Most of us don’t spend too much time looking at our tire sidewalls, at least until something serious catches our eye, like a bubble on the side of the tire. Then, we wonder if it’s really a big deal. After all, it’s not a flat tire, so how bad can it be?
The unfortunate truth is that finding a bubble on a tire sidewall is a dead giveaway for internal tire damage. And, left unaddressed, that damage can increase the risk of sudden tire failure, especially at higher speeds.
Luckily, tire bubbles are relatively easy to identify, and taking appropriate action sooner rather than later can save you a world of trouble down the road. Below, we’ll explain what a tire bubble is, what causes it to form, whether it can be repaired, and what to do if you discover one on your vehicle.
Key Takeaways
- A tire bubble is an irreversible visible bulge that forms when the tire’s internal structure has been damaged.
- Potholes, punctures, curbs, road debris, and underinflation can cause a bubble to form.
- A bubble on a tire sidewall cannot be safely repaired because the tire’s internal support layers (plies) have likely already been compromised.
- Driving on a tire with a bubble increases the risk of a blowout, especially at highway speeds.
- Professional tire inspections can determine whether replacement is needed and help you choose the right tire for your vehicle.
What Is a Tire Bubble, and Is It Dangerous?
Although tires look like solid rubber from the outside, they’re actually built with layers of reinforcing materials that help them maintain their shape under load. These layers are sealed off from the air inside the tire by an inner liner. If that inner liner is damaged, air pressure can push outward between the layers, creating a visible lump or air bubble in the tire’s sidewall.
It’s tempting to write off a tire bulge as a mere cosmetic concern, but that couldn’t be further from the truth. Unlike a flat tire, which is clearly unusable, a tire bubble is more like a ticking time bomb. While it may hold air and rotate normally (for a short distance), a tire with a bulging sidewall is at serious risk of a blowout. Pair a blowout with highway speeds — which is when they most often occur — and your vehicle is sent careening.
So, are tire bubbles dangerous? Absolutely.
What Causes a Tire Bubble?
Typically, tire bubbles form due to impact damage. But they don’t always show up immediately. Many drivers discover a sidewall bubble days after hitting a pothole they barely remember. The impact may have damaged the tire internally, even though there was no obvious sign of trouble at the time. If you’re trying to retrace your steps to figure out what caused your bubble, these are some of the most common culprits of impact damage:
- Deep potholes
- Curbs
- Road debris
- Railroad crossings
- Driving too fast over speed bumps
However, not every bubble is caused by an impact. Sometimes, tire bulges can occur due to:
- Low Tire Pressure: Driving on underinflated tires can cause excessive sidewall flex and heat buildup, placing additional stress on the tire over time.
- Overloading Your Tire: When tires consistently carry more weight than they were designed to handle, the likelihood of developing bubbles increases.
- Manufacturing Defects: It’s rare, but if a relatively new tire develops a tire bulge without an obvious cause, a tire manufacturer's defect could be at fault.
- Overinflation: Excessive internal pressure in an overinflated tire can stretch the rubber and stress its internal structure, potentially leading to a tire bubble.
- Punctures: While most punctures simply cause air loss, a puncture that damages the tire's internal cords can weaken the tire's structure and contribute to a bubble forming.
Regardless of the cause, tire bubbles aren’t something you want to leave unaddressed. If your tire has any unusual bubbles or bulges, Firestone Complete Auto Care can inspect the damage, confirm whether replacement is needed, and help you choose the right tire for your vehicle and driving conditions.
How to Fix a Tire Bubble
The short answer? You can’t.
Unlike nails through tire treads, which may cause a flat tire but can often be repaired safely, a bubble only develops when the tire’s internal support layers have been damaged. Every mile you drive, the sidewall flexes thousands of times, placing stress on that weakened area.
Once those internal cords have been compromised, there’s no way to restore the tire’s original strength. Patches, plugs, sealants, and other temporary fixes can address air loss in certain situations, but they cannot repair underlying structural damage. For that reason, replacement is typically the only solution.
Tire Bulge FAQ/TLDR:
Why Does My Tire Have a Bubble?
Most bubbles are caused by impact damage. Hitting a pothole, curb, or road debris can damage the tire’s internal structure or pinch the tire against the rim, creating a sidewall bulge.
Can You Drive with a Bubble in Your Tire?
It’s not recommended. A sidewall bubble indicates internal damage that can cause your tire to fail unexpectedly.
Can You Fix a Bubble in a Tire?
Not typically. Once the tire’s internal cords are damaged, replacement is the only solution.
Think Your Tire Has a Bubble? What to Do Next:
A bubble or lump on the tire sidewall usually means the tire’s internal structure has been damaged and may no longer be safe to drive on. Your local Firestone Complete Auto Care offers tire inspections, repairs, and replacement services to help ensure your vehicle remains reliable.
Our technicians can evaluate tire damage, confirm whether replacement is needed, and install the right tire for your vehicle’s size, driving habits, and performance needs. Visit our Tire Services page to learn more, or check the Offers page to see if there’s a coupon available for a tire check or service near you.
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Article Development Supported & Reviewed By:
Firestone Complete Auto Care’s Technical Operations Team
The Firestone Complete Auto Care’s Technical Operations Team is composed of ASE certified technicians with over 70 years of combined experience. ASE certification represents the highest standard of technical training in the automotive industry. Guided by Firestone Complete Auto Care’s rigorous editorial standards, our team delivers timely, detailed, and practical resources drivers can trust to keep their vehicles running newer, longer.
