How to Read Date Code on Motorcycle Tires: Key Facts and Guidance

The date code on a motorcycle tire is usually the final four digits of the DOT tire identification number. The first two digits show the production week, and the last two show the production year; for example, 2423 means the tire was made during the 24th week of 2023.

The practical difficulty is finding the complete code and knowing what it does—and does not—tell you. A motorcycle tire may show the full DOT sequence on one sidewall and only a partial sequence on the other, so the visible markings may not include the four-digit date. The code identifies when the tire was manufactured, not when it was installed, sold, or first ridden.

This guide explains where to look, how to separate the date digits from the rest of the DOT marking, and how to handle older three-digit codes. It also covers tire age, storage, visible damage, replacement decisions, and situations in which the date code alone cannot establish whether a tire is safe. After reading, you should be able to decode the marking, estimate a tire’s age, and decide when a closer inspection or professional advice is warranted.

Where the Motorcycle Tire Date Code Appears

Look along both sidewalls for a marking that begins with DOT. The complete tire identification number can contain letters and numbers describing the manufacturing plant, tire size or construction, and other manufacturer-specific information. The date portion is at the end of that sequence.

Manufacturers often mold the full DOT code into only one sidewall. The opposite side may have an abbreviated code without the date, which is why checking just the outward-facing side can produce an incomplete answer. If the code is not visible, move the motorcycle carefully or ask a tire shop to inspect the inner sidewall.

The marking may be raised rubber, recessed lettering, or difficult to read because of dirt, chain lubricant, tire dressing, brake dust, or wear. Clean the sidewall with mild soap and water, then use a flashlight at an angle. Avoid scraping the rubber or using solvents that could damage it.

How to Decode the Four-Digit Date Code

For tires made in 2000 or later, the date code uses four digits. The first pair represents the calendar week, and the second pair represents the last two digits of the year.

• 0819: the eighth week of 2019
• 4521: the 45th week of 2021
• 0124: the first week of 2024

The week is not a precise day. A code such as 4521 tells you the tire came from the manufacturer’s 45th production week in 2021, but it does not identify the exact date within that week. For practical age calculations, use the beginning or middle of the stated week rather than treating the code as a specific day.

A valid modern week number normally runs from 01 through 52, with some production calendars recognizing week 53. A number outside a plausible range may have been misread, may not be the date portion, or may indicate that the tire marking needs further verification.

Example: Reading a complete DOT marking

Suppose the sidewall reads something like DOT ABCD 7K3M 2423. The letters and middle characters are identification information, while 2423 is the date code. The tire was manufactured in week 24 of 2023.

Do not assume that every group of four numbers on the sidewall is a date. Motorcycle tires also display size markings, load and speed information, rotation arrows, tubeless or tube-type designations, and other regulatory or construction marks. The date digits are the final four digits of the DOT identification sequence, not simply any four-digit number nearby.

What Older Three-Digit Codes Mean

A three-digit date code generally indicates a tire made before 2000. The first two digits identify the production week, while the final digit identifies the year within a decade. For example, 248 means the 24th week of a year ending in 8, but the code alone cannot tell you whether that year was 1988 or another decade-ending year.

Some pre-2000 tires include a triangle symbol after the three digits to indicate the 1990s. Even with that clue, a tire carrying a three-digit date code is exceptionally old for motorcycle use. The age, unknown storage history, and likely deterioration make replacement the appropriate safety decision rather than continued use.

A three-digit code should not be confused with a modern code in which a digit is hidden by dirt or sidewall curvature. If a tire appears relatively recent but the marking is unclear, inspect the entire sidewall and have a tire professional confirm it before relying on the reading.

How Tire Age Affects a Motorcycle

Rubber changes over time through oxidation, heat cycles, ultraviolet exposure, flexing, and contact with environmental contaminants. A motorcycle tire can lose useful flexibility and grip even when its tread still appears deep. This is especially important because motorcycles depend on a relatively small contact patch and tire behavior changes can affect cornering, braking, and stability.

The date code provides the tire’s manufacturing age, but it does not measure current condition. Two tires with the same code may have aged differently if one was stored indoors in a cool, dry location and the other spent years exposed to sunlight, heat, moisture, or repeated underinflation.

Service life also begins with use, not just manufacture. A tire that sat in a warehouse for a period before installation may have a different remaining service window than a tire installed immediately, while a heavily loaded, frequently ridden tire may experience faster wear and heat-related aging.

There is no universal date at which every motorcycle tire becomes unsafe. Tire manufacturers may publish age-inspection or replacement guidance, and those instructions should take priority. Many industry recommendations call for more frequent professional inspection as tires become several years old and replacement around a later age limit, often regardless of tread, but the exact policy depends on the manufacturer, model, use, and condition.

Use the code as one decision point rather than an automatic pass-or-fail test. A newer tire can be damaged or incorrectly maintained, while an older-looking tire may still require replacement even if it has plenty of tread remaining.

Signs a Motorcycle Tire May Need Replacement

Inspect both sidewalls and the tread when the tire is clean and properly illuminated. Look for conditions that indicate structural or rubber deterioration, not only ordinary tread wear.

• Cracks or weather checking: Fine cracks between tread blocks or along the sidewall can signal aging. Deep, spreading, or branching cracks are especially concerning.
• Bulges, blisters, or deformities: These may indicate internal damage or separation and require immediate removal from service.
• Cuts, punctures, or exposed cords: Damage that reaches the structure cannot be judged safely by appearance alone.
• Uneven or unusual wear: Cupping, scalloping, flat spots, and rapid edge wear can reflect inflation, suspension, alignment, loading, or riding issues.
• Tread at or below the wear indicator: Replace the tire when the tread reaches the molded wear bars or the applicable manufacturer limit.
• Persistent vibration or handling changes: A new wobble, pull, instability, or vibration deserves inspection even if the date code is recent.

Do not continue riding on a tire with exposed cords, a major bulge, severe cracking, suspected internal separation, or a serious puncture. Have the motorcycle transported or inspected by a qualified tire professional instead of testing the problem at speed.

Why the Date Code Is Not an Expiration Date

The four digits establish when the tire was produced, but they do not state an expiration date. They also do not reveal the tire’s complete service history, whether it was stored correctly, how many heat cycles it experienced, or whether it suffered an impact.

Conversely, the code does not prove that an older tire is automatically safe. A tire may have low mileage and full tread yet contain age-related cracking or have been weakened by long-term underinflation. Motorcycle tires should be evaluated by age, condition, fitment, maintenance, and use together.

Be cautious with a tire sold as “new” simply because it has never been mounted. New old stock can have substantial calendar age. Ask for the date code before purchase, especially when buying from an unknown seller, and compare it with the tire manufacturer’s guidance.

How to Check the Code Safely

1. Park the motorcycle on a stable surface and allow the tires to cool.
2. Read the sidewall markings on both sides of each tire, using a flashlight if necessary.
3. Find the marking that begins with DOT and follow it to its final four digits.
4. Record the week and year, such as 2423, rather than relying on memory.
5. Check the tread, sidewalls, bead area, and valve area for damage or aging signs.
6. Compare the tire’s age and condition with the manufacturer’s service guidance.
7. Ask a qualified motorcycle tire technician to confirm uncertain markings or questionable condition.

Never place a jack or stand under an unstable part of the motorcycle just to expose the inner sidewall. If access requires lifting the bike, use the motorcycle manufacturer’s approved support points or have a shop perform the inspection.

It is also wise to check the tire size, load rating, speed rating, rotation direction, and fitment separately. A correct date code cannot compensate for an incorrectly sized tire, an unsuitable rating, improper mounting, or an inflation pressure that does not match the motorcycle manufacturer’s instructions.

Common Mistakes When Reading the Marking

One frequent mistake is reading the first four digits after “DOT” instead of the final four. The earlier characters identify manufacturing details; the date is located at the end of the complete identification sequence.

Another mistake is checking only the visible side. If the date is missing, the full code may be on the inner sidewall. Do not conclude that the tire has no date code until both sides have been examined.

People also sometimes read a code such as 0722 as July 2022. It means the seventh production week of 2022, not the seventh month. Treating the digits as month and year can make a tire appear significantly newer or older than it is.

Finally, do not confuse the date code with the tire’s installation date. Keep a maintenance record showing when each tire was mounted, and record the date code with it. That information makes future inspections and replacement decisions more reliable.

FAQ About Reading Motorcycle Tire Date Codes

How do I read the date code on motorcycle tires?

Find the final four digits of the DOT identification number. The first two digits are the production week and the last two are the production year. For example, 3622 means week 36 of 2022.

Is the date code printed on both motorcycle tire sidewalls?

Not always. The complete DOT code, including the date, may appear on only one sidewall, while the opposite side shows a partial code. Inspect both sides before deciding that the date is absent.

What does a three-digit motorcycle tire date code mean?

A three-digit code generally identifies a tire made before 2000. Its first two digits show the week and its final digit identifies a year within a decade. Because the exact decade can be unclear and the tire is extremely old, it should not remain in motorcycle service.

Does a motorcycle tire date code show when the tire

No, it shows when the tire was manufactured. Installation, sale, and first use may have occurred later. Storage conditions and the tire’s service history also affect its current condition.

How old is too old for a motorcycle tire?

There is no single universal cutoff for every motorcycle tire. Follow the tire manufacturer’s age and inspection guidance, increase professional inspections as the tire ages, and replace it sooner if cracking, damage, abnormal wear, or handling problems appear. A tire’s date code should be considered with its condition and use.

Can a motorcycle tire with good tread still be unsafe

Yes. Rubber and internal materials can deteriorate even when tread depth remains acceptable. Cracks, hardening, bulges, separation, or age beyond the manufacturer’s guidance are reasons to stop relying on tread depth alone.

What should I do if I cannot read the date

Clean the sidewall, inspect the opposite side, and ask a qualified tire professional to identify it. Do not guess from nearby numbers or ride on a visibly damaged tire while trying to verify the code.

Conclusion: Use the Code With a Full Tire Inspection

Reading a motorcycle tire date code is straightforward once the complete DOT marking is located: the final four digits give the production week and year. The major limitation is that the code is not an expiration date and cannot reveal storage history, internal damage, or current grip. Record the code, inspect both tires carefully, follow the manufacturer’s age guidance, and have a professional evaluate any uncertain or damaged tire before riding.