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Tyre Pressure

When you think about it, the most important aspect of your vehicle is your tyres. Whether its on the road or off the road, tyres are the only contact between you and the rough surface beneath.


Tyre Pressure
It is estimated up to a quarter of all drivers and vehicle operators drive or operate with over or under inflated tyres. In regards to passenger, truck and light truck applications 95% of the vehicles weight is supported by the air tyre pressure. Correct tyre pressure can vary from vehicle to vehicle and wheel to wheel. Not having the correct tyre pressure in your vehicle can lead to all sorts of problems including, but not limited to:

  • Wear more quickly / unevenly;
  • Reduce fuel efficiency; and
  • May shred or blow out.

It is a good idea to check tyre pressure regularly. At least once a month is adequate and ideally you should check the pressure whilst the tyres are cold. Under inflated tyres can cause all sorts problems.

You should also inspect the tyres for any abrasions or bulges and check for general tread wear.

How to read a tyre

Upon first sight of a tyre you may notice number and letters stamped on the sidewall of the tyre. These numbers relate to the size of the tyre, for example: 255/70R22.5.

Section Width
The first three numbers (255) indicate the section width of the tyre in millimetres, which is the width of the tyre from sidewall to sidewall.

Aspect Ratio
The second numbers, in this case 70, denote the aspect ratio of the tyre which is the height of the tyre sidewall measured as a percentage of the width. 

Radial
The R stands for Radial Construction.

Diameter
This is the diameter of the wheel (in inches) that the tyre has been designed to fit on, in this example the rim diameter is 22.5 inches.

Tread Depth

It is essential that all vehicles have sufficient tyre tread depth to ensure no loss of vehicle control occurs.

The tread depth determines how much traction the tyre has with the surface below.

Tread depth gauges can be used to measure the tread depth of a tyre.


Tread Cuts

Description:
Injury exposing tyre cords in the tread area of the tyre.

Possible Causes:
Mechanical effects of sharp edged objects (stones, glass, metal etc.)

Rectification:
Tyres with deep localised cuts should be repaired by tyre experts.


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