What Causes Bulges on the Side of Car Tires?
2 Answers
If a vehicle has a bulging tire, it can be driven for short distances but should not be taken on highways. Bulging tires are prone to blowouts, and the only solution is to replace the tire. The reasons for tire bulging are as follows: 1. The tire has exceeded its shelf life and started to age; hitting a rock or speed bump while driving can cause a bulge. 2. Low tire pressure leads to compression of the tire, which over time results in bulging. 3. The tire was replaced with a retreaded tire during a tire change. 4. Driving quickly over rough roads or speed bumps, especially when the tire is compressed while airborne over a speed bump, can cause bulging over time as the vehicle's weight rapidly presses down on the tire.
I've experienced tire sidewall bulges several times, and it nearly gave me a cold sweat. Bulges mainly occur when the internal tire cords break or shift, usually due to hitting potholes or curbs - that kind of impact can deform the structure. Tire aging is another common cause; after several years of use, the rubber hardens and becomes brittle, making the sidewalls prone to bulging, especially when underinflated. Overloading also puts excessive stress on the sidewalls, accelerating bulge formation. While rare, manufacturing defects can sometimes cause issues even in new tires. From a safety perspective, bulges can lead to sudden blowouts at any moment, with potentially catastrophic consequences at highway speeds. I make it a habit to check tire pressure monthly, maintaining the manufacturer's recommended levels, avoiding overloading with heavy cargo, and driving slowly on uneven roads. If you spot a bulge, replace the tire immediately - don't delay, as life is priceless. Choosing high-quality tires can also reduce this risk.
