Tire puncture repair guide
Can a punctured tire be repaired?
USTMA limits repair consideration to a tread-area puncture no larger than 6 mm. The tire must be removed and inspected internally, and the injury channel plus inner liner must both be repaired. Shoulder and sidewall damage are excluded; tire-maker policy still controls. Do not continue on a tire with a bulge, exposed or damaged cords, tread or sidewall separation, rapid pressure loss, or damage after it was driven flat. Use the spare or roadside assistance.
How-to steps
- Locate the puncture Inspect the tread area and confirm the damage is not in the sidewall, shoulder, bead, or run-flat post-event zone.
- Assess repairability Reject repairs where the hole is too large, angled, contaminated, too close to another repair, or the tire has been driven underinflated.
- Use an internal repair Demount the tire, inspect the inside, prepare the injury channel, install a plug-patch repair, rebalance, and leak-test.
What to do now
- Stop using the tire
- Do not continue on a tire with a bulge, exposed or damaged cords, tread or sidewall separation, rapid pressure loss, or damage after it was driven flat. Use the spare or roadside assistance.
- Arrange an inspection
- Have a trained tire professional inspect any cut, crack, puncture, hard impact, new vibration, noise, or repeated pressure loss before normal driving. An outside visual check cannot rule out hidden internal damage.
- Apply conservative repair limits
- USTMA limits repair consideration to a tread-area puncture no larger than 6 mm. The tire must be removed and inspected internally, and the injury channel plus inner liner must both be repaired. Shoulder and sidewall damage are excluded; tire-maker policy still controls.
Safety sources
These sources support the triage and repair boundaries above. They do not replace a hands-on inspection or the tire manufacturer’s policy.
Checked:
The repairable zone: where on the tire?
Not all punctures can be repaired. The fundamental rule is that only the central tread zone is repairable. The shoulder (the curved transition from tread to sidewall) and the sidewall itself are never repairable:
- The sidewall flexes constantly — any repair in the flex zone is subject to cyclic stress and can fail.
- The shoulder is a transition zone — the cords change direction here and patch adhesion is unreliable.
| Criterion | Repairable | Not repairable |
|---|---|---|
| Location on tire | Central tread — within 6 mm of each shoulder groove on each side | Shoulder, bead area, or sidewall |
| Object diameter | 6 mm or smaller | Over 6 mm |
| Injury path | Contained in the tread area after internal inspection | Extends into the shoulder or belt-edge area |
| Overall tire condition | Otherwise serviceable under tire-maker policy | Structural, inner-liner, run-flat, age, or wear damage found |
| Previous repairs | No overlap and no improper existing repair | Overlapping damage or an existing improper repair |
| Run flat or driven flat | Only if manufacturer policy permits and inspection finds no secondary damage | Heat, abrasion, creasing, or other run-flat damage is present |
Types of puncture repair methods
| Method | How done | Repair boundary |
|---|---|---|
| Plug-patch (combo repair) | Tire removed from rim; buffed from inside; plug inserted through hole; lap patch bonded over | USTMA limits repair consideration to a tread-area puncture no larger than 6 mm. The tire must be removed and inspected internally, and the injury channel plus inner liner must both be repaired. Shoulder and sidewall damage are excluded; tire-maker policy still controls. |
What should you do when you get a puncture?
- Do not brake hard or swerve suddenly — a deflating tire can cause the car to pull. Grip the wheel firmly and steer straight.
- Slow down gently — reduce speed gradually to avoid additional tire damage.
- Pull over safely — find a flat, safe area away from traffic as soon as possible.
- Do not drive on a flat tire — even a short distance at speed can destroy the tire's internal structure and eliminate the option of repair.
- Use your spare tire or call for assistance — use sealant only when the vehicle and product instructions permit it, and follow their speed and distance limits.
- Get the tire professionally inspected — even if it re-inflated after a sealant can, the cause must be identified and the tire properly repaired or replaced.
Should you leave the nail in until you reach a garage?
If the tire is still holding air, leave the object in place until a professional can assess it; removing it can accelerate pressure loss. Do not assume that pressure retention makes the tire safe to drive. Follow the vehicle and tire guidance, monitor pressure, and use a spare or roadside assistance if pressure is falling.
If the tire is already flat: do not drive. Use the spare or call for assistance.
Run-flat tires and punctures
Repair eligibility after run-flat operation depends on the tire manufacturer’s policy and a demounted internal inspection. Zero- or very-low-pressure driving can create hidden sidewall and inner-liner damage, so do not assume a run-flat puncture is repairable.
See our Run-flat tire guide for more on run-flat limitations.
Sealant gels — will they void the repair?
Tire sealant liquids (such as Slime or puncture seal sprays) coat the inside of the tire. When the tire arrives at a workshop for repair, the technician must clean the inside before buffing and applying the patch-plug. This adds inspection and cleaning work and may affect repair eligibility. Follow the sealant and tire manufacturer’s instructions; only a demounted inspection can determine whether the injury meets the repair criteria above.
More tools
- Sidewall damage guide
- Run-flat tire guide
- Tire tread depth guide
- Tire pressure guide
- Tire size calculator
- Tire & wheel reference guides
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tires are worn or the replacement size changes diameter.