Ignoring these five tyre warning signs could cost you your licence, your vehicle, or your life. Glasgow's Top Tech team shares the red flags every driver must know.
In the UK, driving with a tyre below the legal tread limit or in a clearly dangerous condition is an offence that carries a fine of up to £2,500 and three penalty points per tyre. In a worst-case scenario, a dangerous tyre can cause a fatal blowout or dramatically increase stopping distances in an emergency. Here are the five signs you absolutely must not ignore.
Sign one: A bulge or bubble in the sidewall. This is almost always caused by an impact – hitting a pothole, mounting a kerb, or a heavy collision. It indicates internal structural damage where the cords inside the tyre have broken, allowing air to push through the outer rubber layers. A sidewall bulge is a blowout waiting to happen and must be replaced immediately – it cannot be repaired. Sign two: Tread depth at or below 1.6mm. Use the 20p test or a tread depth gauge. In wet conditions, even approaching this limit greatly increases stopping distances.
Sign three: Visible cracks or cuts in the sidewall or tread. These indicate the rubber is degrading due to age, UV exposure, or chemical contamination. A cracked sidewall can fail suddenly under load. Sign four: The tyre is more than ten years old. Rubber compounds break down over time even if the tyre appears visually intact. Check the four-digit DOT code on the sidewall – the last four digits show the week and year of manufacture. A tyre marked 3218 was made in the 32nd week of 2018. Sign five: Persistent and rapid pressure loss. If you're topping up the pressure every week, there's a slow puncture, a faulty valve, or a damaged bead that needs professional attention.
If you recognise any of these signs on your tyres, don't drive further than necessary. Call Top Tech Mobile Tyres in Glasgow on 0141 673 5765 and we'll come to you for an inspection and replacement if needed.
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