Glossary

Zipper failure

Last reviewed: 2026-05-20

A sudden lateral sidewall rupture that can occur when a tubeless tire that was run flat or severely underinflated is reinflated. The internal cords may have been damaged by heat and flexing even when the outside of the tire does not show obvious damage. When pressure is added, the weakened sidewall can release violently along a zipper-like line.

Use an inflation cage, clip-on air chuck, remote inflation line, and OSHA-required procedures when reinflating any tire that may have been run flat or severely low. Do not stand beside the sidewall during inflation. If the tire history is unknown, treat it as suspect until a trained tire professional inspects it.

Real-World Use

A shop technician reinflating a tire that arrived completely flat places it in a restraining cage per OSHA requirements. The tire is not simply aired up on the floor because prior underinflation history is unknown and zipper failure risk is elevated.

Reference Sources

Sources used for context and verification of regulatory thresholds, inspection criteria, and compliance references on this page.

Gov 29 CFR 1910.177 - Servicing multi-piece and single piece rim wheels (Electronic Code of Federal Regulations, reviewed 2026-05-20)

What to Pair It With

Read this term with the full tire sidewall, vehicle rating information, manufacturer documentation, and the actual condition of the tire.

This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.