A tire with a DOT code of 1109 was made in the 11th week of 2009. Tires with a three-digit code were made prior to 2000 and are trickier to decode. The first two digits still tell you the week, but the third digit tells you the year in the decade.
Car companies and tire companies have sent bulletins to dealers saying that tires older than six to ten years should be replaced. WATCH a video on how to tell the age of your tires. Fortunately, you don't have to depend on a professional to determine the age of your tires. The answer is right in front of you, written on the side of the tire itself. Every tire has a Tire Identification Number -- a serial number -- inscribed on its sidewall. On tires manufactured after 2006, the number is written on the sidewall that faces out and is easily visible. In fact, as all tires age they become more prone to losing their tread suddenly and causing an accident. According to the National Highway Traffic Safety Administration (NHTSA), when tires are older than six years, the chances of a sudden tread separation start to climb. Relevance. Rating Newest Oldest. Best Answer: Look on the side of the tire for the D.O.T. (department of transportation) serial number-look at the last 4 digits. The first 2 digits represent the week number it was made (for example 37 indicated the 37th week of the year), then the last 2 digits should be the year.  The second two represent the year. A tire with a DOT code of 1109 was made in the 11th week of 2009. Tires with a three-digit code were made prior to 2000 and are trickier to decode. The first two digits still tell you the week, but the third digit tells you the year in the decade that it was created. The hard part is knowing what decade that was. For years, people have relied on a tire's tread depth to determine its condition. But the rubber compounds in a tire deteriorate with time, regardless of the condition of the tread. An old tire poses a safety hazard. For some people, old tires might never be an issue. If you drive a typical number of miles, somewhere around 12,000-15,000 miles annually, a tire's tread will wear out in three to four years, long before the rubber compound doe How old are your tires? If you bought them recently, but they were sitting on a shelf for 5 years, they are old. To find out the age of the tire by reading the manufacturing date, look on the sidewall for a 3 or 4 digit number right after the DOT code. The number is printed inside of an oval shape. Time flies and tires age and become less safe. Here’s how you can check the age of your motorcycle tires. Look for an 11 or 12 character serial number on your tire’s sidewall. No, you don’t have to de-code that entire long number, just look at the last four digits (for tires made since the year 2000).  These numbers let you decode the date of manufacture of the tire. The first two numbers indicate the week; the last two the year. For example, 0510 indicates the tire was produced in the fifth week of 2010. Subtract the tire manufacture date from the current date to determine the tire's age. To get the month of manufacture, divide the weeks by 4.3. If it is October 2010 and the tire was manufactured in the twenty-fifth week of 2008, the tire's production month was June, making the tire two years and four months old.  The date of manufacture is the last three digits of the code. The first two digits refer to the week within that year. 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. For tires manufactured in the year 2000 – present. The date of manufacture is the last four digits of the DOT code. The first two digits are the week of manufacture, and the last two digits are the year. Those four numbers tell you the age of the tire. The first two numbers are the week of the year in which the tire was made; the last two numbers are the year. A tire made in the 47th week of 2008 – meaning November 2008 – would have a serial number ending in 4708. In fact, as all tires age they become more prone to losing their tread suddenly and causing an accident. According to the National Highway Traffic Safety Administration (NHTSA), when tires are older than six years, the chances of a sudden tread separation start to climb.
http://abcnews.go.com/Blotter/age-tires/story?id=13703169 https://answers.yahoo.com/question/index?qid=20080815115203AAk8fI3 http://www.edmunds.com/car-care/how-old-and-dangerous-are-your-tires.html http://www.youtube.com/watch?v=JM37mo9p90k http://motorcycleinfo.org/2008/06/motorcycle-tires-age/ http://www.ehow.com/how_6904540_tell-age-motorcycle-tires.html http://www.tirebuyer.com/education/how-to-determine-the-age-of-your-tires http://abcnews.go.com/Blotter/age-tires/story?id=13703169
how to tell age of tire