The first two numbers indicate what week of the year it was made out of 52 weeks per year , and the second two numbers represent the year. For example, would reveal that a tire was manufactured during the 52nd week of the year Prior to the year , DOT coding was slightly different.
If you have a tire that doesn't match the coding you see in our example, it was likely manufactured before and should be retired as a safety precaution. If you're a driver who swaps out tires for the season — winter tires replace your summer tires and back again — proper storage of your tires in the off-season will help protect them from the elements and delay the aging process.
It's always a good idea to have a tire professional inspect your tires when having them reinstalled on your vehicle after storage. Similar to other tire wear and performance factors, age can and will affect the performance of tires, and therefore overall vehicle safety and capability. Not sure how old your current tires are?
Tires are constructed of many organic, natural materials. Like other organic materials, the rubber compounds in a tire degrade with time.
A general rule of thumb is a tire has a maximum life of about ten years. Beginning at five years, tires should be annually inspected for condition and signs of age-related degradation. Even if they appear to be in usable condition and have not worn down to the tread wear indicator.
This applies to spare tires as well. Yes, there can be. Dry rotting and cracking are common with aged tires. It can take a while for tires to reach tire retailers after being shipped from the manufacturer. Our storage locations are cool, climate-controlled, and dry, preventing any premature aging or damage. Tire aging can be rapidly accelerated by poor storage conditions, so you should be sure the tires you purchase have been properly stored.
A general consensus from various tire industry associations around the world is that tires have a useful service life of six to ten years. As technology changes, there are more materials, and combinations of comounds, to extend tire life and extend wear. At Tires Easy, we like to err on the side of caution and only sell tires that are seven years old and under.
If you consider that the average driver travels 15, miles per year, most tires need to be replaced in 4 years. If your tires were a few years old when purchasing, you would still be well within the accepted tire age range. This is especially true if the tires receive the proper amount of care and maintenance over the course of their lifetime.
Legally, you must replace your tires when the tread depth falls below 1. This keeps your tires at optimal levels of safety. When your tires reach seven years of age, we recommend that you consider replacing them. The character DOT code, shown in the red box, appears on the inside of tires.
Recently, some tire manufacturers have begun to stamp partial codes on the outside of tires facing away from the vehicle so that checking the date does not necessitate removing the wheel. This partial code, boxed in yellow in Figure 1, is the most important piece of information about a tire. These last four digits of the DOT code represent the manufacture date of the tire. The last two digits refer to the year the tire was produced, and the first two digits identify the week number within that year.
The tire shown in Figure 1 was manufactured on the 36th week of the year That tire was on a trailer that had been sitting in a field unused for 10 years, and it showed signs of dry-rot cracking.
It is unclear whether trailer tires should be replaced every six years since they do not receive the same daily punishment as automobile tires. However, automobile tires should be replaced every six years.
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