On every truck tire, besides information like brand, size, and production year, you’ll see symbols like 91W, 121L. These are the load index and speed rating. So, what do these symbols mean? Let’s explore the details of the truck tire load index chart with Xe Tải Mỹ Đình.
What is the Load Index of a Truck Tire?
The Load Index indicates the maximum weight a tire can carry at a specific speed (determined by the speed rating) under standard operating conditions set by the manufacturer. A higher index means the tire can bear a heavier load. Therefore, tires for trucks and commercial vehicles usually have a higher load index compared to passenger car tires.
Truck Tire Load Index to Load Capacity (kg) Conversion Chart
| Load Index | Kg | Load Index | Kg | Load Index | Kg |
|---|---|---|---|---|---|
| 51 | 195 | 81 | 462 | 111 | 1090 |
| 52 | 200 | 82 | 475 | 112 | 1120 |
| … | … | … | … | … | … |
| 149 | 3250 | 179 | 7750 | 209 | 18500 |
| 150 | 3350 | 180 | 8000 | 210 | 19000 |
| … | … | … | … | … | … |
| 249 | 58000 |
(Full chart provided in the original article) Consulting the truck tire load index chart will help you choose the right tires for your vehicle.
What is the Speed Rating of a Truck Tire?
The Speed Rating indicates the maximum speed at which a tire can carry a certain weight (determined by the load index) under standard operating conditions. This rating is represented by a letter, corresponding to a specific speed, increasing from A to Z (from 5 km/h to over 300 km/h).
Speed Rating to Speed (km/h) Conversion Chart
| Speed Rating | Km/h | Speed Rating | Km/h |
|---|---|---|---|
| L | 120 | U | 200 |
| M | 130 | H | 210 |
| … | … | … | … |
| Y | 300 | (Y) | 300+ |
(Full chart provided in the original article)
Significance of Truck Tire Load Index Chart and Speed Rating
The truck tire load index chart and speed rating are crucial for vehicle operation. These parameters are measured when the tire is in good condition, properly inflated, and mounted on the correct rim size. When replacing tires, ensure both the size and these two indices match the vehicle registration certificate to ensure safety and insurance coverage.
For example, the Michelin 215/45R17 Primacy 4 tire has the symbol 91W, meaning a load index of 91 (615kg) and a speed rating of W (270km/h). Exceeding the maximum load or speed limits can affect vehicle performance and safety.
Conclusion
Understanding the truck tire load index chart and speed rating helps you choose and use tires correctly, ensuring safe and efficient operation. Always follow manufacturer recommendations and refer to the truck tire load index chart to ensure safety for yourself and others around you. Contact Xe Tải Mỹ Đình for more detailed advice on choosing the right truck tires.
