tyre pressure

What sort of vehicle are you driving.

Cheers,
John

Try dropping around 10psi from your road pressures & then adjust from there.
Did you say Cooper STs? Take plenty of spares!

Allyson52,

I have a system for determining tyre pressures. I call it the 25% rule.

I work on 4 types of road conditions highway, good dirt, rough dirt/fire trail and soft sand.

I run about 44psi on the highway. When I go onto good dirt I drop my tyre pressure by about 25% so in this case 10 or 11psi. They are now about 32 to 34psi. I can still travel at reasonably high speeds but it is a bit easier on everything.

When the road deteriorates again, rough fire trail kind of thing, I drop tyre pressure by 25% again. This time it is about 8 tto 10psi so the tyres end up at about 24psi. At these pressures I don't often get over 80k/h but the road usually determines that.

When I leave the fire trail and hit the soft sand, like Simpson Desert or Stockton I drop the tyre pressure by about 25% again. This time it is about 6 or 7 psi so they end up at about 18psi. Once again I modify my speed as a concession to the conditions and the tyre pressure.

Now this is a guide not a strict rule. so these are just starting points. I will adjust pressures depending on how they feel.

This works for me and helps me to work out what sort of pressure I need based on what the road is like when I arrive.

Feel free to use this system, modify it or simply ignore it

Duncs

a 2002 holden rodeo xtra cab

Hi Allyson52

Start at 20% lower than your standard highway pressures. With the reduced tyre pressures will also come a reduction in speed.


Cheers


Stephen

allyson
40 in the black stuff

22-25 on gravel roads ( most outback roads ) and never over 70km/hr

12-15 in sand or rough tracks.....never over 40 km/hr


22 - 25 is my most used pressures, no matter what weight my Patrol is !

Cheers
Bucky