Signs Your Tyres Need Replacing

Knowing when to replace your tyres is crucial for safety. While the legal minimum tread depth is 1.6mm, there are many other signs that indicate your tyres need attention. This guide helps you identify when it's time for new tyres.

1. Low Tread Depth

Tread depth is the most obvious indicator that tyres need replacing. The legal minimum in the UK is 1.6mm, but safety experts recommend replacing tyres when tread reaches 3mm. At 3mm, stopping distances in wet conditions increase significantly compared to new tyres.

Use the 20p test: insert a 20p coin into the tread grooves. If the outer band is visible, your tread is below the legal limit. Modern tyres also have tread wear indicators - small raised bars in the grooves that become flush with the tread at 1.6mm.

2. Age of the Tyres

Even if tread depth appears adequate, tyres should be replaced based on age. Rubber degrades over time due to exposure to sunlight, heat, and ozone, even if the vehicle isn't driven frequently.

Most manufacturers recommend replacing tyres that are 5-6 years old, regardless of tread depth. Tyres older than 10 years should never be used, even if they appear in good condition.

3. Sidewall Damage

The sidewall is the tyre's weakest point. Damage here is particularly dangerous as it can lead to sudden tyre failure. Look for:

• Bulges or blisters: Indicate internal structural damage, often from hitting curbs or potholes
• Cuts or gashes: Deep cuts can expose the internal structure and lead to failure
• Cracks or crazing: Fine cracks indicate rubber degradation from age or UV exposure
• Missing chunks: Significant damage that compromises tyre integrity

Any visible sidewall damage warrants immediate professional inspection. In most cases, sidewall damage cannot be repaired and the tyre must be replaced.

4. Uneven Wear Patterns

Uneven wear indicates underlying problems and may necessitate tyre replacement:

5. Vibration or Noise

Unusual vibration or noise while driving can indicate tyre problems:

• Constant vibration: May indicate tyre imbalance, flat spots, or internal damage
• Thumping noise: Often caused by flat spots from hard braking or prolonged parking
• Humming or roaring: Can indicate uneven wear or tyre defects
• Squealing in corners: May suggest under-inflation or worn tread

While some issues can be resolved through balancing or alignment, persistent problems after these services suggest the tyres need replacing.

6. Frequent Punctures

If you're experiencing frequent punctures, it may indicate:

• Tyre tread is too worn to resist penetration
• Previous repairs have weakened the tyre structure
• Tyre rubber has degraded and become brittle

While punctures can often be repaired, repeated punctures in the same tyre suggest it's time for replacement. Additionally, tyres with more than two repaired punctures should be replaced for safety.

7. Exposed Cords or Fabric

If you can see the internal cords or fabric through the tread or sidewall, the tyre is dangerously worn and must be replaced immediately. This level of wear indicates the tyre has no remaining safety margin and could fail at any moment, especially at high speeds or in adverse conditions.

8. Poor Performance in Wet Conditions

If you notice decreased grip in wet weather, longer stopping distances, or increased tendency to aquaplane (lose contact with the road surface), your tyres likely need replacing. Tread depth below 3mm significantly reduces water dispersion capability, increasing the risk of aquaplaning.

When to Replace vs. Repair

Not all tyre damage requires replacement. Here's when repair is possible:

Conclusion

Regular tyre inspections help you identify problems early, before they become safety hazards. If you notice any of the signs discussed in this guide, have your tyres professionally assessed. At IQ Tyres, we stock a wide range of quality tyres to suit all vehicles and budgets, and our expert team can help you choose the right replacement tyres for your needs.