Getting your tyre pressures right when you’re heading off-road costs nothing, yet it can gain you so much.

There are three key benefits to getting your pressures dialed in;

1. It allows the tyre to flex and mould around an obstacle, avoiding punctures and tears when the going gets tough.
2. It keeps more tyre tread in contact with the terrain which gives you more traction and float on the soft stuff.
3. And more traction means less track damage due to unnecessary wheel spin – meaning less track closures.

But because every 4WD, tyre and driver are different, there is no one-size-fits-all solution to the perfect pressures. Bearing that in mind, here’s a few professional tricks to help you determine what the perfect tyre pressure is with your 4WD when hitting any terrain.

To make sure your tyre pressures are running at their optimum and balanced all around, we recommend using a high-quality tyre deflator or tyre gauge – the 4WD Action crew all use the Kwiky Tyre Deflator  which is available at 4WD Supacentre showrooms and Approved Dealers across the country. This handy devices allows you to dump stacks of excess pressure out of your tyre by capturing your valve core, and actuating a massive dump valve to drop pressure faster than just about any other way on the market and with it’s integrated Bourdon tube gauge, which gives an extremely accurate readout every time!

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Don’t forget to bring your portable 12v air compressor to get back up to pressure when you get back to the highway to head home!

SAND DRIVING

On the sand, start by dropping your tyres down to about 16psi with your Kwiky Tyre Deflator. If you begin noticing wheel spin or your tyres start digging down, drop a few more PSI out. But remember, once your tyre pressures are that low, you need to drop your speed and avoid sharp turns, or you could peel your tyre right off the rim.

DIRT ROAD TOURING

When it comes to corrugated high-speed dirt tracks, running around the 28psi mark and keeping your speed under 80km/h will help cushion the ride while still maintaining responsive handling. You do need to be careful not to go too low, or travel too fast, or there’s a good chance the tyre will overheat.

FIRE TRAILS

18-22psi is usually a good pressure to start with for low-range dirt tracks like fire trails. You need lower pressures to maximise your traction. Caution is required though, because if the tyre or sidewall nudges a rut or rock while you’re running too low, you might end up popping the bead off the rim.

ROCK CRAWLING

You’ll generally have a higher chance of popping the bead off the rim over rocky terrain, when compared to other terrains, so experimenting between 14psi and 22psi while keeping a close eye on the wheel is your best bet. One downside to low tyre pressures is a slight loss of ground clearance. Take 35in tyres on a GQ Patrol for example. It will loose 10mm of diff clearance for every 10psi dropped.

SLIPPERY MUD

Mud can be difficult to get right because each mud hole is different from the next. One school of thought suggest a slightly higher tyre pressure of around 22psi, which allows the tyre to slice down through the sloppy top layer and actually bite down into the harder crust beneath. Others believe the bigger your tyre footprint, the more grip on hand, so they aim for a lower pressure of around 14psi.

WATER CROSSINGS

Depending on the surface below, aim between 18-22psi as starting pressures when tackling water. It’s important to remember that the more air that remains in your tyres, the more buoyancy your 4WD has, and so the greater the chance of it slipping off course in flowing water.

It’s important to know that every 4WD and tyre is different, so the trick is to experiment to find the best results for your 4WD.

FIND THE PERFECT TYRE PRESSURE – GUARANTEED!

The 4psi rule can be used across any vehicle, on any terrain, to determine the best pressure for your tyres and the speed you are travelling. It goes like this…

Starting with cold tyres, set the pressures you think best suits the TERRAIN and SPEED. Go for a drive for about an hour to allow the tyres to warm up, and then pull over and check the pressures again.

If they have gone up by more than 4psi, then the starting pressure was too low and you’ll need to add a couple of PSI per tyre next time. If they have gone up by less than 4psi, then your starting pressures were too high and you could drop a couple of PSI out.

The only thing to keep in mind is that this doesn’t take into account the possibility of rolling the tyre off the rim, so your safest bet is to go no lower than 14psi, unless extenuating circumstances arise.