First decide whether you are looking at a bulge or an indentation
A protruding area can indicate damaged internal cords or plies. Treat it as a structural tire problem rather than a cosmetic defect.
Radial tires can show shallow indentations where internal body-ply cords overlap. That shape is different from an outward bubble pushing away from the sidewall.
A curb mark alone does not prove internal failure, but deep cuts, exposed structure, pressure loss, or a new vibration need professional evaluation.
What to do after you find a true sidewall bubble
- 01Stop high-speed driving
Reduce exposure to highway speed and heavy loads. If the tire is on the vehicle when you notice the bulge, move only as needed to reach a safe stopping position.
- 02Use the spare or arrange towing
Follow the vehicle's spare-tire instructions if a usable spare is available. Otherwise, roadside or towing assistance avoids loading a tire whose internal structure is already compromised.
- 03Have the wheel and nearby suspension checked after a hard impact
A pothole or curb strike can damage more than the tire. Ask the shop to inspect the wheel, pressure loss, alignment clues, and other tire damage rather than replacing the tire in isolation when the impact was severe.
Information that helps the tire shop understand the failure
- Photos of the bulge before the tire is removed
- Whether it appeared after a pothole, curb strike, or other impact
- Any wheel dent, scrape, or crack near the damaged area
- Current tire pressure and whether pressure has been dropping
- Any new vibration, thumping, pulling, or steering change
- Tire size, load specification, and the vehicle's door-placard recommendation
Stop and get help
Do not inject sealant, plug the sidewall, or keep driving to see if the bubble grows
A sidewall bulge is not the same repair category as a small tread-area puncture. The concern is damaged structure inside the tire. Temporary puncture products do not restore those cords or plies, and continued driving can end in sudden failure.