What size of tire damage cannot be repaired?
3 Answers
It is recommended that tires cannot be repaired under the following circumstances: 1. Sidewall: The sidewall cannot be repaired. Even if repaired, there are significant safety hazards, so it is not recommended. 2. Tread: Holes penetrating the tread with a diameter exceeding 6mm cannot be repaired. 3. Bead: If there is bead damage or deformation, tread deformation, rubber corroded by chemicals, or damage caused by running flat. 4. Others: Other abnormal conditions cannot be repaired. For example: If signs of running flat are visible on the tire (such as sidewall abrasion marks, inner liner bubbles, etc.), it is not worth repairing as the tire structure may already be compromised and unsafe for further use.
Last time my car broke down and I took it for repairs, the mechanic told me there are many cases where a tire puncture cannot be fixed. For example, if the puncture is larger than 6 millimeters or located on the sidewall, the tire is basically done for because the steel belt layer inside is damaged. Even if you patch it, it won’t be reliable—it could leak air or blow out while driving. I learned this the hard way: I tried saving money by patching a large hole, only to nearly have an accident on the highway. The mechanic said the general rule is: if the cut is wider than a nail, you should replace the tire. Location matters too—small repairs might be possible on the tread center, but damage to the shoulder or sidewall should never be repaired. When driving, watch out for gravel roads and potholes to avoid major damage, and regularly check tire pressure to prevent issues. Safety first—never skimp on that expense.
Having worked in automotive maintenance for many years, I've encountered countless tire issues. Whether a tire puncture can be repaired mainly depends on its location and size: small holes on the tread crown, such as those with a diameter not exceeding 6mm, can be safely patched; however, exceeding this size or damage to the sidewall ply makes repair a risky job. I've seen car owners patch large cracks to save a few dozen bucks, only to end up with a blowout mid-drive and pay much more. Repair methods are also limited—hot patches are suitable for small wounds, while large holes can only be temporarily fixed with unreliable plug strips. I advise car owners not to take risks; if the internal structure is damaged or there are multiple punctures, replace the tire promptly. Develop the habit of visually inspecting tire conditions monthly to nip potential problems in the bud.
