You should replace a tire immediately if the sidewall has any cuts, bulges, cracks, or punctures deeper than 1/16 inch (about the thickness of a penny’s edge). Sidewall damage is not repairable because the sidewall flexes and bears weight, so any compromise can lead to sudden failure. Never patch or plug a sidewall; only a new tire can keep you safe.
Types of Sidewall Damage That Require Immediate Replacement
Not all sidewall damage looks the same, but the rule is: if you see it, replace it. Here are the most common types and why each demands a new tire.
Cuts and Gouges
Any cut that exposes the inner cords or is deeper than 1/16 inch is a blowout waiting to happen. Even a small cut can grow as the tire flexes. If you can see fabric or steel belts, the tire is unsafe. Replace it before driving.
Bulges and Blisters
A bulge or blister means the internal structure is broken and air is pushing against the outer rubber. This is a sign of imminent failure. A bulge can burst at any time, especially at highway speeds. Replace the tire immediately.
Cracks and Dry Rot
Weather cracks or dry rot are common on older tires. If cracks are more than 1/16 inch deep or you can see the inner layers, the tire is compromised. Tires over six years old with cracking should be replaced regardless of tread depth.
When Can You Drive on Minor Sidewall Damage?
Honestly, almost never. But there are a few scenarios where damage might be superficial. Scuffs from a curb that only affect the rubber surface and are less than 1/16 inch deep can be monitored. However, if the scuff has any depth or you see cords, replace the tire. Also, if the tire is near the end of its life (tread below 2/32 inch), replace it anyway. A damaged sidewall on a worn tire is a double risk.
If the damage is a small nick that doesn’t expose cords and is shallow, you can have a tire professional inspect it. But most shops will recommend replacement because the risk is too high. There is no safe repair for sidewall damage.
How to Inspect Tire Sidewalls for Damage
Check your tires monthly, especially after hitting a pothole or curb. Look for cuts, bulges, cracks, or punctures. Run your hand around the sidewall (wear gloves) to feel for irregularities. If you find anything suspicious, measure the depth with a penny. Place the edge of a penny into the cut; if it goes past Lincoln’s forehead (about 1/16 inch), replace the tire. Also check the inside sidewall if you can, as damage can occur there too.
Remember, sidewall damage is not repairable. Patching or plugging a sidewall is dangerous and illegal in many places. The only safe option is a new tire. For more tips on tire care, check out our guide on tire maintenance.
Frequently Asked Questions
Can a tire shop repair a sidewall puncture?
No, reputable tire shops will not repair sidewall damage. Industry standards from the Tire Industry Association and Rubber Manufacturers Association state that sidewall repairs are not safe. The sidewall flexes too much, and a patch or plug can fail, causing a blowout.
How long can I drive on a tire with sidewall damage?
You should not drive at all. Even a short trip to the tire shop is risky. If you must move the car, keep speed under 30 mph and go directly to a shop. But the safest option is to install the spare or call for roadside assistance.
Is it safe to use a tire sealant on sidewall damage?
No. Tire sealants are only for tread punctures and are not designed for sidewall damage. Using sealant on a sidewall can mask a serious problem and lead to sudden failure. Never use sealant on sidewall cuts or bulges.
The Bottom Line
Replace any tire with sidewall damage deeper than 1/16 inch, cuts exposing cords, bulges, or cracks. There is no safe repair. Driving on a damaged sidewall risks a blowout and loss of control. When in doubt, have a professional inspect the tire, but expect to buy a new one. Your safety is worth the cost. For more information on tire care, check out our tire category.
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