What Is Tyre Tread Depth?
Tyre tread depth refers to the measurement of the grooves in your tyre. These grooves are designed to channel water away from the surface of the tyre, maintaining contact with the road.
When tread becomes too shallow, especially in wet conditions, your stopping distance increases and the risk of aquaplaning rises significantly. For Irish weather, where wet roads are common year-round, maintaining safe tyre tread depth is essential.
What Is the Legal Tyre Tread Depth in Ireland?
In Ireland, the minimum legal tyre tread depth is 1.6mm across the entire circumference of the tyre and throughout the central three-quarters of the tread width.
If your tyres fall below 1.6mm:
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You may receive penalty points
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You can be fined
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Your vehicle may fail its NCT
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Your insurance could be affected in the event of a claim
While 1.6mm is the legal minimum, many safety organisations recommend replacing tyres at 3mm, particularly before winter, as grip performance drops sharply below this level.
How to Check Your Tyre Tread Depth
A tread depth gauge is inexpensive and gives the most reliable reading.
How to use it:
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Insert the probe into the deepest groove of the tyre.
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Press the gauge flat against the tread.
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Read the measurement in millimetres.
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Repeat at several points around the tyre.
Check the inner, middle and outer sections to ensure even wear. Modern tyres have built-in tread wear indicators – small raised bars located inside the grooves. If the tread is level with these bars, your tyre is at or below 1.6mm and must be replaced immediately.
The 20 Cent Coin Test – Quick Check
Insert a 20 cent coin into the main tread groove.
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If the outer band of the coin is visible, your tread may be close to or below the legal limit.
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If it is covered by the tread, you are generally above the minimum.
This is a rough guide only – a proper gauge is more accurate.
Signs Your Tyres Need Replacing
Replace your tyres if you notice:
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Tread depth close to 1.6mm
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Uneven wear patterns
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Cracks or bulges in the sidewall
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Vibration while driving
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Reduced grip in wet conditions
If you are unsure, a professional inspection can confirm whether replacement is needed.
Professional Tyre Checks at Modern Tyres
At Modern Tyres, we provide free tyre safety checks at all our branches across Ireland. Our trained technicians will measure your tyre tread depth accurately and advise whether your tyres are safe, close to replacement, or need immediate attention.
If replacement is required, we stock a wide range of leading tyre brands to suit every vehicle and budget. You can also explore our range of tyres online and book fitting at your nearest branch.
