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tyre pressure
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Author:  treeherder [ Fri Aug 21, 2009 2:38 am ]
Post subject:  tyre pressure
hey all,
Any suggestions on tyre pressure for day-to-day driving vs pressures for offroading on a set of 30x9.5 bfg mud-terrains>?
Car is a 91 LWb vitara.

Cheers!!

Josh
Author:  shep [ Fri Aug 21, 2009 2:43 am ]
Post subject:  Re: tyre pressure
i run around 18 to 20 psi on the road and that is probably to much.
Author:  shep [ Fri Aug 21, 2009 2:44 am ]
Post subject:  Re: tyre pressure
opps didn't realise it is a vit. just do what the tyre placard says.
Author:  Fluffy [ Fri Aug 21, 2009 2:49 am ]
Post subject:  Re: tyre pressure
hey treeherder. welcome aboard
Author:  Scrawny [ Fri Aug 21, 2009 9:18 pm ]
Post subject:  Re: tyre pressure
Start with 20 onroad and 10 off. If that is too soft/hard then just adjust from there. I wouldn't go much less than 10 off road as you tend to pop beads too easily.
Author:  steve [ Fri Aug 21, 2009 10:00 pm ]
Post subject:  Re: tyre pressure
Like shep, i run 20psi in my Sierra, on and offroad.
Author:  ajsr [ Sat Aug 22, 2009 12:07 am ]
Post subject:  Re: tyre pressure
15 on road
3-4 off road
Author:  zukenutter [ Sat Aug 22, 2009 12:55 am ]
Post subject:  Re: tyre pressure
When I mount new tyres that are not standard size I make a chalk mark from one side of tread to the other and run back and forth a couple of times on a flat surface. If chalk is left in the middle of the tread it needs more air and if chalk is left on the outside lower the pressure.

Try this with stock tyres and compare the results with the factory pressure placard. I found this method quite accurate. For on road obviously. As for off road depends on conditions etc and personal preference.
Author:  Makie43 [ Sun Aug 23, 2009 9:54 am ]
Post subject:  Re: tyre pressure
After reading this post I thought I might check my tyre pressures, as I just had new ones fitted! I must point out that I am new to Zooks and 4wd in general so I thought rough was the norm... The driver's side rear had 41lbs the passenger side rear 37lbs front drivers side 35lbs and the passenger side front 32lbs. So I dropped them all to 20lbs!!! At least the CD doesn't try to jump into the cab with me now! These were fitted at a well known tyre company with most of the guys driving off road vehicles?????Guess I got the apprentice that day, my own dumb fault for not checking them myself!
Author:  twitchy [ Sun Aug 23, 2009 11:29 am ]
Post subject:  Re: tyre pressure
Don't be afraid to name & shame shoddy work mate. That is piss poor from a tyre company.

Back what you run, about 20 is a good all round pressure, old mans LJ fiddy runs 13Lb on & off road.
Author:  Gwagensteve [ Sun Aug 23, 2009 12:20 pm ]
Post subject:  Re: tyre pressure
Makie43 wrote:
After reading this post I thought I might check my tyre pressures, as I just had new ones fitted! I must point out that I am new to Zooks and 4wd in general so I thought rough was the norm... The driver's side rear had 41lbs the passenger side rear 37lbs front drivers side 35lbs and the passenger side front 32lbs. So I dropped them all to 20lbs!!! At least the CD doesn't try to jump into the cab with me now! These were fitted at a well known tyre company with most of the guys driving off road vehicles?????Guess I got the apprentice that day, my own dumb fault for not checking them myself!


This is normal from my experience.

Tyre shops seem to leave tyres at whatever the bead seated at. Always worth a check yourself to be sure.

Steve.
Author:  Rockhopper [ Sun Aug 23, 2009 12:48 pm ]
Post subject:  Re: tyre pressure
Makie43 wrote:
After reading this post I thought I might check my tyre pressures, as I just had new ones fitted! I must point out that I am new to Zooks and 4wd in general so I thought rough was the norm... The driver's side rear had 41lbs the passenger side rear 37lbs front drivers side 35lbs and the passenger side front 32lbs. So I dropped them all to 20lbs!!! At least the CD doesn't try to jump into the cab with me now! These were fitted at a well known tyre company with most of the guys driving off road vehicles?????Guess I got the apprentice that day, my own dumb fault for not checking them myself!


As Gwagonsteve said this is normal. I got my wheels and tyres from a very reputable 4x4 specialist in Smithfield, and although they did'nt actually fit them to my car I specified they were for my Suzuki Sierra. After I fitted them and went for my first test drive which almost knocked the fillings out my teeth, I checked the tyre pressures and dropped them down from 40 psi to 22 psi. Drives nice now :)
Author:  steak_knife [ Sun Aug 23, 2009 12:59 pm ]
Post subject:  Re: tyre pressure
Its drummed into tyre boys that 4wd`s Need to run min of 35psi, apparently the larger the tyre ( regardless of vech size ) the higher the pressure.
Believe it or not, but these boy have to be trained to to their jobs, or are ment to be anyway .
Author:  twitchy [ Sun Aug 23, 2009 3:09 pm ]
Post subject:  Re: tyre pressure
As a tyre fitter you bugger all training except what the person before you was taught.................................

Not once were we allowed to let cars go out at uneven pressures & if the client specified a pressure then they got it... Beaurepaires & bob Jane.
Author:  zukenutter [ Mon Aug 24, 2009 12:05 pm ]
Post subject:  Re: tyre pressure
Makie43 wrote:
After reading this post I thought I might check my tyre pressures, as I just had new ones fitted! I must point out that I am new to Zooks and 4wd in general so I thought rough was the norm... The driver's side rear had 41lbs the passenger side rear 37lbs front drivers side 35lbs and the passenger side front 32lbs. So I dropped them all to 20lbs!!! At least the CD doesn't try to jump into the cab with me now! These were fitted at a well known tyre company with most of the guys driving off road vehicles?????Guess I got the apprentice that day, my own dumb fault for not checking them myself!


I've also always had the same experience.

Also with each new car that I've owned, when I get it back from a warranty service the tyres are always over-inflated. It's just as dangerous as under-inflation, particularly in the wet. Much easy to aquaplane, or step-out while cornering.
Author:  brendan [ Mon Aug 24, 2009 5:38 pm ]
Post subject:  Re: tyre pressure
got my tires back from a well know tire place. 60PSI!!!!!!!!!! now i run 25psi
Author:  S13RR4 [ Wed Sep 09, 2009 6:21 pm ]
Post subject:  Re: tyre pressure
has anyone got an idea as to what pressure i should run my stock radius tyres??? i know your all saying 20psi but are they stock tyres or 30's and bigger.
i used to work for a tyre place fitting wheels and wheel related shite, and i was taught to put about 32psi in a smaller car like a sierra (small compared to cruisers and pootrols, not in sprirt) for on road purposes
it all depends on the type of driving you do and the loads you carry i know but i was just curious to what other sierra owners recon i should be running

i think i might have to try the chalk idea zooknutter sugested
Author:  Scrawny [ Wed Sep 09, 2009 6:27 pm ]
Post subject:  Re: tyre pressure
I tried 20psi in my stockers (205/75's) and they squealed on cornering, bumped them up to 25 and all good.

I run 20 in my 31's, but they all leak so they're probably at about 10 now :roll:
Author:  zukenutter [ Wed Sep 09, 2009 6:30 pm ]
Post subject:  Re: tyre pressure
ScrawnC wrote:
I run 20 in my 31's, but they all leak so they're probably at about 10 now :roll:


I hate it when they leak. I got mud in between the rim and tyre last outing. Have had them all off the rim and cleaned, but 2 are still leaking. :cry:
Author:  RIKSTR [ Wed Sep 09, 2009 7:29 pm ]
Post subject:  Re: tyre pressure
treeherder wrote:
hey all,
Any suggestions on tyre pressure for day-to-day driving vs pressures for offroading on a set of 30x9.5 bfg mud-terrains>?
Car is a 91 LWb vitara.

Cheers!!

Josh


I have 31"s on my LWB Vit and I run 30psi on the road and 12psi offroad.

I reckon the best way to get a road pressure is to put in about 35psi and roll the car with wet tyres on some dry concrete or road. You will see if the pressure is to high, because you wont get the full pattern of the tyre in the imprint. Just keep letting air out until you get a full tread pattern contacting the road.
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