DETERMINING THE AGE OF A TIRE
The manufacturing date of a tire is incorporated into an 11 digit code, called a TIN (Tire Identification Number) located down by the bead of the tire. The only exception would be most Pro Drag Radials, which do not incorporate traditional TIN's. On street legal tires, the TIN is preceded by the letters "DOT".
The last four numbers of the TIN represent the week and year of manufacture. In the Example below, this tire was produced the 35th week of 2008.
EXAMPLE: CY1JM5FJ3508 (3508 = date code)
THE SERVICE LIFE OF YOUR M/T TIRES IS NOT ENTIRELY DICTATED BY CHRONOLOGICAL AGE.
All M/T tires are designed with conscience efforts to maximize tire life with maximum performance. That being said, the useful life of a tire is a function of its use, application, and storage conditions. Since these elements can vary widely, and are not controlled by the manufacturer, accurately predicting the life of any specific tire based on calendar age is near impossible.
However, with that understanding Mickey Thompson does recognize the benefit of a uniform approach regarding the service life issue. Accordingly, M/T has come up with the following age criteria for removing tires from service. These dates are based from the manufacturing date.
Race Tires – 4 years.
Bias Truck Tires – 8 years
Radial Light Truck Tires – 10 years
Passenger Tires – 10 years
Under no circumstances should these recommendations be consider as an "expected" service life. Most tires will need to be replaced before these time limits are met due to service conditions.
Tires can be removed for several reasons, such as:
Tread worn down to the minimum depth
Signs of damage (cuts, cracks, punctures, impact damage, etc)