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Tyre Safety: ID numbers and registration

Tyres are critical to the safety of our vehicles and that of the public, as defective tyres can cause or contribute to injuries and deaths from accidents. Since the 2000 recall & replacement of more than six million tyres by Bridgestone/Firestone for Ford Explorers and other sport utility vehicles, tyre safety has been front-and-center for both the industry and the regulators. Louis_Rumao

Tyres are being recalled frequently, and as a recent example, Michelin is recalling around 104,000 BF Goodrich light-truck and recreational vehicle tyres, made in 2014 & 2015, and sold in the United States, because the sidewalls can rupture under severe use conditions. To enhance tyre and consumer safety, two initiatives are now in place – Tyre Identification Number and Tyre Registration.

Tyre Identification Number (TIN)

Current regulations require that Tyre Identification Numbers begin with the letters “DOT,” followed by ten, eleven or twelve characters (see photo below) that can be used to identify the manufacturing location, tyre size and manufacturer’s specifications, along with the week and year the tyre was manufactured. So, while DOT Tyre identification Numbers are commonly, but erroneously, referred to as the tyre’s serial number, unlike the serial numbers used on most other consumer goods that identify one specific item, Tyre Identification Numbers only identify production batches. Since 2000, the week and year the tyre was produced has been provided by the last four digits of the Tyre Identification Number with the 2 digits being used to identify the week immediately preceding the last 2 digits used to identify the year. In the example below, this tyre was manufactured during 51st week of year 2007.


By Louis Rumao

Full text in PTA October/November issue

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