Tyre Bulge or Sidewall Damage: Why You Must Not Drive On It

A bulge in your tyre sidewall is a sign of internal structural damage. Continuing to drive on it risks a sudden blowout at speed. Here's what to do.

A tyre bulge (also called a tyre bubble) is one of the most dangerous conditions a tyre can develop. It indicates that the internal fabric and steel belt structure of the tyre has been damaged, and the outer rubber layer is all that's containing the air pressure.

What Causes a Tyre Bulge?

Tyre bulges are almost always caused by impact damage: - Hitting a pothole at speed - Kerb impact - Driving over a large object

The impact causes the internal cords (the tyre's structural "skeleton") to snap. The outer rubber then balloons outward where the structure has failed.

Why It's So Dangerous

A tyre bulge can fail at any time — at low speed in a car park or at 70mph on a motorway. There is no warning before a sudden blowout occurs. Unlike a slow puncture, a bulge-related blowout is instant and violent.

What To Do If You Find a Tyre Bulge

1. 1Do not drive on the tyre
2. 2If you're at home, call for mobile tyre replacement immediately
3. 3If driving, safely reduce speed and pull over carefully
4. 4Do not attempt to repair a bulge — the tyre must be replaced
5. 5Inspect the wheel for rim damage as well

Can a Tyre Bulge Be Repaired?

No. A tyre with a sidewall bulge cannot be repaired safely. It must be replaced. Eddie's Mobile Tyres can come to you within hours for emergency tyre replacement — don't risk driving on a bulging tyre.