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tyres

Checking your tread

Checking your tread

How to Check your tyre tread

Your tyre tread plays a vital role in traction, braking, and wet-weather safety. In Australia, the legal minimum tread depth is 1.5 mm, but for best safety and performance, replacing tyres at 3 mm is recommended — especially before long trips or wet seasons.

Checking your tread depth is quick, easy, and can be done at home using one of the methods below.

Checking your tread

Checking your tread depth

Use the Built-In Tread Wear Indicators (TWI)

All tyres sold in Australia have small raised bars inside the grooves, called Tread Wear
Indicators.

How to check them:

  • Look inside the tyre grooves for small raised bars.
  • When the tread is worn down to the same height as the bars, your tyre is at or
  • below 1.5 mm.
  • If the indicators are flush with the tread anywhere around the tyre, it’s time to replace the tyre.


TWIs are the quickest way to see if your tyres are nearing their limit.

Use a Tread Depth Gauge (Most Accurate)

A tread depth gauge is cheap and gives a precise reading in millimetres.

How to use it:

  • Place the gauge into the deepest groove of the tyre.
  • Push the gauge down un:l it sits flat on the tread.
  • Read the measurement.


Repeat this across multiple points on the tyre — inner edge, centre, and outer edge — to identify uneven wear (which may indicate alignment or inflation issues).

Use the “20-Cent Coin Test” (Quick & Reliable)

This is a common Australian trick for a fast tread check.

How it works:

  • Take a 20-cent coin.
  • Insert it into the tread with the platypus’s bill facing down.
  • If the bill is partially covered, your tread is above 3 mm.
  • If you can see the entire bill, your tread may be too low for wet-weather safety.
  • If the coin sits shallow in the groove, your tyre may even be below 1.5 mm, making it illegal to drive

Check All Four Tyres (and the Spare!)

Tread wear can vary between tyres. Make sure to check:
How it works:

  • Both front tyres
  • Both rear tyres
  • The inner and outer shoulders
  • The centre strip
  • Your spare tyre if you have one


Uneven wear can indicate under-inflation, over-inflation, alignment issues, or suspension problems.

When Should You Replace Your Tyres?

You should replace your tyres if:

  • Tread depth is 1.5 mm or less (legal minimum)
  • Tread wear indicators are flush with the surface
  • Tread is low on one side
  • Tyres feel unsafe in the wet
  • You no:ce cracks, bulges, or damage

Need Help Checking Your Tyres?

If you’re unsure about your tread depth or notice uneven wear, visit Nerang Tyre Service. We’ll happily check your tyres for you — no obligation, just friendly advice

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