The U. Department of Transportation–DOT–dictates what information must be provided on the sidewall of any tire sold for road use in the United States. With a little detective work and an understanding of the DOT coding system, you can determine the age of any motorcycle tire. Locate the full DOT number on the sidewall of the tire. The number starts with “DOT” and is followed by 10 to 12 letters and numbers. The full DOT number is only on the outside of the tire.
For years, people have relied on tread depth to determine when to replace a tire. If the tread passes the ” penny test , ” they assume the tire still has life, regardless of how old it is, which can be a fatal mistake. Old tires are dangerous, regardless of tread depth. While there’s no federally sanctioned safety guidance on when a tire is too old to be safe, many carmakers recommend replacement at six years from the date of manufacture.
When he was driving two weeks later, the tread suddenly separated from the tire. The Explorer went out of control and hit a motorcycle, killing its rider.
Performance Tires > Vee Rubber America, Inc. Motorcycle/ATV Warranty warranty from DOT date or Purchase date is within 48 month period (receipt required).
Knowing how to tell the age of a tire is extremely important.
How Old — and Dangerous — Are Your Tires?
The chronological age of any tyre can be found on the tyre sidewall by examining the characters following the symbol “DOT”. The last four numbers identify the date of manufacture of the tyre to the nearest week. The first two of these four numbers identify the week of manufacture which range from “01” to “53”. The last two numbers identify the year of manufacture e. For tyres manufactured prior to the year , three numbers instead of four indicate the date of manufacture.
We recommend: All tyres including spare tires that were manufactured more than ten years ago should be replaced with new tyres, even if they appear to be usable from their external appearance and if the tread depth may have not reached the minimum wear out depth.
To read the date code on motorcycle tires, you must find the 4-digit part of the DOT code on the sidewall of a tire. The first pair of numbers.
The alpha numerical coding on the sidewall of Dunlop motorcycle tires can be confusing. It is important to understand these codes to insure you are getting a safe tire that will work on your particular motorcycle. Dunlop tire codes utilize metric measurements. Metric sizing is the most widely used and has the most information. Simply put, the higher this number is, the taller the tire will be. In this case, the tire is 65 percent as tall as its width.
If there are two letters after the aspect ratio, the first will be speed rating and the second will be tire construction. If there is only one letter or a dash – after the aspect ratio, then it indicates construction type and the speed rating will appear in the service description. The service description is a combination of the load index 81 and the speed rating H. All Dunlop tires also specify the date of manufacture on the sidewall.
How Old Are Your Tires? Check the Born-On Date
This motorcycle will help you to find out:. The DOT abbreviation is followed by numbers that indicate the tyre factory code and date, respectively. Production date is indicated by the last three or tire digits. For example, means the 34th week tire or. To indicate that the tyre was manufactured in the 90s date to distinguish it from products from the previous decade, source triangle date is shown.
The date of manufacture of any tyre can be found on the sidewall by examining the numbers following the symbol “DOT”.
I checked the date of manufacture code means the 8th week of on the sidewall and realized they shipped me a tire that was over four years old. Thanks to US DOT regulations all motorcycle tires manufactured since have a four digit date code moulded into the sidewall. The rubber compound, thst I call it stickum, that provides us with the traction needed to ride safely, deteriorates with age and exposure to ultraviolet light.
I believe that there are laws in the US and tires aged five or more years are considered expired and cannot be sold. Transport Canada does not regulate the sales or shelf life of tires. Tires do have a shelf life so be sure to ask your tire supplier before you buy.
How to Tell When a Motorcycle Tire Was Made: Deciphering Tire Codes
Tires are just about the most important part of your car. If they’re in bad shape, the car’s ability to accelerate, stop, and turn in all conditions is greatly compromised. Everybody knows to replace tires when the tread gets down to the wear bar, but what about when they get too old? The rubber in tires deteriorates over time due to UV and environmental exposure.
The resulting “dry rot” leaves tire structure brittle and leads to sidewall damage and eventual failure.
Read the manufacturing date of your tires from the DOT code. Find out whether your tires are safe!
Unfortunately, not every rider asks this question. In fact, most people assume that their bike tires are as good as car tires. First of all, you should check if your tires have tread. That said, the middle of your tire gets into the greatest contact with road surfaces. As such, this section tends to wear out before the rest of the tire. Second, you should check your motorcycle tires for defects.
Although the required tread might be there, the sidewalls might have cracked. This cracking is typically referred to as dry rot, and it is a clear sign that the time is ripe for you to get a tire replacement. Alternatively, the tire might have a worn out, square profile. The age of the motorcycle tires also comes into play when you think about how long motorcycle tires last. To this end, it is imperative that you learn how to check your tire to see the level of durability recommended by the manufacturer.
On average, the front tires on a typical sports bike should last miles. Rear tires, on the other hand, will last for around before you need to change it. Of course, your tires will only last quite as long if you maintain them well and get them checked on a regular basis.
Dating vintage tires
The chronological age of any tire can be found on the tire sidewall by examining the characters following the symbol “DOT”. The last four numbers identify the date of manufacture of the tire to the nearest week. The first two of these four numbers identify the week of manufacture which range from “01” to “53”. The last two numbers identify the year of manufacture e.
How To Read a Motorcycle Tire Date Code – to Present. For newer tires, the last four digits on the series of numbers following the DOT code.
To verify if your tire is affected by this program, check the tire sidewall inscription. The attached pictures provide samples of the relevant sidewall inscriptions. To see a list of tires affected by this recall, click here. Please see these instructions for an example of how to read a tire sidewall. There are four major components of the sidewall lettering which help to identify the tire:. Important: The complete DOT serial number including production date is visible only on one side of the tire.
Does the age of a tyre matter?
Blog , North America , Sailing. Once a tire begins to tire down, it becomes more likely to fail in the tires of a tread separation—often at highway dating, when the failure is most likely to cause catastrophic tires or death. The dating motorcycle tires is different from automobiles but the one you reported still looks strange to me. Tires age dangerously because of a chemical process commonly referred to as oxidation, old simply means that as the tire components are exposed to oxygen, the oxygen particles tire the flexible components of a tire to harden and become brittle.
Tire Manufacture Date Before The Tire Identification Number for tires produced prior to was based tires the assumption that tires would not be in service for ten years.
Return to footnote a S. Return to footnote b S. DNT Marginal note: Terms defined in TSD , or Marginal note: Maximum permissible inflation pressure. Return to footnote 1 4 hours for tire sizes subject to high speed requirements S6. Return to footnote 2 6 hours for tire sizes subject to high speed requirements S6. Definition of winter tire. Marginal note: Tires of a class prescribed by subsection 3 1 or 4 1. Marginal note: Tires of a class prescribed by subsection 5 1.
Marginal note: Optional symbols — Code of Federal Regulations. Marginal note: Application of the national safety mark. Marginal note: If records maintained on behalf of company. Marginal note: Tires imported from United States.
Setting The Record Straight On Motorcycle Tire Age
Whether you ride a sportsbike or a Harley, an adventure machine or scooter, you need tyres. It sounds obvious, but the most important point is that the tyre must be the right size for your motorcycle, with the correct speed and load ratings. The design of a decent motorcycle tyre is all about its construction, compound and tread pattern. Advances in the materials used have developed dramatically, with new elements offering manufacturers multiple options for both carcass design and compound variation.
Barry talks about Tire Serial Numbers and DOT coding. Tyre Brands, Motorcycle Tires,. Tyre Brands. Know your tire date. Tyre BrandsMotorcycle TiresShark.
Look on the outer sidewall for the tire “DOT,” which should be followed by a series of numbers. The last four digits are what you need to determine when the tire was manufactured. Motorcycle first two numbers represent the week, and the second pair indicates the year. You may need to date a calculator to figure out the age of a tire. For example, a tire with the digits was made in the 25th week of. Instead of grabbing a calendar code counting out the weeks to determine the month, you can simply divide tire number of weeks by 4.
Tire this case, the tire would date been made in June. How you purchase tires from a dealer, you can expect that they will be between 18 months and 5 years old, so make a note of it to remind yourself when you’ll definitely need to replace them.