, I ran the same size tyres as you.

42/50psi on road

28-32psi on fast gravel road, depending on how smooth it is.

below 20psi for low range off road
AnswerID: 343051

Reply By: Member - Robert G (WA) - Wednesday, Jan 07, 2009 at 19:21

Wednesday, Jan 07, 2009 at 19:21
305x70x16 M/T ATZ 4 rib on a HDJ100 Cruiser wagon reasonably heavily loaded.

blacktop - 36-38psi front, 40-44psi rear (used TPMS and old 4psi rule to get these pressures for my vehicle)

Gravel - 25-28psi front, 28-30psi rear

Sand (hard) 20-22 psi all round
Sand (soft) 16psi
Sand (very soft) 10-12psi

I don't need to adjust pressures on hard sand or gravel but do so to look after my tyres and the tracks. Speed is pretty important factor too.
AnswerID: 343111

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