Thread: tyre pressure

Hi again,

Tyre pressures and the Meaning of Life eh :wink:

There is the 4 PSI rule that says that the tyre pressures are right if after say 20 minutes of highway speed driving the pressure of the tyre when measured warm is 4 PSI higher than the pressure when measured cold....hmmmmm...far too scientific for me (I'm into Intelligent Design Not).

35 PSI is a good start and then experiment as it depends on the load and the road temperature and the speed and the roughness of the road and the ambient temperature etc etc

Start with the placarded recommendations.

Don't to be too precious about pressures for day to day driving except if they are below 30 PSI and above 40 PSI on road.

You're on the right road though.

<span style="color:blue">lurch runs 40psi front and rear when i remember to check them........



your recommended tyre pressures should be 28 front and 38 rear.......

most of us reckon that 28 in the front is way too soft for on road......</span>

In the ford we run 32psi and in the fenda I run between 40 and 50 psi. Good on the fuel but might be a hard ride but then muds on a defender aint designed for the ultimate ride comfort anyway 8)
I up it to 50 for long trips and just check them every now and then normally and up them to at least 40 if they are low.

i run

hi way 40
long drves onthe dirt 30
sand 20

Hi Dullbird
Chasing fuel economy I put my Disco2 tyres(Cooper Discoverer ST 255/70x16) up to 34 front and 36 rear.I have just dropped them back to 32 front 34 rear as it was too harsh with our POO QUALITY ROADS(I work on roads for a living and there is a huge room for improvement,roadtrains are destroying our roads)
I was running30/32 and will drop back to that if the ride is still too hard.
My Disco has done 205000Ks so it probably needing a set of new shocks.
Andrew

I like simple numbers, so I run the fender 300kpa rear (280 placard), and 200 kpa front (190 placard).
In english that translates to 29psi and 43.5 psi.

Tyres are 235/85/16 Grabbers, (standard rubber off the showroom floor).

Trev.

I generally run 38-40psi front and 40-42 psi rear. I find too low in the front makes the steering less responsive and causes premature wear. Sometimes there is a big difference in what the car manufacturer and the tyre manufacturer recommend. Most 4x4 tyres I have used recommend 35-40psi and some up to 50psi. On normal sedan tyres it is lower and I normally runn these at 32-35psi.

I have 265/75/16 Muds on my D2 with fairly firm suspension and I normally run the following.

Road (day to day) - 30psi all round
Longer road trip - 35psi all round if empty, 35fr 40r if loaded
Short gravel road sections - 28 all round
Off road, rocks, low range stuff - 22psi

I have just gone by feel really but have found these to be adequate. Speed is really the dictating factor when dropping pressures.

Good luck