Measuring tyre tread depth and why it matters

Learn how to check tyre tread depth, why it matters, and tips for motorhome and caravan owners to stay safe on the road.


January 13, 2025

Ensuring your tyres are in good nick isn’t just a box to tick for roadworthiness—it’s about keeping you and your loved ones safe, especially when you’re out exploring Australia’s great open roads. Checking your tyre tread depth is a quick, simple task every RV enthusiast should know, whether you’re towing a caravan, camper trailer or driving a motorhome.

Why does tyre tread depth matter?

Tyre tread depth is critical for grip, especially in wet weather. As your tyres wear down, their ability to disperse water away from the contact surface reduces. This can lead to longer stopping distances, aquaplaning, and an increased chance of accidents. When towing, the last thing you want is compromised handling in wet or slippery conditions.

By law, your tyre tread depth must be at least 1.6 mm in New South Wales and 1.5mm in Queensland and Victoria. However, many experts recommend that you replace your tyres once the tread depth drops below 3 mm. That extra margin makes a big difference when towing, in wet weather performance, and in overall tyre capability, giving you peace of mind on the road.

tyre tread depth
RoadVenture AT52 © Kumho

How to measure your tyre tread depth

Checking your tyre tread is easier than you might think, and there are a few ways to go about it to measure its depth.

Look for the tread wear indicators

Some tyre brands (like Kumho Tyres), come with built-in tread wear indicators. These are small raised bars within the grooves of the tyre. When the tread wears down to 1.6 mm, these indicators will be flush with the tyre surface, signalling it’s time for a replacement.

Use a tyre tread depth gauge

For a more precise measurement, pick up a tyre tread depth gauge from your local auto parts store. These pocket-friendly tools provide an accurate reading, making it easy to track your tyres’ wear over time.

The Aussie coin test

Grab a 10- or 20-cent coin and find a mark on the coin that’s roughly 1.6 mm. Place the coin into the tread groove—if the mark is still obscured, you’ve got enough tread to keep things legal. If you’re aiming for the recommended 3 mm depth, use the same method with a mark at that height for extra reassurance.

Why are my tyres wearing down unevenly?

Uneven wear can point to issues with your vehicle’s steering or suspension, both of which can affect your tyre tread depth. If you notice one side of a tyre is wearing faster than the other or the wear looks patchy, it’s worth having your vehicle checked by a professional. This is particularly important for motorhomes and vehicles towing caravans, as uneven loads can exacerbate tyre wear.

Extra tips for RV travellers

  • Check your tyres regularly: Before every big trip, take a moment to inspect your tyres for wear, cracks, or bulges. Catching issues early can save you from headaches on the road.
  • Mind your loads: Overloading your motorhome or caravan can put unnecessary stress on your tyres, leading to faster wear. Stick to your vehicle’s load limits.
  • Rotate and align: Regular tyre rotation and wheel alignment will help ensure even wear and maximise tyre lifespan.
  • Consider the terrain: If your adventures often take you off-road, invest in tyres designed for mixed terrains to handle the extra demands of dirt and gravel.
tyre tread depth
RoadVenture AT52 © Kumho

Not sure about your tyres?

If you’re unsure about checking your tyres yourself or want a professional opinion, drop by your nearest Kumho Tyres dealer. They’ll inspect your tyres and provide advice regarding the tread depth.

Keeping your tyres in top shape isn’t just good maintenance—it’s your ticket to a safer, more enjoyable journey, whether you’re cruising the coast in a motorhome or tackling the Outback with a camper trailer in tow. With just a few simple checks, you can hit the road with confidence, knowing your tyres are ready for whatever lies ahead.

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Jessica Palmer
Jessica Palmer

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