Your car’s tyres play a crucial role in safety, handling, and fuel efficiency. Over time, they wear out, affecting your vehicle’s performance and putting you at risk on the road. But how do you know when it’s time for a replacement? Checking your tyres regularly can help you spot warning signs before they become dangerous. If your tyres show any of these warning signs, it’s time to get them replaced. A professional tyre service ensures you get the right tyres for your car, improving safety and performance. If you’re in Dorset, consider a tyre replacement in Bournemouth from a trusted local garage to keep your vehicle in top condition.
1. Check the Tread Depth
Tread depth is one of the most critical factors in determining tyre condition. The UK legal limit for tread depth is 1.6mm, but experts recommend replacing tyres when the tread drops below 3mm for better grip, especially in wet conditions.
How to Check Tread Depth
- The 20p Test – Insert a 20p coin into the tread grooves. If the outer band of the coin is visible, your tread is too shallow, and it’s time for a replacement.
- Tread Wear Indicators – Many tyres have built-in wear indicators—small rubber bars in the grooves. If these bars are level with the tread, the tyre needs replacing.
2. Inspect for Cracks and Sidewall Damage
Tyres naturally degrade over time, even if they have enough tread left. Exposure to heat, UV rays, and harsh road conditions can cause cracks along the sidewall. These cracks weaken the tyre structure and increase the risk of a blowout.
Signs of Sidewall Damage
- Visible cracks or cuts along the sidewall
- Bulges or bubbles on the tyre’s surface
- Deep scuffs from kerb damage
If you notice any of these issues, replacing your tyres is essential for safety.
3. Look for Uneven Wear Patterns
Uneven tyre wear can indicate underlying issues like misalignment, suspension problems, or incorrect tyre pressure.
Types of Uneven Wear
- Centre Wear – Overinflated tyres wear out in the centre faster than the edges.
- Edge Wear – Underinflated tyres wear more on the edges than the middle.
- Patchy Wear – If certain spots wear faster, it could be a sign of wheel imbalance or suspension issues.
Regularly rotating and aligning your tyres can help prevent uneven wear, but if the damage is severe, replacement is necessary.
4. Check for Bulges or Blisters
A bulge or blister on the tyre means the internal structure has been compromised. This is often caused by hitting potholes, kerbs, or driving over speed bumps too aggressively. These weak spots can lead to a sudden tyre failure, making immediate replacement essential.
5. Monitor Air Pressure Loss
Tyres should maintain a consistent air pressure level. If you find yourself frequently inflating your tyres, there might be a slow puncture, a damaged valve, or an issue with the tyre itself.
How to Check Tyre Pressure
- Use a reliable pressure gauge to measure each tyre’s PSI.
- Compare it with the manufacturer’s recommended pressure, usually found in your car’s manual or on a sticker inside the driver’s door.
If a tyre loses air too quickly, it might be time for a replacement rather than constant refilling.
6. Pay Attention to Vibrations While Driving
Unusual vibrations while driving can signal a tyre issue. While some vibrations may result from wheel imbalance, persistent shaking often indicates internal tyre damage. If balancing and alignment checks don’t resolve the issue, a tyre replacement may be the only solution.
7. Consider the Tyre’s Age
Even if your tyres have plenty of tread left, their age matters. Tyres deteriorate over time due to environmental exposure and rubber breakdown. Most manufacturers recommend replacing tyres every six to ten years, regardless of usage.
How to Check Tyre Age
- Look for the DOT code on the tyre’s sidewall.
- The last four digits represent the manufacturing date (e.g., "3420" means the tyre was made in the 34th week of 2020).
If your tyres are over six years old, have them inspected regularly, and replace them if necessary.
8. Check for Foreign Objects and Punctures
Nails, glass, and other debris can puncture tyres, causing slow leaks or sudden deflation. While some punctures can be repaired, those near the sidewall or too large to fix require a full replacement.
When Can a Puncture Be Repaired?
- If it’s within the central three-quarters of the tread.
- If the hole is smaller than 6mm in diameter.
- If the tyre structure remains undamaged.
If the puncture doesn’t meet these conditions, replacing the tyre is the safest option.
9. Check for Dry Rot or Weathering
Tyres exposed to extreme temperatures, sunlight, and moisture can develop dry rot, causing the rubber to become brittle. Signs of dry rot include:
- Cracking along the tread and sidewall
- Hard, flaky rubber
- Visible discolouration
Driving on dry-rotted tyres is dangerous, as they are prone to splitting and blowouts. If you notice any signs, replace your tyres immediately.
10. Verify Wheel Alignment and Suspension Health
Misaligned wheels and faulty suspension components can cause tyres to wear out faster. If your vehicle pulls to one side or your steering feels off, check your alignment. A professional tyre service can ensure your wheels are properly aligned before fitting new tyres.
When to Replace All Four Tyres
While replacing a single tyre may seem cost-effective, sometimes changing all four is the best choice.
Replace All Four If:
- All tyres are worn out evenly.
- You’re switching to seasonal tyres (e.g., winter or all-season).
- Your current set is over six years old.
If only two tyres need replacing, fit the new ones on the rear axle for better stability and grip.
Final Thoughts
Regular tyre checks are essential to ensure your vehicle remains safe and roadworthy. From tread depth and air pressure to sidewall damage and punctures, knowing what to look for can help you avoid unexpected breakdowns. If your tyres are worn, old, or damaged, don’t delay—replace them before they become a hazard. Safe driving starts with good tyres!
