Key Takeaways
- The load index appears as a two- or three-digit number on the tire sidewall, always paired with a speed rating letter.
- Each load index number corresponds to a specific weight capacity that you can look up on a standardized chart — index 95 means roughly 1,521 pounds per tire, but the exact figure depends on the chart source.
- Your vehicle's door jamb or owner manual lists the recommended load index for your car, truck, or SUV, and your replacement tires must meet or exceed that number.
- Load index and speed rating work together — you cannot choose one without checking the other, because they appear as a pair on every tire.
Where to Find the Load Index on Your Tire
The load index sits on the sidewall of the tire itself, printed as part of the tire size code. It appears near the end of that code, right before or after a single letter that represents the tire's speed rating. For example, in the code "P225/65R17 95H", the 95 is the load index and the H is the speed rating.
If you cannot read the sidewall clearly — dirt, wear, or angle makes it hard to see — check your vehicle's door jamb label. Open the driver's side door and look at the frame where the door closes; you will see a sticker or placard listing the tire size and load index your manufacturer recommends. Your owner manual also contains this information in the tire specifications section, usually near the front or in an appendix.
How Load Index Numbers Map to Weight Capacity
Load index numbers follow a standardized scale, but the weight each number represents varies slightly depending which chart you consult — the Tire and Rim Association publishes one widely used version, and tire manufacturers sometimes use slightly different tables. Rather than memorize the scale, use a lookup chart when you need the exact weight.
As a general reference: index 75 represents roughly 1,320 pounds, index 85 roughly 1,760 pounds, index 95 roughly 1,521 pounds, and index 105 roughly 2,039 pounds. These figures shift by 10 to 20 pounds depending on the source, so always verify with the specific chart that came with your tire or vehicle documentation. The important principle is that each step up in the index number increases the weight capacity, and you should never use a tire with a lower index than your vehicle requires.
Understanding Load Index Paired with Speed Rating
The load index and speed rating always appear together on the tire sidewall, and you must satisfy both requirements when you buy replacement tires. The speed rating is the letter that follows the load index — H, V, W, Y, and so on — and it tells you the maximum speed the tire is rated to handle safely. A tire rated 95H means it can carry the weight corresponding to index 95 and maintain that capacity at speeds up to 130 mph.
You cannot choose a tire based on load index alone and ignore the speed rating, because the two ratings work as a pair. If your vehicle's door jamb says "95H", you need a tire that is at least 95H — you could use 95V or 95W (higher speed ratings), but not 95G or 95T (lower speed ratings). Mixing ratings across your four tires is not recommended; buy a matching set whenever possible.
Finding Your Vehicle's Required Load Index
Your vehicle manufacturer specifies the minimum load index your tires must have, and this number appears in three places: the driver's side door jamb, your owner manual, and sometimes on a sticker inside the fuel door. The door jamb label is usually the fastest place to check — it lists the tire size, load index, and speed rating all in one line.
If you have lost your manual or cannot read the door jamb clearly, contact your vehicle's manufacturer with your vehicle identification number (VIN), or visit a tire shop and ask them to look it up in their database. Do not guess or assume your current tires are correct; a previous owner may have installed the wrong size, and you need to know what your vehicle actually requires.
What Happens When You Use the Wrong Load Index
Using a tire with a load index lower than your vehicle requires puts you at risk of tire failure. An underrated tire flexes more than it should under your vehicle's weight, which generates excess heat inside the tire. Over time or under heavy load — carrying passengers and cargo, towing, or highway driving — that heat can cause the tire to separate, blowout, or lose pressure suddenly.
Using a tire with a higher load index than required is safe and actually common; many people buy tires rated higher than the minimum because they plan to carry heavy loads or tow. The downside is that stiffer tires (which is what higher load indexes often mean) may ride slightly harder and wear differently than the original equipment. As long as the speed rating also matches or exceeds your vehicle's requirement, a higher load index is not a problem.
Reading a Load Index Conversion Chart
A load index chart lists numbers from 0 to 150 in the left column and the corresponding weight capacity in the right column, usually in both pounds and kilograms. To use it, find your tire's load index number on the left and read across to see the weight capacity on the right. Most charts show the weight per tire, not total vehicle capacity — so if your chart says index 95 equals 1,521 pounds, that is what one tire can carry, not all four.
Charts vary slightly between sources because tire standards have evolved and different organizations round differently. The Tire and Rim Association chart and the European tire standard (ETRTO) chart are the two most common, and they may differ by 10 to 30 pounds for the same index number. When in doubt, use the chart that came with your tire or vehicle documentation, or ask your tire retailer which standard they use.
Common Mistakes When Checking Load Index
The most common error is confusing load index with tire size. The size code (like 225/65R17) tells you the tire's width, aspect ratio, and wheel diameter, but it does not tell you the weight capacity — you need the index number that follows. Some people also mix up load index with load range, which is an older rating system using letters (A, B, C, D, E) that you see on truck and trailer tires. Load range and load index are not interchangeable; check which system your tire uses.
Another mistake is assuming all tires of the same size have the same load index. Two tires both labeled 225/65R17 might have different index numbers — one could be 95 and another 105 — because the internal construction differs. Always check the specific tire's sidewall or specification sheet, not just the size.
Frequently Asked Questions
Can I use a tire with a higher load index than my vehicle requires?
Yes. A higher load index means the tire can carry more weight, so it is safe to use on a vehicle that requires a lower index. You may notice a slightly stiffer ride because higher-capacity tires are often built with stiffer sidewalls, but there is no safety risk as long as the speed rating also meets your vehicle's requirement.
What if I cannot find the load index on my tire?
Check the sidewall again in better light, or look at your vehicle's door jamb label and owner manual instead. If the tire is very worn or damaged, the sidewall may be illegible — in that case, contact the tire manufacturer with the tire size, or visit a tire shop and ask them to identify it. Do not drive on a tire whose specifications you cannot verify.
Does load index change as the tire wears?
No. The load index printed on the tire sidewall is permanent and does not change as the tire wears down. However, a worn tire may not perform as safely as a new one, so you should replace tires when the tread depth reaches 4/32 of an inch, regardless of what the load index says.
Is load index the same as weight rating?
Load index is a number that corresponds to a weight rating. The index itself (like 95) is not a weight — it is a code you look up on a chart to find the actual weight capacity in pounds or kilograms. Different charts may show slightly different weights for the same index, so always use the chart that matches your tire or vehicle documentation.
What if my vehicle's door jamb lists two different load indexes?
Some vehicles list different indexes for front and rear tires, or different indexes depending on whether you are carrying a light or heavy load. Read the label carefully — it may say something like "front 94, rear 95" or show different recommendations for different configurations. Use the index specified for your vehicle's actual setup, and buy tires that meet the higher of the two numbers if you want a single set that works in all configurations.