How to Tell When Your Tyres Need Replacing — UK Driver's Guide

The most straightforward way to assess whether your tyres need replacing is to check the tread depth. In the UK, the legal minimum tread depth is 1.6mm across the central three-quarters of the tyre. Most modern tyres include built-in wear indicators — small raised bars running across the tread grooves. When the tread surface becomes level with these bars, the tyre must be replaced immediately.

Beyond tread depth, there are other important signs to watch for. Uneven wear across the tyre surface often points to a wheel alignment or tyre rotation issue. Bulges or bubbles on the sidewall indicate internal structural damage and make the tyre unsafe to drive on. Persistent vibration at motorway speeds can also suggest that a tyre has become deformed or is out of balance.

As a general rule, many tyre manufacturers recommend replacing tyres after five years of use regardless of visible wear, and certainly after ten years even if they appear to be in good condition. Heat, UV exposure, and road chemicals cause the rubber compound to harden and crack over time in ways that are not always obvious to the eye. A quick inspection by a professional can give you peace of mind — Castle Mobile Tyres is happy to check your tyres as part of any callout.