What Does DOT Mean on a Tire? Load, Speed & Rating Guide
DOT on a tire means the tire carries a Department of Transportation certification mark and a Tire Identification Number, or TIN. The most useful part for you is the date code, because it tells you when the tire was made. Once you can read the DOT code, you can judge tire age, check recall information, and confirm whether the tire matches your vehicle’s size, load, and speed needs.
Quick Answer
DOT on a tire means the tire is marked as meeting applicable U.S. federal safety standards. The DOT marking sits beside the tire’s identification number. The last four digits of the modern date code show the week and year the tire was made, which helps you judge age and safety.
Key Takeaways
- The DOT symbol certifies that the tire conforms to applicable Federal Motor Vehicle Safety Standards.
- Modern new tires use a 13-symbol Tire Identification Number, or TIN, near the DOT marking.
- The last four digits of the date code show the production week and year, such as 2424 for the 24th week of 2024.
- The full TIN may not appear on both sidewalls, so check the inner side if you cannot find the date code outside.
- Tire age matters, but replacement also depends on tread depth, cracking, bulges, pressure loss, vibration, and the tire or vehicle maker’s guidance.
At a Glance
| Time Required | 2 to 5 minutes per tire |
| Difficulty | Easy |
| Tools Needed | Flashlight, clean cloth, phone camera, and tire pressure gauge |
| Cost | $0 for inspection |
What Does DOT Mean on a Tire?
The DOT marking on a tire means the tire is marked for compliance with applicable U.S. federal tire safety standards. Under 49 CFR 574.5, the DOT symbol is a certification that the marked tire conforms to an applicable Federal Motor Vehicle Safety Standard.
Right beside or near that DOT symbol, you’ll find the Tire Identification Number, often called the TIN. For modern new tires, the TIN uses 13 symbols. Those symbols identify the plant code, the manufacturer’s code, and the four-digit date code. Retreaded tires use a different TIN format, so the code may look shorter on a retread.
The date code is the part most drivers need first. It tells you when the tire was manufactured, not when it was sold or installed. That matters because rubber ages even when tread still looks good.
Note: Tires made before the current 13-symbol format may still be on vehicles or in storage. The old two-symbol plant-code format was allowed only during a phase-out period that ended April 13, 2025. Use the date code and condition, not just the code length, when judging an older tire.
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Where Is the DOT Code on a Tire?
You’ll find the DOT code molded into the sidewall. Start with the side that faces outward after the tire is mounted. If you see “DOT” but cannot find the final four date-code digits, check the other sidewall. The full TIN may appear on only one side of the tire.
Sidewall Placement
Look for a long string of letters and numbers that begins near the letters “DOT.” Wipe the sidewall clean if road dust makes the code hard to read. A phone camera can help you zoom in, especially if the tire is mounted on the vehicle.
| Marking | Meaning | What to Do |
|---|---|---|
| DOT | Federal safety certification mark | Use it to locate the TIN area |
| TIN | Tire Identification Number | Use it for age and recall checks |
| Last four digits | Production week and year | Use it to calculate tire age |
Outboard Side Location
The outboard sidewall is usually the easiest place to start because it faces you. Many tires show a DOT marking there, but the full date code may be on the inboard side. If the date code is hidden inward, use a mirror, take a phone photo from behind the wheel, or ask a tire shop to read it during service.
Dual-Sided Markings
Some tires show DOT-related markings on both sidewalls, but don’t assume both sides carry the complete TIN. If one side shows only a partial code, the full code may be on the other side. Check both sides before deciding the date code is missing.
Pro Tip: Check all four tires and the spare. Tires on the same vehicle can have different production dates, especially if one tire was replaced after a puncture or road hazard.
How to Read the DOT Tire Code
To read the DOT tire code, find the DOT marking, then look for the TIN. For a modern new tire, the TIN has three main parts: a three-symbol plant code, a six-symbol manufacturer’s code, and a four-digit date code at the end.
DOT Code Basics
A modern new tire TIN follows this basic pattern:
| TIN Part | Typical Length | What It Identifies |
|---|---|---|
| Plant code | 3 symbols | Manufacturer or retreader plant assigned by NHTSA |
| Manufacturer’s code | 6 symbols | Tire characteristics or brand-owner information |
| Date code | 4 numbers | Week and year of manufacture |
You do not need to decode every manufacturer symbol for normal ownership. For most drivers, the key job is finding the last four digits and using them to confirm the tire’s age.
Reading Date Codes
The DOT date code is the final four-digit group on modern tires. The first two digits show the production week, and the last two show the year.
- 1023 means the tire was made in the 10th week of 2023.
- 2424 means the tire was made in the 24th week of 2024.
- 0126 means the tire was made in the first full calendar week of 2026.
Use the manufacturing date, not the purchase date, when judging tire age. A tire can sit in storage before it is installed.
Pre-2000 Markings
Older pre-2000 tires used a three-digit date code. The first two digits showed the week, and the last digit showed the year within the decade. For example, 439 meant the 43rd week of 1999.
In practical terms, any tire with a pre-2000 date code is far too old for normal road use. Treat it as a display, collector, or scrap item unless a qualified tire professional gives specific non-road guidance.
What the DOT Date Code Tells You
The DOT date code tells you when the tire was made. It does not tell you tread depth, storage quality, impact damage, or whether the tire was maintained correctly. That is why the date code is one safety clue, not the whole inspection.
Still, the date code matters because rubber compounds change over time. Heat, sunlight, storage conditions, underinflation, overloading, and low mileage can all affect how a tire ages. A tire that looks fine can still be old enough to deserve a closer inspection.
NHTSA reported 511 motor vehicle traffic fatalities in tire-related crashes in 2024, which is why tire age, pressure, tread, and damage checks deserve regular attention.
Why Tire Age Matters for Safety
Tire age matters because rubber and internal tire materials can degrade over time. You cannot reliably detect tire aging just by looking at the tread. A tire can have usable tread depth and still be weakened by age, heat, sunlight, poor storage, or underinflation.
Use the DOT date code as part of a full tire check. Look for cracking, cuts, exposed cords, sidewall bubbles, vibration, repeated pressure loss, uneven wear, or tread worn down to 2/32 inch. If you see any of those signs, replace the tire or have it inspected before driving farther.
Warning: Do not keep driving on a tire with a bulge, exposed cords, deep cracking, a visible cut, repeated air loss, or sudden vibration. Those signs can point to structural damage, even if the DOT date code looks recent.
| Tire Condition | What It Means | Best Action |
|---|---|---|
| Under 6 years old | Often acceptable if tread and condition are good | Inspect monthly and keep pressure correct |
| 6 to 10 years old | Some tire and vehicle makers recommend replacement in this range | Follow manufacturer guidance and inspect closely |
| 10 years or older | Past the limit many makers use for service life | Replace unless your tire maker gives safer, specific guidance |
| Any age with damage | Age is no longer the main concern | Replace or get professional inspection immediately |
How to Read Pre-2000 DOT Codes
Pre-2000 DOT date codes used three digits instead of four. The first two digits showed the production week, and the last digit showed the year within the decade. That old format can be confusing because one digit cannot show the full year by itself.
Pre-2000 Date Format
| Old Code | Meaning | Road-Use Decision |
|---|---|---|
| 439 | 43rd week of 1999 | Do not use for normal driving |
| 215 | 21st week of 1995 | Do not use for normal driving |
| 078 | 7th week of 1998 | Do not use for normal driving |
Week and Year Code
If the first two digits appear to show an impossible week, such as 70, you are not reading the date code. Calendar week numbers on tire date codes do not work that way. Recheck the sidewall, look for the last group in the TIN, and inspect the other side of the tire if needed.
Reading 1990s Tires
If you find a three-digit tire date code from the 1990s, the answer is simple: the tire is too old for normal road service. It may still help you identify an old display tire, spare, or collector item, but it should not be treated as safe just because it holds air.
When Should You Replace Old Tires?
Replace old tires when the tire or vehicle manufacturer says they are past service life, when tread is worn to 2/32 inch, or when the tire shows damage. Age alone is important, but it is not the only rule.
- Check the DOT date code on each tire, including the spare.
- Compare the age with your vehicle owner’s manual and tire maker guidance.
- Inspect condition for cracking, cuts, bulges, uneven wear, vibration, pressure loss, or exposed cords.
- Check tread depth and replace tires worn to 2/32 inch.
- Use the tire placard on the driver’s doorjamb or owner’s manual for size and pressure guidance.
Six years is a smart point for closer attention because several tire and vehicle manufacturers recommend replacement somewhere in the six-to-10-year range, regardless of treadwear. If a tire is 10 years old or older, replacement is usually the safest decision unless the tire maker gives specific guidance for that tire and use case.
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What Tire Load Ratings Mean
The load rating tells you how much weight each tire can safely carry when properly inflated. You’ll usually see the load index after the tire size. For example, in 205/55R16 94V, the number 94 is the load index.
A load index of 94 equals 1,477 pounds, or 670 kg, per tire. That does not mean you should load the vehicle by guessing. Always match or exceed the load index listed for your vehicle, and use the tire pressure shown on the vehicle placard or in the owner’s manual.
| Load Index | Approx. Max Load Per Tire | Common Use |
|---|---|---|
| 91 | 1,356 lb / 615 kg | Many passenger cars |
| 94 | 1,477 lb / 670 kg | Cars and small crossovers |
| 102 | 1,874 lb / 850 kg | SUVs and light-duty applications |
How to Read Tire Speed Ratings
The speed rating is a letter that shows the maximum speed the tire is designed to sustain under proper load, inflation, and test conditions. It is not permission to drive that fast. It is a performance and heat-resistance rating.
In 205/55R16 94V, the letter V is the speed rating. When replacing tires, match or exceed the speed rating recommended by your vehicle maker unless a tire professional confirms a safe exception for your use.
| Speed Rating | Maximum Speed | Typical Meaning |
|---|---|---|
| T | 118 mph | Touring and everyday tires |
| H | 130 mph | Many sedans and crossovers |
| V | 149 mph | Performance-oriented tires |
| W | 168 mph | Higher-performance tires |
| Y | 186 mph | High-performance tires |
Other Tire Sidewall Markings to Know
The DOT code is only one part of the sidewall. You should also read the tire size, load index, speed rating, season markings, and extra-load markings before buying or installing a tire.
| Marking | Meaning | Why It Matters |
|---|---|---|
| 205/55R16 | Width, aspect ratio, construction, and wheel size | Confirms fitment |
| 94 | Load index | Confirms weight capacity |
| V | Speed rating | Confirms performance rating |
| M+S | Mud and snow marking | Not the same as severe winter certification |
| 3PMSF | Three-Peak Mountain Snowflake | Indicates severe snow service rating |
| XL | Extra Load | Higher load capacity at specified pressure |
| UTQG | Treadwear, traction, and temperature grading | Helps compare passenger tire characteristics |
The maximum pressure molded on the tire sidewall is not the same as your vehicle’s recommended tire pressure. For normal use, follow the tire pressure on the driver’s door placard or owner’s manual.
Common DOT Code Mistakes
DOT codes are easy to read once you know where to look, but several markings can confuse people.
- Reading colored dots as date codes: Yellow or red dots are usually mounting or balance marks, not the tire’s age.
- Stopping at the first DOT marking: If the final four digits are missing, check the other sidewall.
- Using purchase date as tire age: Tire age starts from the manufacturing date, not the day you bought the tire.
- Ignoring the spare: Spare tires age too, even when they are rarely used.
- Mixing load or speed ratings: Use tires that match or exceed your vehicle’s required load index and speed rating.
- Assuming DOT means new: DOT means compliance marking, not freshness. Always read the date code.
Frequently Asked Questions
How do you read a DOT tire date code?
Read the last four digits of the modern DOT date code. The first two digits show the production week, and the last two digits show the production year. For example, 1023 means the tire was made in the 10th week of 2023.
How long do DOT tires last?
There is no single lifespan that fits every tire. Some tire and vehicle manufacturers recommend replacement somewhere between six and 10 years, regardless of treadwear. Replace sooner if the tire is cracked, bulged, worn to 2/32 inch, losing pressure, vibrating, or damaged.
Does DOT on a tire matter?
Yes. The DOT marking shows federal safety-standard certification, and the TIN helps identify the tire’s plant, manufacturing code, and production date. It can also help when checking tire recalls.
What if my tires only have three numbers after DOT?
A three-digit date code usually points to a pre-2000 tire. The first two digits show the week, and the last digit shows the year within the decade. Any tire with that old format is too old for normal road use.
Is the DOT date the same as the installation date?
No. The DOT date code shows when the tire was manufactured. A tire may sit in a warehouse or shop before installation, so tire age starts before the day it goes on your vehicle.
Can I drive if the DOT code is missing or unreadable?
If you cannot read the full DOT/TIN, check the other sidewall first. If the tire is damaged, old, heavily weathered, or the code is still unreadable, have a tire professional inspect it before relying on it for regular driving.
Conclusion
The DOT marking is more than a sidewall stamp. It points you to the tire’s identification number, date code, and safety-compliance information. Read the last four date-code digits to find the production week and year, then check the tire’s age, tread, condition, load index, speed rating, and fitment against your vehicle’s requirements. If the tire is old, damaged, worn, or mismatched, replace it before it puts your safety at risk.
Sources
- NHTSA TireWise — tire aging, tread depth, tire pressure, maintenance, and tire safety guidance
- 49 CFR 574.5 Tire Identification Requirements — DOT symbol, TIN format, plant code, manufacturer code, and date-code requirements
- NHTSA Recalls Lookup — tire recall and safety investigation search
- NHTSA Ratings — Uniform Tire Quality Grading System reference for comparing tire features
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