The DOT Tire Identification Number (TIN) is a critical safety and compliance marker required on passenger, light truck, and specialty tires sold in the United States. It encodes the tire’s manufacturer, size, and production details, helping owners and inspectors track tire history and recalls. This guide explains where to locate the TIN, how to read it, and why it matters for maintenance, safety, and regulatory compliance.
What Is A DOT Tire Identification Number
The TIN is a 10-character code that begins with the letters “DOT,” followed by two or more codes that identify the manufacturer and plant, tire size, and a unique serial number. In recent formats, the final character group may include a production week and year, aiding traceability during recalls or warranty checks. Understanding the TIN helps verify authenticity, track production dates, and confirm compliance with federal safety standards.
Where To Locate The TIN On Passenger And Light Truck Tires
The DOT mark and TIN are molded directly into the tire sidewall near the inner edge of the tread or at the shoulder area. On most passenger and light truck tires, the DOT code appears as a raised sequence in black on the sidewall. Look for the DOT logo followed by the alphanumeric string; if the sidewall is scuffed, try another locale around the circumference where lettering remains legible.
Tin Location On Other Tire Types
For some regional or specialty tires, the TIN may appear on a different portion of the sidewall or near the rim bead. Retread tires and commercial tires can show the DOT code in slightly altered formats, but the first two letters after “DOT” consistently indicate the manufacturer. Always inspect multiple sections of the sidewall if visibility is limited due to tread wear or branding patterns.
How To Read The Tire Identification Number
Begin with the “DOT” prefix, then read the subsequent characters to identify the manufacturer, plant, tire size, and production date. In modern tires, the production date is typically encoded as a four-digit week-year pair (for example, “2319” means week 23 of 2019). Knowing how to decipher the TIN helps assess tire age and potential risk factors in safety maintenance and recalls.
Why The DOT TIN Matters For Safety And Compliance
The TIN is tied to federal safety standards and recall notices. It enables manufacturers and the National Highway Traffic Safety Administration (NHTSA) to pinpoint affected lots and production runs. Checking the TIN during inspections, purchases, and prior to long trips reduces the risk of unknowingly using expired or defective tires and supports warranty claims.
Tips For Inspecting And Verifying Your TIN
- Inspect in good lighting to ensure the DOT code is legible; use a flashlight if needed.
- Match the date code to the tire’s age; most manufacturers recommend replacing tires around 6–10 years from the date of manufacture, regardless of tread.
- Document the TIN when buying used tires or storing spares for quick recalls or warranty checks.
- Check for recalls by cross-referencing the TIN with NHTSA recall notices or the manufacturer’s site.
- Seek professional help if the code is partially worn or obscured by damage or decals.
