Tire Date Code
When purchasing new trailer tires discuss the vendors product in terms of age to ensure the product that you are receiving has been recently manufactured.
Tire date code. In 1973 the average tread life of a passenger car tire was approximately 24000 miles. Use a flashlight to find the department of transportation code on the tire. Prior to 1991 tire speed ratings were shown inside the tire size before the r construction type. Most tire manufacturers warranties cover their tires for four years from the date of purchase or five years from the week the tires were manufactured.
The second two numbers are the year the tire was manufactured. Tire tread life has quadrupled over the last forty years and some currently sold tires promise 100000 miles of tread life. In the image below we see the 07 indicating the tire was build in 2007. For tires manufactured before the year 2000.
It is recommended to replace all trailer tires every 3 7 years. The available codes were sr 180 kmh 112 mph hr 210 kmh 130 mph vr in excess of 210 kmh 130 mph. The first two numbers are the week the tire was manufactured for instance in the example below 35 stands for week 35. Prior to 2000 the tire industry assumed that a tire would not be in service longer than ten years.
The dot code starts with the letters dot and is followed by 10 11 or 12 letters or numbers. Check the born on date. For example if the last 3 digits are 022 it means that the tire was manufactured in the second week of the year and the year is the second year of the decade. The date of manufacture is the last three digits of the code.
A tire with a dot code of 1116 was made in the 11th week of 2016. As such the date code consists of only three digits two for the week and one for the year. Tires expire in six years. The second two represent the year.
For more information read determining the age of a tire. To find your tires date code identify the code on the tire that begins with dot. The code will end in either three numerals pre 2000 or four post 2000 and correspond to the two digit week followed by the one or two digit year. As tread life becomes less of a factor in the service life of a tire oxidation becomes a more serious concern.
For instance the tire seen above has a code of dot da08 jm1r 3011 which would indicate a tire manufactured in the 30th week of 2011. The first two digits refer to the week within that year. This particular tire was made the 35 th week of 2007. Dot date code tells you.
Tires made before 2000 have a three digit code that is trickier to decode. Tires with a speed rating higher than 300 kmh 186 mph are indicated by a y in parentheses.