A scrape from a curb can look minor while damage inside the tire remains hidden. The sidewall flexes every time the tire rolls, so a cut, bulge, or crack deserves a careful check before you decide to keep driving. Here’s how to recognize the main types of damage and what should happen next.
What Counts as Tire Sidewall Damage?
The sidewall is the part of the tire between the tread and the wheel rim. It flexes as the tire supports the vehicle and absorbs road impacts. Damage can appear as a scrape, cut, puncture, crack, bulge, or exposed cords.
Some surface marks may not reach the tire’s internal structure, but appearance alone can’t confirm that a tire is safe. A cut or bulge can indicate damage beneath the outer rubber, even if the tire is still holding air.
Can You Drive on a Tire With Sidewall Damage?
Do not drive on a tire with a sidewall bulge, a deep cut, a puncture, exposed cords, or air loss. These signs can indicate structural damage and a risk of sudden tire failure. If you see one, move to a safe place if you are already on the road, then use a compatible spare if you can install it safely or call roadside assistance.
If the damage looks like a shallow scuff and there is no bulge or air loss, don’t use a photo or a “threads visible” test to decide whether it is safe. Have a tire professional inspect it before relying on the tire. If it is losing pressure, nearly flat, or visibly torn, don’t continue driving on it. See our guide to what to do with a flat or punctured tire.
Types of Sidewall Damage
Scuffs and Scrapes
A curb can rub or scrape the outer rubber. A surface mark may be cosmetic, but a gouge or cut can extend deeper than it appears. Don’t apply glue or sealant. Ask a tire professional to inspect the mark if you are unsure whether the tire’s structure is affected.
Cuts, Punctures, or Exposed Cords
A cut or puncture in the sidewall is different from a repairable tread puncture. If fabric or cords are visible, or air is escaping, take the tire out of service. Don’t try to plug or patch it yourself.
Bulges or Bubbles
A bulge or bubble can mean the internal cords have been damaged and air is pushing outward through the weakened area. The tire can fail suddenly. Don’t drive on a tire with a sidewall bulge; use a spare if safe or arrange roadside assistance.
Cracks
Small surface marks and deeper cracks are not the same. Cracking that opens when the tire flexes, exposes cords, or appears with other damage needs prompt inspection. A tire professional can check the sidewall and the inside of the tire for signs that are not visible from the outside.
Can a Tire Sidewall Be Repaired?
For passenger and light-truck tires, standard puncture repairs are limited to the tread area. A sidewall cut or puncture should not be repaired with an ordinary plug, patch, or glue. The U.S. Tire Manufacturers Association’s repair guidance limits these repairs to the repairable tread area and requires the tire to be removed from the wheel for inspection.
A tire that looks repairable from the outside may have additional damage inside, especially if it was driven while underinflated or flat. A tire shop should inspect the tire and explain whether it can remain in service or needs replacement. You can read more about what a proper tire repair involves.
What Causes Sidewall Damage?
- Hitting a curb or pothole, especially at speed
- Driving on a tire that is underinflated or overloaded
- Contact with a sharp object
- Age-related cracking or deterioration
An impact can pinch the tire between the road and the wheel rim, damaging the internal structure. The damage may show up as a bulge after the tire is reinflated. Check tire pressure regularly and use the pressure listed on the driver-side door placard or in the owner’s manual. See our guide to driving with low tire pressure.
Should You Replace One Tire or All Four?
There is no single replacement rule for every vehicle. Check the owner’s manual and tire-maker guidance, and have the shop compare the replacement tire’s size, type, and tread depth with the other tires.
Some all-wheel-drive and four-wheel-drive vehicles have strict limits on differences in tire circumference or tread depth. Depending on the vehicle and the condition of the other tires, the manufacturer may require more than one tire to be replaced. Don’t assume that every AWD or 4WD vehicle needs four new tires, or that replacing just one is always acceptable.
If two tires are replaced, general tire-industry guidance often recommends installing the new pair on the rear axle, but the vehicle manufacturer’s instructions take priority. Ask the installer to explain the recommendation for your vehicle.
FAQ
How much sidewall damage is too much?
A bulge, puncture, deep cut, exposed cords, or air loss means the tire should be taken out of service and inspected for replacement. A surface scuff can be harder to judge, so have a tire professional check it instead of relying on how deep it looks.
Can a small sidewall cut be plugged or patched?
Do not use a standard plug, patch, or glue on a passenger-tire sidewall. Standard puncture repairs are limited to the tread area. Have the tire inspected and replace it if the damage affects the sidewall structure.
Can I drive to a tire shop with a sidewall bulge?
No. A bulge can indicate internal damage and the tire may fail without warning. Use a compatible spare if you can install it safely, or call roadside assistance. Don’t drive on the bulging tire to reach a shop.
Does sidewall damage always mean all four tires need replacement?
No. The number of tires to replace depends on the vehicle manufacturer’s requirements and the condition and tread depth of the remaining tires. AWD and 4WD systems can have tighter matching requirements, so check the owner’s manual or ask a qualified tire professional.
