Glossary

Tire Identification Number

Last reviewed: 2026-05-20

The full identifier molded into the tire sidewall beginning with "DOT." It includes the plant or manufacturer code, tire type or size code, optional manufacturer characters, and the four-digit date code at the end. Tire Identification Number requirements are covered in 49 CFR Part 574 and support recall identification and tire recordkeeping.

Record the full TIN, not just the date code, when logging tire history. The date code tells production week and year, but the full identifier is needed to compare against a recall, manufacturer notice, or casing tracking record. On dual assemblies, record each tire separately.

Real-World Use

A fleet manager tracking tires for recall purposes notes the full TIN for each tire so the entire identifier is available if a recall is announced for a specific production range. A photo of only the last four digits would not be enough to complete the search.

Reference Sources

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

Gov 49 CFR Part 574 - Tire Identification and Recordkeeping (Electronic Code of Federal Regulations, reviewed 2026-05-20)
Gov Electronic Tire Identification Study (National Highway Traffic Safety Administration, 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.