Tyre pressure

Submitted: Saturday, Jan 01, 2005 at 17:06
ThreadID: 18992 Views:2057 Replies:9 FollowUps:6
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I am still a little confused, which pressure I should run my tyres on. I own a Nissan Patrol and have my tyres serviced every 10.000 kms. The tyre place reckons I need to run the front on 38 and the back on 34 on the bitumen. Yet the tyre placard says 29 front and 36 back.

Can anyone help?

Thank you
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Reply By: Banjo (SA) - Saturday, Jan 01, 2005 at 17:18

Saturday, Jan 01, 2005 at 17:18
You already know more about your tyres, than the "tyre place" Giggi ! (not uncommon - good advice can be hard to find). If you can post more detail on the vehicle and the tyres, plus the sort of surfaces you drive on, the feedback here will be worthwhile.
AnswerID: 90945

Follow Up By: Giggi - Saturday, Jan 01, 2005 at 17:31

Saturday, Jan 01, 2005 at 17:31
thanks mate,

Well i am pretty new at this forum stuff. So please be patient.

Anyway, I do most my driving on Bitumen road and the car itself is stock standard, except it got a Nissan Bullbar at the front. The tyres fitted are the ones which come with the car. Brigdestone AT's.
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FollowupID: 349516

Reply By: Giggi - Saturday, Jan 01, 2005 at 17:23

Saturday, Jan 01, 2005 at 17:23
Thanks Banjo,

My car is pretty stock standard. Has got a Nissan Bullbar up front and the standard Brigstone AT tyres. Most of the time I spend on the Bitumen Highways, sometimes I go to the Flinders Ranges. I do let the tyres down on the dirt roads, forgot once and eh presto had a flat. Incidentely this was the very first flat I ever had and I did own a few 4wds before (mainly utes).
AnswerID: 90946

Follow Up By: Squizzy - Saturday, Jan 01, 2005 at 19:52

Saturday, Jan 01, 2005 at 19:52
Giggi,

Run the car for a half hour, then feel the tyres.
If they are cold you have too much pressure, if they are hot you don't have enough pressure.
If they are warm, it is just right.
You need different pressures for each application of driving condition, so the above rule usually works okay.

Hope this helps,

Geoff.
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FollowupID: 349534

Reply By: Nudenut - Saturday, Jan 01, 2005 at 17:26

Saturday, Jan 01, 2005 at 17:26
I would most likely go with tyre placard on car and increase when needed or carrying extra weight for any length of time...
but 29 at front sounds a little low ...but try and then watch for excessive wear on outsides...if none leave....
AnswerID: 90947

Reply By: Willem - Saturday, Jan 01, 2005 at 17:41

Saturday, Jan 01, 2005 at 17:41
Rule of thumb these days seems to be around 32-34psi all round on bitumen and good gravel roads. I run these pressures in both the Kellys and my Cooper STT's, all 265/75/16's. On extreme dirt such as gibber I run 25-28 all round and and in very soft sand I run them at 15...have not had an issue so far after having switched from skinnys 6 months and 20,000k ago. I think my vehiocle is pretty well balanced weight wise. Carry 170lts fuel over the back axle and camping gear, and have bullbar, dual batteries and winch up front.
AnswerID: 90948

Reply By: 28patrol - Saturday, Jan 01, 2005 at 20:58

Saturday, Jan 01, 2005 at 20:58
I normally run 32 - 36, up them to 34-38 with a full load then apply the 4psi rule. works for me
AnswerID: 90964

Follow Up By: Glenn D - Monday, Jan 03, 2005 at 00:01

Monday, Jan 03, 2005 at 00:01
Hows it going

Also set my vehcle up running 38psi all round. I just went around Oz and adjusted my pressures as required ( 4 psi increase in the rear ) to adjust for the weight . For every dirt road dropped pressure by 4psi all round , more if the going got tougher. Didn't get a flat , but then again wasn't going hard ( I am not that old either). Running 285/75r16 bf goodrich allterrains , were new when I started. also have Patrol 3.0

Most of the guy's with flat tyres were trying to get too much out of road tyres

Cheeres Glenn
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FollowupID: 349625

Reply By: Banjo (SA) - Sunday, Jan 02, 2005 at 09:45

Sunday, Jan 02, 2005 at 09:45
As you can see, most people start with the placard and take it from there - don't think anyone suggested the bizarre idea of higher at the front ! The last time I went to Bob Jane's tyre place to look at some budget mags for another the car, the first sentence offered as advice to me was completely wrong - we are being driven to the stage where we will have to know everything ourselves !
The much travelled Willem's advice is to be noted - I expect he keeps a very good eye out for those "problem" stones AND drives conservativley as a rule !
AnswerID: 90985

Reply By: glenno(bris) - Sunday, Jan 02, 2005 at 11:32

Sunday, Jan 02, 2005 at 11:32
I was told by bloke at tyre place (32psi on road) and (minimum of 22psi on sand).
AnswerID: 90997

Follow Up By: Voxson (Adelaide) - Tuesday, Jan 04, 2005 at 09:48

Tuesday, Jan 04, 2005 at 09:48
I believe that pressure to be too low for bitumen and too high for sand...

Not only are pressures dependant for load carrying they are also dependant on speed.....

As said before in this post,,, temperature plays a big part also...

If you have a high speed 4x4 (110 - 140kmh) then extra pressure is better to keep the temp down and to help the centrifugal force from throwing the centre to the ground first causing wear in the centre which people often mistake for too much pressure....

Lower speed 4x4 (80 - 100kmh),, then less pressure is ok....
It is hard to put a number on it because all 4x4's are different, weight, speed, tyre size, etc....

And 22psi for sand would be an absolute staring point.... The longer and fatter the contact patch the better the traction... Very simple...
I have easily driven on 14psi in sand,, just dont be silly on the corners and the brakes....
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FollowupID: 349782

Reply By: Knight Patrol - Tuesday, Jan 04, 2005 at 16:02

Tuesday, Jan 04, 2005 at 16:02
Tyre pressure is the one aspect of using a $wd that can make or break the moment. I run my Patrol 3L with 38psi all round on the road and the wear is pretty even across the tread (100-110kph). The upside is good fuel economy, road adhesion with the downside of a bit more road noise and slightly "lumpier" ride. Gravel road I drop them back to 32psi and usually slow down to 80-90kph tops. On the SOFT stuff I go as low as 12psi and watch the steering and braking (40-50kph tops). In all cases keep the pressures even as minor disparities between tyres can affect handling on unmade surfaces especially.

A valve air bleeder, good compressor and pressure guage makes the adjustment quick and easy and the tyre can get on with doing what they need to do in that specific situation.
AnswerID: 91291

Reply By: Member - Jeff M (WA) - Tuesday, Jan 04, 2005 at 20:16

Tuesday, Jan 04, 2005 at 20:16
I was fully loaded during the week, running bridgstone Desert Dullers and found that 30psi was very wonky, I was running 45psi all round at it was good, stopped and let some out for a corrigated road, no probs, back on the bitumen and after 60-70k's I stopped and pumped them up, felt like I was driving the HMAS Surf!

My pressures:
42psi round town, 45-48 loaded and 25-30 for gravel if rough, 10-18 for sand depending on load and condtitions.

Everyone is different, everyone's vehicles are loaded differently, run different rubber and have different driving styles, the above suits me, some people think I run a little on the extremes. My Bridgstones are looking pretty weathered but they've still got good tread have been absolutally hammered off road and have not had a puncture/flat (where's that wood!) since I've had it (which is only 14 months, but she's done a lot in that time).

AnswerID: 91322

Follow Up By: Muddy 'doe (SA) - Tuesday, Jan 04, 2005 at 20:21

Tuesday, Jan 04, 2005 at 20:21
Hey Jeff,

I can see why your tyres last a good while. Judging by your rig pic you only use 3 at a time! Is this a regular trick?

Cheers
Muddy
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FollowupID: 349875

Follow Up By: Member - Jeff M (WA) - Tuesday, Jan 04, 2005 at 20:25

Tuesday, Jan 04, 2005 at 20:25
Ummm, Correction.... I was only using two in that photo... (it's a little hard to see).

But yeah I find that way I always have an extra spare! LOL :-)
I don't think my blood pressure was too good after that one, so no it's not that regular! But somthing else was pretty regular for the rest of the day! :-P

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FollowupID: 349877

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