How to Read Bridgestone Tire Date Code: Step-by-Step Instructions
The Bridgestone tire date code is the final four digits of the Department of Transportation (DOT) identification number on the sidewall. The first two digits show the week of manufacture, and the last two show the year—for example, 3522 means the tire was made during the 35th week of 2022.
Finding that code is usually easy; determining what it means can be less certain. The small detail that changes the decision is whether you have located the complete DOT number or only a partial version. Many tires display the full date code on one sidewall and a shortened DOT marking on the other, so reading the nearest visible numbers can produce the wrong conclusion about a tire’s age.
This article explains where to look, how to separate the DOT identification number from other molded markings, and how to interpret four-digit and older three-digit codes. You will also learn how to handle a code that is hidden against the wheel, what the date can and cannot tell you about safety, and when tread, cracking, damage, or professional inspection matters more than the calendar alone.
Where the Bridgestone Tire Date Code Appears
Look on the tire’s sidewall for the letters DOT, followed by a series of letters and numbers. The date code is normally the last four digits of that complete DOT Tire Identification Number (TIN).
The marking may be molded into the rubber rather than printed with ink, so it can be shallow, dirty, or difficult to see. Turn the steering wheel to improve access on a front tire, use a flashlight, and clean the sidewall with mild soap and water if necessary. Do not confuse the sidewall information with the air-pressure label on the vehicle doorjamb; the vehicle label lists recommended inflation pressure and size, not the tire’s manufacturing date.
A critical limitation is that the full TIN is not always visible from the outside. For easier manufacturing identification, a tire can have the DOT prefix and partial identification on one sidewall while the complete TIN, including the date code, is molded on the opposite side. This is common when the tire is mounted with the full code facing inward.
If the visible marking ends before four date digits, inspect the inner sidewall from behind the tire when safe. On a vehicle, that may require looking underneath with adequate lighting or having a tire shop check it. Never place any part of your body under a vehicle supported only by a jack.
How to Identify the Correct Number
Start at the molded DOT marking and follow the characters to the end of that identification sequence. The final four digits—not every four-digit number on the sidewall—are the manufacture date code.
Bridgestone sidewalls can include other numbers and letters for size, load index, speed rating, plant information, construction, and product identification. For example, a marking such as 225/65R17 102H describes tire size, construction, load capacity, and speed category. It does not provide the production date.
Use this quick identification process:
- Find the letters DOT on the sidewall.
- Read the characters that follow them as one continuous identification string.
- Locate the final four digits of the complete TIN.
- Separate those digits into a two-digit week and a two-digit year.
- Check the opposite sidewall if the visible DOT sequence does not end in four digits.
Some molded characters can look alike, especially when the rubber is worn or dirty. Take a close photograph, enlarge it, and compare uncertain characters with the surrounding marking. If the code remains unreadable, a Bridgestone dealer or qualified tire professional can identify it more reliably than guessing.
How to Read the Four-Digit Date Code
Since 2000, the standard date code uses four digits. The first pair represents the manufacturing week, numbered from 01 through 52 in most cases, although some production calendars can include week 53. The second pair represents the final two digits of the manufacturing year.
Examples make the format clearer:
- 0124 means the first week of 2024.
- 1821 means the 18th week of 2021.
- 4020 means the 40th week of 2020.
- 5223 means the 52nd week of 2023.
The code identifies the week in which the tire was manufactured, not the day it left the factory, the day it was shipped, or the day it was installed. A tire marked 3522 could have been produced on any day within that production week.
The year is written with two digits because the code is intended to be read with the surrounding manufacturing context. A code ending in “24” indicates 2024 in a modern tire, not 1924 or 2124. If a date code appears unusual, check the complete DOT marking and consult a tire professional rather than interpreting one isolated number.
Older Three-Digit Bridgestone Date Codes
A three-digit date code indicates that the tire was made before the current four-digit system. The first two digits represent the production week, while the final digit represents the year within a decade. For example, 237 could mean the 23rd week of a year ending in 7.
That format has an important limitation: the year’s decade is not fully identified. A three-digit code ending in 7 could refer to 1977, 1987, or 1997 unless an additional symbol provides context. Tires manufactured in the 1990s may have a triangle symbol after the three digits, but a symbol is not a dependable reason to treat an extremely old tire as safe.
Any tire with a three-digit date code is decades old or old enough to require immediate replacement, regardless of remaining tread. Do not install or continue driving on it merely because the tread looks deep. Aging can affect the rubber, internal components, and ability to withstand normal highway loads.
What the Date Code Tells You—and What It Does Not
The date code tells you the tire’s manufacturing age. It does not directly tell you how many miles the tire has traveled, how it was stored, whether it was properly inflated, or how much damage it has sustained.
A tire that was manufactured several years ago and stored correctly may have less use than a newer tire that has been overloaded, driven underinflated, exposed to severe heat, or damaged by a curb or pothole. Conversely, a tire with a recent date code can still be unsafe if it has sidewall damage, a puncture in a nonrepairable area, a bulge, exposed cords, or serious irregular wear.
Use the date as one part of a broader condition check. Examine both sidewalls and the tread for:
- Cracks, weather checking, or dry-rot-like fissures, especially between tread blocks and in the lower sidewall.
- Bulges, bubbles, cuts, punctures, or evidence of impact damage.
- Uneven wear, cupping, feathering, or wear down to the tread-wear indicators.
- Exposed cords, separation, or a tread section that appears to be lifting.
- Repeated loss of air pressure or a valve, wheel, or bead problem.
Do not rely on the date code alone to approve a tire for use. A tire’s condition, application, storage history, inflation, load, speed, alignment, and maintenance all affect its serviceability.
How Old Is Too Old for a Bridgestone Tire?
There is no single date-code number that can certify every tire as safe or unsafe in every situation. Tire age should be considered together with visible condition, use, storage, and the vehicle manufacturer’s requirements.
Bridgestone advises replacing tires at 10 years from the date of manufacture, even if they appear to have usable tread, and recommends regular professional inspections as tires age. Confirm the current guidance in the tire documentation and vehicle owner’s manual, particularly for specialty tires, trailers, commercial applications, or vehicles with unusual operating conditions.
Many tire professionals also pay closer attention once a tire reaches about five years in service or approaches that age, because rubber can deteriorate before tread is worn out. This is not a guarantee that every five-year-old tire must be discarded; it is a practical reason to schedule a careful inspection and monitor pressure, cracking, and handling.
Replace a tire sooner when it shows structural damage, severe cracking, tread separation, repeated pressure loss, or any other condition identified by a qualified technician. If a tire is several years old and its service history is unknown—such as on a used vehicle—treat the date as a risk factor rather than assuming the tire’s apparent appearance proves its safety.
Common Mistakes When Reading the Code
Reading a size number as the date
The numbers in a marking such as 215/55R17 are not a date. The first number is section width, the second is aspect ratio, “R” identifies radial construction, and the final number is wheel diameter in inches. The date is tied to the end of the DOT identification sequence.
Using a partial DOT marking
A partial code may identify the tire but omit the four-digit date. If the characters after DOT do not end in a recognizable week-and-year pair, check the opposite sidewall. This is the most important practical exception when inspecting tires mounted on a vehicle.
Assuming the sale date is the build date
A tire may sit in inventory before installation, so its manufacture date can be earlier than the purchase or installation date. The DOT date code is the reference point for age, not the date on a receipt.
Interpreting the code as an exact day
A four-digit code gives a production week, not a precise date. It cannot establish the exact day the tire was made or how long it remained in storage afterward.
Ignoring condition because the date is recent
Age is only one safety consideration. A newer tire with a sidewall bulge or exposed cord should not be used simply because its date code is recent.
When to Ask a Tire Professional for Help
Have the tire inspected if the date code is missing, damaged, incomplete, or visible only on the inner sidewall and you cannot safely access it. A technician can also check whether the tire has been mounted in the correct direction and look for damage that is difficult to see from outside.
Seek immediate professional advice before driving if you notice vibration, pulling, a sudden change in handling, repeated low pressure, a bulge, a deep cut, or a suspected tread separation. Do not attempt to determine roadworthiness from the date code while the tire has an active safety symptom.
If you are buying used tires, ask to see the complete DOT date code on every tire, not just one sample. Compare the dates, inspect for uneven wear and repairs, and be cautious when the seller cannot show the full code or explain the tire’s history.
Frequently Asked Questions About Bridgestone Tire Date Codes
Where is the date code on a Bridgestone tire?
It is the final four digits of the complete DOT identification number on the sidewall. The full sequence may face inward, so inspect the opposite sidewall if the visible DOT marking does not include four ending digits.
How do you read Bridgestone tire date code numbers?
Read the first two digits as the production week and the last two as the year. For example, 2619 means the tire was manufactured during the 26th week of 2019.
Does a Bridgestone tire have the date code on both
Not necessarily; one side may show only a partial DOT number. The complete TIN, including the date code, can be molded on only one sidewall, which may be the side facing the vehicle.
What does a three-digit Bridgestone date code mean?
A three-digit code is an older format that identifies the week and only the last digit of the year. Because the decade may be unclear, a tire with this format should be treated as too old for normal service and replaced.
Is 3522 a valid Bridgestone tire date code?
Yes, 3522 indicates the 35th week of 2022. It does not identify the exact production day, installation date, or condition of the tire.
Does the tire date code show when I bought
No, it shows when the tire was manufactured. A tire can be sold or installed weeks, months, or longer after production, so use the DOT code rather than the purchase date when considering age.
Should a Bridgestone tire be replaced after 10 years?
Bridgestone advises replacing tires at 10 years from manufacture, even when tread remains. Replace sooner for damage, severe aging signs, or unsafe wear, and follow the applicable tire and vehicle guidance.
Conclusion: Use the Full Code and Inspect the Tire
To read a Bridgestone tire date code, find the complete DOT marking and decode its final four digits as week and year. Check the opposite sidewall when the visible number is incomplete, and remember that the code gives a production week—not an exact day or a complete safety assessment.
Use the date with a careful inspection of tread, sidewalls, inflation history, and damage. If the code is unreadable, unusually old, or paired with cracking, bulging, vibration, or pressure loss, have the tire evaluated by a qualified professional and replace it when safety is uncertain.
