Knowing when to replace your tyres is one of the most important things you can do for your safety on the road. Fortunately, your tyres give you clear warning signs well before they reach a dangerous state — if you know what to look for.
Sign 1: Tread depth at or below 3mm. As discussed in our tread depth guide, the legal minimum is 1.6mm but safety experts recommend replacement at 3mm. Use the 20p coin test to check regularly.
Sign 2: Sidewall cracks or bulges. Cracks in the tyre sidewall indicate that the rubber is degrading — often due to age or UV exposure. A bulge is more serious: it means the internal structure of the tyre has been compromised and the tyre could blow out at any moment. Replace immediately.
Sign 3: Vibration or pulling. If your car pulls to one side or you feel unusual vibration through the steering wheel, it could indicate a tyre issue — either a pressure imbalance, wheel alignment problem, or internal tyre damage. A mobile tyre check can diagnose the issue quickly.
Sign 4: Visible damage — cuts, gouges, or embedded objects. A nail or screw embedded in the tread is not always an immediate emergency (slow puncture), but cuts and gouges to the sidewall are dangerous and the tyre should be assessed by a professional immediately.
Sign 5: Age over six years. Tyres degrade chemically over time regardless of mileage. Most manufacturers recommend replacing tyres over 10 years old, but at six years, you should have them professionally inspected. Check the DOT code on the sidewall — the last four digits show the week and year of manufacture.