Tyre pressure when carrying load???

Submitted: Monday, Jun 18, 2012 at 16:57
ThreadID: 96342 Views:3745 Replies:4 FollowUps:7
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G'day fellow travellers! :) Does anyone know the recommended tyre pressure I should be having when carrying a load? I have a Toyota Hilux LN106R currently packed with my valued belongings and camping gear and relocating from the east coast to the Pilbara... so a long journey ahead. The additional weight under the canopy is approx 450kg. My Tyres are a set of Bridgestone Duelers 31x10.50R15LT any tips on the pressure I should be running??? and should this remain the same on unsealed roads??? Thanks! :)

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Reply By: Member - Phil G (SA) - Monday, Jun 18, 2012 at 18:54

Monday, Jun 18, 2012 at 18:54
I used to run same tyres in that size on a 60series. Punctured 3 tyres in a day once from running pressures that were too high.

The Bridgestones in that size are a fairly light duty tyre - despite being LT.
They are the same as the old 6-ply tyre. You will find the max pressure written on the sidewall to be around 50psi which is fairly low for a 4wd tyre.

My suggestion is to run say 28psi front and 35psi rear on the bitumen and see how it goes. On gravel, reduce the pressures to say 24 front and 28 rear to reduce the likelihood of tread punctures.

Tyres pressures vary with your load and setup - you need to experiment as you go.
AnswerID: 488837

Reply By: rainbowprof - Monday, Jun 18, 2012 at 20:01

Monday, Jun 18, 2012 at 20:01
Is there a tyre placard near the door seal or in the glove box to give you some leads? I often run just under the recommended pressure as listed on the tyre itself, and each tyre and brand varies. The claims by the manufacturer usually state that the maximum pressure listed on the tyre is for the highest load rating. Some of my 14 ply rated tyres list 80 lbs as thier max pressure and I have run close to that (fully loaded: 6 people and trailer on bitumen and long corrugated roads) with confidence and nary a problem. I know the opinions and experience of others may differ significantly, but I quote from the reality of my own tried and tested driving on-road obsevations. And I usually carry two full spares for the unexpected. Tyre prices are usually highest in those places where you really need them!! I find firm pressure helps vehicle handling and fuel economy. Safe travels.
AnswerID: 488845

Follow Up By: Member - Phil G (SA) - Monday, Jun 18, 2012 at 20:44

Monday, Jun 18, 2012 at 20:44
His tyre placard will say 205R16 on split rim which is a very different tyre to the 31x10.5R16 tyre on a tubeless rim that he's running and many Hilux owners upgrade to.

But I'm impressed!! Anyone who can run 14 ply tyres at 80psi on a leaf sprung troopie on corrugated roads deserves our respect!!
FollowupID: 763985

Follow Up By: rainbowprof - Monday, Jun 18, 2012 at 21:02

Monday, Jun 18, 2012 at 21:02
ha,ha. Do I detect some dry humor there, Phil? I believe the OME suspension upgrade has been incredibly effective (maybe the greasable shackles and lubricating the leaves helps) as the driving is smooth and comfortable- and I've been in other peoples Troopies that were like a a combination of jackhammers and rocks, and they ran much lower pressures and different tyres. And maybe an extra leaf. To tell the truth, my wife said she thinks the suspension and ride (with standard seats) in our vehicle are comfortable and more than adequate, so I can only concur and agree. Wolfe Creek Meteorite Crater road was a bit bumpy, but I blame the road rather than the vehicle. If the truth be known, I'm moving on to an automatic 80 series GXL with 1HD-T (picked up yesterday) but will continue to run same split rims on it. Anyone looking for a 98 Troopie like the one in the picture? Superlative vehicle. Only upgrading to have more legal seats.
FollowupID: 763989

Follow Up By: Member - Phil G (SA) - Monday, Jun 18, 2012 at 21:18

Monday, Jun 18, 2012 at 21:18
Yep, should have put a smiley in there! But on most vehicles, the suspension would shake to pieces with those tyres at that pressure. You're just lucky you've got (had) a troopie! You'll enjoy the coil springs and the 1HD-T on the new vehicle. Go on...be a devil and fit some Bridgestone 286/75 on those nice factory rims :-)
FollowupID: 763991

Follow Up By: rainbowprof - Monday, Jun 18, 2012 at 21:31

Monday, Jun 18, 2012 at 21:31
yep, we expect that the change will suit our lifestyle and requirements. I'll test both tyre types to make an informed personal decision on the 'new' vehicle, Phil. It's come with the wider GXL rims and tyres. We are a bit over-extended as I'm waiting to find an interested person for the troopie. Ad to follow in the near future.
FollowupID: 763993

Follow Up By: Ross M - Monday, Jun 18, 2012 at 22:12

Monday, Jun 18, 2012 at 22:12
I agree that near 80 psi on 14 ply tyres is definitely firm.
FollowupID: 763999

Follow Up By: rainbowprof - Monday, Jun 18, 2012 at 22:19

Monday, Jun 18, 2012 at 22:19
The tyre manufacturer stated max 90 psi for maximum load rating. And I thought, well me and the kids aren't exactly overweight (read skinny, like the tyres). No comment on SWMBO who doesn't read this forum...
FollowupID: 764001

Reply By: splits - Monday, Jun 18, 2012 at 21:09

Monday, Jun 18, 2012 at 21:09

Try contacting Bridgestone's customer inquiry section.http://www.bridgestone.com.au/contact/ If they can't help you then nobody can. The last time I contacted the manufacturer of my tyres they even gave me the weight each 1 psi increase would support.
AnswerID: 488856

Follow Up By: rainbowprof - Monday, Jun 18, 2012 at 21:31

Monday, Jun 18, 2012 at 21:31
sound advice, splits
FollowupID: 763994

Reply By: Member - Bucky - Tuesday, Jun 19, 2012 at 03:38

Tuesday, Jun 19, 2012 at 03:38
Depends what roads you will be on.

On Canning trip I weighed 4.7 tonne loaded, including camper.
Most outback roads I run approx 26psi, and 22 in the camper, top speed 80 km/hr
In the Canning itself I run 12 front, 15, rear, and 12 camper, and kept mostly under 20 km/hr.

Bitumen roads I run 40 front, 44 rear, and 36 camper, and sit on the speed limit.
All pressures hot.
Hope this helps


AnswerID: 488875

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