A tire load index is the coded number that shows the maximum weight one tire can carry at its rated pressure.
If you’ve ever looked at a tire sidewall and felt lost, you’re not alone. One small code many drivers miss is the load index. It tells you what the tire is built to carry.
That matters when you replace tires, load up for a trip, or compare one tire model with another. Pick too little carrying capacity and you can end up with a weaker match than your car, SUV, or pickup was built for.
Why The Load Index Number Matters
The load index is a numerical code tied to a maximum load value for one tire. The bigger the number, the more weight that tire is rated to carry when it is inflated correctly. It is part of the tire’s technical spec.
Drivers often spot the tire size and skip the rest. Two tires can share the same size and still have different load indexes. If you only match size, you may miss a rating your vehicle calls for.
- A higher load index means the tire can carry more weight.
- A lower load index means less carrying capacity.
- The right match should meet or exceed your vehicle’s required rating.
- The number works with proper inflation, not by itself.
Think of it as a limit code. It does not tell you how much your whole vehicle can carry by itself. The full vehicle picture comes from the placard on the driver’s door jamb and the owner’s manual.
Tire Load Index Meaning On Real Sidewall Codes
You’ll usually find the load index near the end of the tire size string, right before the speed rating letter. A common sidewall marking might read P225/65R17 102H. In that code, 102 is the load index and H is the speed rating.
Where You’ll Find It
Start with the long row of letters and numbers on the sidewall. Find the tire size, then look right after it. The number is the load index. The letter after it is the speed symbol.
What The Number Is Telling You
That number does not equal pounds or kilograms by itself. It points to a chart value. So a load index of 91 does not mean 91 pounds. It means the tire is rated for 1,356 pounds. A 102 does not mean 102 kilograms. It means 1,874 pounds.
Once you know that, sidewall codes stop feeling random. You can read them like a label instead of a puzzle.
How To Read A Common Tire Code
Take this sample code: P225/65R17 102H. Here’s what each part means:
- P = passenger tire
- 225 = tire width in millimeters
- 65 = aspect ratio
- R = radial construction
- 17 = wheel diameter in inches
- 102 = load index
- H = speed rating
That one small number near the end is the part many drivers miss. A family crossover that came with a 102-rated tire should not be downgraded to a lower number just because the size looks the same on the shelf.
| Load Index | Max Load Per Tire | Common Use Range |
|---|---|---|
| 84 | 1,102 lb / 500 kg | Small passenger cars |
| 88 | 1,235 lb / 560 kg | Compact sedans |
| 91 | 1,356 lb / 615 kg | Small cars and hatchbacks |
| 94 | 1,477 lb / 670 kg | Midsize sedans |
| 97 | 1,609 lb / 730 kg | Midsize crossovers |
| 100 | 1,764 lb / 800 kg | Heavier sedans and small SUVs |
| 102 | 1,874 lb / 850 kg | Crossovers and many SUVs |
| 105 | 2,039 lb / 925 kg | SUVs, vans, and light trucks |
What Is Tire Load Index Mean On A New Tire?
When you shop for replacement tires, the load index is one of the numbers you should match before you compare tread life, ride feel, or price. If the new tire meets the size but falls short on load rating, it is not a like-for-like replacement.
Michelin’s tire markings page shows where load and speed ratings sit in the sidewall code. That layout is handy when you’re staring at a tire listing online or checking the sidewall in a parking lot.
Why Matching The Number Matters
Your vehicle maker picked a tire rating that fits the car’s weight and intended load. Drop below that number and the tire may have less margin when the car is full of passengers, cargo, or both. It means the tire is carrying a job it was not rated for.
Going higher is often allowed when the size, speed rating, and other specs still fit the vehicle, but you still need to check the placard and manual. Some higher-load tires have stiffer sidewalls.
What Load Index Does Not Tell You
This part trips people up. The load index is not the same thing as payload, axle rating, or towing rating. It is one piece of the puzzle.
- It does not replace the vehicle’s door placard.
- It does not tell you the best tire pressure for daily driving.
- It does not tell you tread life or grip.
- It does not overrule the wheel’s own load limit.
NHTSA’s TireWise tire safety page points drivers back to two things that matter every day: proper inflation and staying within the vehicle’s load limit. That’s why adding up four tire ratings is not the same as your safe payload number. Weight is not always spread evenly, and the vehicle itself sets limits too.
Say each tire is rated to carry 1,874 pounds. Four of them add up to 7,496 pounds. That still does not mean your vehicle can carry that much people and cargo. The curb weight, axle balance, wheel ratings, and placard limits still rule the real answer.
| Check Item | Where To Find It | Why It Matters |
|---|---|---|
| Load index | Tire sidewall and tire listing | Shows how much weight one tire is rated to carry |
| Recommended tire size | Door placard and owner’s manual | Keeps replacements matched to the vehicle |
| Recommended pressure | Door placard | Load rating depends on proper inflation |
| Speed rating | After the load index on the sidewall | Must fit the vehicle’s tire spec |
| XL or HL marking | Sidewall near the size code | Shows a higher-load tire type in some fitments |
How To Choose The Right Load Index When Replacing Tires
You do not need a spreadsheet for this. A short check is usually enough.
- Read the tire size and load index on your current tire.
- Check the driver-door placard for the vehicle’s required tire size and pressure.
- Make sure the replacement tire meets or exceeds the original load index.
- Match the speed rating and service type unless your vehicle maker allows another spec.
If your car came with extra-load or high-load tires, pay close attention. EVs, larger crossovers, and some vans can use tires with higher carrying capacity than you might expect from the size alone.
Common Mistakes That Trip Drivers Up
A lot of mix-ups happen because the numbers look close enough. Tire specs do not work that way. One-step changes can matter.
- Matching size but missing the load index
- Using the sidewall pressure instead of the door-placard pressure
- Assuming a higher speed rating fixes a lower load rating
- Adding four tire ratings and calling that the payload number
Treat the placard as the baseline and the sidewall as the confirmation. When both line up, you are on solid ground.
One Easy Way To Remember It
Read the load index as the tire’s carrying code. Size tells you whether the tire fits the wheel. The load index tells you how much weight that tire is built to carry. The speed rating tells you the speed class.
In plain English, it means the weight limit code for one tire, not the whole vehicle. Once you know where to find it and how to match it, you can shop smarter and avoid a bad downgrade.
References & Sources
- Michelin.“How to Read Tire Markings and Sidewall Codes.”Shows where load and speed ratings appear in the tire sidewall code.
- National Highway Traffic Safety Administration.“Tire Safety Ratings and Awareness | TireWise.”Explains tire safety basics, including inflation and staying within vehicle load limits.