What does "156/150" refer to in the following tyre designation: 315/80 R 22.5 156/150 L?

In the tire designation "315/80 R 22.5 156/150 L," the "156/150" refers to the load index for single and twin tires.

The load index indicates the maximum load each tire can support at the specified pressure. The first number (156) applies to a single tire fitted to the axle, while the second number (150) indicates the load capacity for a twin tire setup, which is commonly used in heavy vehicles.

Understanding this load index is crucial for safe vehicle operation, as it helps ensure that tires can support the vehicle's weight without risking tire failure, particularly under heavy loads, which is important in compliance with German traffic regulations. By correctly interpreting tire specifications, drivers can make informed decisions about tire suitability and safety for their vehicles.