What Damages Tyres? Common Causes

Tyres lead a hard life, and plenty of everyday things shorten it, some gradually, some in an instant. Knowing the common causes is how most of them are avoided, and knowing which damage is fixable and which is final is how a tyre problem is judged.

Wrong pressure

The most constant cause is incorrect pressure. Running too low or too high wears the tyre unevenly and shortens its life, as covered across the pressure guides. It is slow rather than sudden, but over a tyre's life it does more damage than any single impact, and it is entirely free to put right.

Impacts: kerbs and potholes

The sudden damage mostly comes from impacts:

• A pothole can cut the tread, dent the wheel, or weaken the sidewall
• A kerb strike scuffs and stresses the sidewall, where a bulge may appear days later
• A hard hit can knock the alignment out, leading to scrubbed, uneven wear

A bulge or a cut reaching the cords from an impact is replace-now damage, the structure is compromised and can fail without warning.

Overloading and heat

Carrying more than the car and tyres are rated for makes them flex and overheat, which breaks the rubber down and risks a failure. Long motorway runs at speed, fully loaded or towing, are where heat damage builds, which is why there are higher pressures for a full load to keep the tyre supported.

Chemicals and the elements

Tyres are also attacked by things they sit in or under:

• Oil, petrol and solvents degrade rubber on contact
• UV and ozone harden and crack it over time, the slow ageing that ends even unused tyres
• Standing still for long periods both flat-spots and ages a tyre

Punctures and sharp objects

Then there is the everyday puncture, a nail, screw or sharp debris. Many are repairable if they fall in the right place, but the rules on what can be repaired decide that, and a puncture run flat or in the sidewall is not.

Fixable or final?

The useful split is between damage that can be lived with or repaired and damage that ends the tyre:

• Repairable or manageable: a small tread puncture in the right zone, minor scuffs, correctable pressure or alignment wear caught early
• Replace now: a sidewall bulge, a cut to the cords, exposed cord, or sidewall damage

When damage falls into the replace-now group, fitting a sound new tyre is the safe answer rather than nursing one that could let go, easy enough to order online from Tyres.co.uk and have fitted at a local garage. Most of the avoidable causes, though, come back to the same simple care that makes a set last.

From the workshop: the one people don't expect is the kerb bulge that turns up a week later. They scuff a kerb, think nothing of it, and the sidewall's been weakened inside. Few days on, there's an egg-shaped lump. That tyre's done, and it started with one careless kerb.

Sources and accuracy. The damage causes and the repair-or-replace split here reflect TyreSafe and manufacturer guidance at the time of writing. Anything safety-critical should be confirmed with a professional. If anything here looks wrong, get in touch and we will check it and put it right.