The tire load index is an assigned number that corresponds to the maximum weight that a tire can support when properly inflated. This number is a crucial piece of information found on your tire's sidewall.
Understanding Tire Load Index
The load index indicates the maximum carrying capacity of a single tire at the speed specified by its corresponding speed rating under recommended inflation pressure. As the reference states, the higher the tire's load index number, the greater its load carrying capacity.
This assigned number doesn't directly represent a weight unit like pounds or kilograms. Instead, it's a numerical code that corresponds to a specific weight capacity listed in a standardized chart. For example, a tire with a load index of 91 can support a different maximum weight than a tire with a load index of 100.
- Higher Number = Higher Capacity: A tire with a load index of 100 can carry more weight than a tire with a load index of 95.
- Safety Standard: Choosing a tire with the correct or higher load index than your vehicle's recommendation is vital for safety and performance.
Why is Tire Load Index Important?
Knowing and adhering to the correct load index for your vehicle is essential for several reasons:
- Safety: Using tires with an insufficient load index can lead to tire failure, especially when the vehicle is loaded to its maximum capacity. This can result in loss of control and accidents.
- Tire Lifespan: Overloading tires can cause excessive heat buildup, rapid wear, and structural damage, significantly reducing their lifespan.
- Vehicle Performance: Tires operating within their load limits provide better handling, braking, and overall stability.
Finding Your Tire Load Index
You can typically find the tire load index in a few places:
- Tire Sidewall: Look for a series of numbers and letters (e.g.,
205/55R16 91V). In this example,91is the load index. - Vehicle Doorjamb Sticker: This sticker, usually found on the driver's side door frame, provides the recommended tire size, load index, and speed rating for your specific vehicle.
Examples of Load Index and Capacity
Here is a simplified table showing how load index numbers correspond to maximum weight capacity per tire:
| Load Index | Max Load (kg) | Max Load (lbs) |
|---|---|---|
| 85 | 515 | 1135 |
| 90 | 600 | 1323 |
| 95 | 690 | 1521 |
| 100 | 800 | 1764 |
| 105 | 925 | 2039 |
Note: This is a partial list. Comprehensive charts are available from tire manufacturers and industry standards organizations.
When replacing tires, it's crucial to match or exceed the load index specified by your vehicle's manufacturer to ensure the tires can safely support the vehicle's weight.
