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What size tyre and pressure do you run?
https://auszookers.com/forum/viewtopic.php?f=5&t=4062		 Page 1 of 2
Author:  want33s [ Thu Feb 12, 2009 1:18 pm ]
Post subject:  What size tyre and pressure do you run?
There's a bit of talk about tyre pressures in another thread so I thought I'd start this one so noobs can find the relevant info easily in a search.
State your tyre size and road/offroad pressures.

Mine: Sierra LWB
33x10.5-15 Silverstone MT-117 extreme on 15x7" rims
20psi all round ON road
4psi front.. 3psi rear OFF road. (Staun beadlocks)


EDIT: added rim size.
Author:  Scrawny [ Thu Feb 12, 2009 1:25 pm ]
Post subject:  Re: What size tyre and pressure do you run?
31's on 15x8 rims

- 18psi on road
- 8ish off road (if I went off road :roll: )
Author:  scottysj80 [ Thu Feb 12, 2009 1:41 pm ]
Post subject:  Re: What size tyre and pressure do you run?
mine: swb sierra
235x75 road tyers on 15x7 rims
20-22 psi on road
and down to 10psi off road
Author:  JrZook [ Thu Feb 12, 2009 2:31 pm ]
Post subject:  Re: What size tyre and pressure do you run?
235/75 BFG MT on 15x7's
10psi offroad
40 psi on road
Author:  Scrawny [ Thu Feb 12, 2009 2:44 pm ]
Post subject:  Re: What size tyre and pressure do you run?
JrZook wrote:
40 psi on road


8O 8O 8O How does it ride???
Author:  shep [ Thu Feb 12, 2009 2:54 pm ]
Post subject:  Re: What size tyre and pressure do you run?
31s on 15x8 20psi on road and 9 to start with off road.
my last tyres (32s) worked well at 4psi.
Author:  Cade [ Thu Feb 12, 2009 2:54 pm ]
Post subject:  Re: What size tyre and pressure do you run?
i have 235/75/15 with 36 psi
Author:  shep [ Thu Feb 12, 2009 2:57 pm ]
Post subject:  Re: What size tyre and pressure do you run?
Cade wrote:
i have 235/75/15 with 36 psi

the recommended pressure for the standard tyres is 22psi
bigger tyres need less air.
Author:  JrZook [ Thu Feb 12, 2009 4:30 pm ]
Post subject:  Re: What size tyre and pressure do you run?
ScrawnC wrote:
JrZook wrote:
40 psi on road


8O 8O 8O How does it ride???


Quite well for a sierra actually. OME light duty springs and oil filled adjustable shocks. So much nicer to steer and after 80000ks the tyres are wearing dead flat across the tread.

Dan
Author:  Cade [ Thu Feb 12, 2009 6:37 pm ]
Post subject:  Re: What size tyre and pressure do you run?
pretty sure my tires wall says 36psi max

Khumo A/T 235/75/15
Author:  royce [ Thu Feb 12, 2009 6:51 pm ]
Post subject:  Re: What size tyre and pressure do you run?
235/75R15 Wrangler ATR

22psi, 50000km and worn ok except for the inside edge from too much camber and the wobbles from dead struts :), could of done another 30k I reckon
Author:  Cade [ Thu Feb 12, 2009 6:56 pm ]
Post subject:  Re: What size tyre and pressure do you run?
hmmmm maybe i need to drop some psi

do you guys go by whats on the tire wall
Author:  shep [ Thu Feb 12, 2009 6:59 pm ]
Post subject:  Re: What size tyre and pressure do you run?
Cade wrote:
hmmmm maybe i need to drop some psi

do you guys go by whats on the tire wall


no
Author:  Cade [ Thu Feb 12, 2009 7:04 pm ]
Post subject:  Re: What size tyre and pressure do you run?
interesting i want go experiment now :)

but some advice guys

i leave on Monday for my road trip from Perth to Exmouth (3000km round trip)

what psi should i go

not sure if i want to experiment going on a big drive
Author:  Scrawny [ Thu Feb 12, 2009 7:09 pm ]
Post subject:  Re: What size tyre and pressure do you run?
Lots of highway miles requires a little more pressure. I would up the pressure to about 25psi for the big trip. Sierras are too light to have anything more than that in the tyres, I think the tyre placard on the car says 22psi?? 40psi is for Patrols and Landcruisers, not Sierras.
Author:  Cade [ Thu Feb 12, 2009 7:15 pm ]
Post subject:  Re: What size tyre and pressure do you run?
i was just going by whats on the tyre wall :( the inflation reccomendation
Author:  ZukChiK [ Thu Feb 12, 2009 7:59 pm ]
Post subject:  Re: What size tyre and pressure do you run?
Cade, if you have a full load on your long journey I would suggest around 30-32 PSI for highway speeds
Author:  felix [ Thu Feb 12, 2009 9:48 pm ]
Post subject:  Re: What size tyre and pressure do you run?
22 on road
start at 10 offroad.. unless im just having a play in some dirt then i cbf.

31x10.5 bfg muddies, on SWB vitara.
Author:  Cade [ Thu Feb 12, 2009 10:52 pm ]
Post subject:  Re: What size tyre and pressure do you run?
just checked my tyres

they are actually 225/70/15 max pressure 35psi

i just thought that was how much you are menat to inflate too

DOWN she goes :)

run on 32 for the trip to exmouth
Author:  ajsr [ Thu Feb 12, 2009 11:50 pm ]
Post subject:  Re: What size tyre and pressure do you run?
34" swampers ltb's 6-8 lbs off road 15 lbs on road(rairly on road)
Author:  joeblow [ Fri Feb 13, 2009 12:51 am ]
Post subject:  Re: What size tyre and pressure do you run?
JrZook wrote:
ScrawnC wrote:
JrZook wrote:
40 psi on road


8O 8O 8O How does it ride???


Quite well for a sierra actually. OME light duty springs and oil filled adjustable shocks. So much nicer to steer and after 80000ks the tyres are wearing dead flat across the tread.

Dan


people...its not the ride that is important...that is a secondary issue...the most important thing with pressures is braking performance, the higher the pressure, the poorer the braking performance!

as for me with 33's....
max 18 on road....
10 offroad.....(i'm 1.5 ton laoded!...)
Author:  twitchy [ Fri Feb 13, 2009 1:42 am ]
Post subject:  Re: What size tyre and pressure do you run?
Jesus h christ Joe, where the flying frog fuck did ya dig that bit of gold from????? The Higher the pressure the worse the braking?
Low air pressure will INCREASE bad handling & braking. Out of all the above mentioned pressures If I was on the the tar I'd rather be with Cade or Jnr if something hairy happened.
Author:  alex [ Fri Feb 13, 2009 1:47 am ]
Post subject:  Re: What size tyre and pressure do you run?
235/75R15 Wrangler MT/R on my swb sierra i run 25 on 15 off
Author:  royce [ Fri Feb 13, 2009 1:50 am ]
Post subject:  Re: What size tyre and pressure do you run?
higher pressure reduces the amount of rubber on the road, thats why you let your tyres down off road, more traction

less rubber on the road, less grip for braking, less grip for conering.
the only benefit for high pressures is increased sidewall stiffness which helps turn in, but thats easilly fixed with decent suspension settings

too low pressure also cause the sidewalls to flex too much and overheat, a good rule of thumb for fully loaded pressures is you want about a 2psi pressure increase once the tyres are hot, any more and the pressure is too low, or your too overloaded for the tyre (unlikely on a sierra or vitara)

the key here is not higher or lower, its correct, car companies pay engineers big $$$ to sort this crap out, some dude down the tyre shop isnt more correct, plus the load rating on most 4wd tyres could easilly support the entire load with 1 tyre.
Author:  felix [ Fri Feb 13, 2009 1:56 am ]
Post subject:  Re: What size tyre and pressure do you run?
Exactly, if you realise what the LT (light truck) tyres we run are designed for, you'll know why our little zooks only need lower pressures.
Author:  Taff [ Fri Feb 13, 2009 2:45 am ]
Post subject:  Re: What size tyre and pressure do you run?
i have only ever run 20 max on the road.

dont see any point going higher. if your worried about handling in a zook with muddies you must be on drugs anyway.
Author:  mike_nofx [ Fri Feb 13, 2009 2:49 am ]
Post subject:  Re: What size tyre and pressure do you run?
Cade wrote:
just checked my tyres

they are actually 225/70/15 max pressure 35psi

i just thought that was how much you are menat to inflate too

DOWN she goes :)

run on 32 for the trip to exmouth


Open your door and look at the white sticker on the side of the dash.
The tyre wall says MAX! They are designed to fit a range of cars not just zooks.

I run 20 psi front and 30 psi rear ON road. 30 psi for rear is because of welded diff, makes it a bit easier on tight turns.

8-10 psi off road.
Author:  BlueSuzy [ Fri Feb 13, 2009 4:24 am ]
Post subject:  Re: What size tyre and pressure do you run?
I run 26-28psi with my 33's..

Under 26psi i can feel the car slowing quicker as the tyres grab the road more.
Over 28psi i can feel the car jolting and bumping all over the place like its on ice.

I run 12psi offroad, Scared of popping a bead...
Author:  joeblow [ Fri Feb 13, 2009 6:04 am ]
Post subject:  Re: What size tyre and pressure do you run?
twitchy wrote:
Jesus h christ Joe, where the flying frog fuck did ya dig that bit of gold from????? The Higher the pressure the worse the braking?
Low air pressure will INCREASE bad handling & braking. Out of all the above mentioned pressures If I was on the the tar I'd rather be with Cade or Jnr if something hairy happened.


we have done the tests............i'm not talking purely off road settings, i'm talking about new tyres, new compund and sidewall, size, volume and vehicle weight. a car has an 'ideal' setting that will see it perform well in all conditions, go above this and braking suffers, go too far below and cornering with speed suffers, etc, etc.measure out a strech of road, than hit the brakes at 40 psi and see how far before you stop, then do the same at 20 psi, you will notice the vehicle stops a bucket load shorter before locking brakes. simple maths....try it yourself....i had to.
Author:  oscar [ Fri Feb 13, 2009 6:08 am ]
Post subject:  Re: What size tyre and pressure do you run?
31/15/8 simex et's
22 on road
6 offroad, a hour or 2 later 1 or 2 tyres has 0 in em.
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