What is the purpose of the direction indicator arrow molded onto the sidewall of modern motorcycle tires?

1. It shows the correct rotation direction of the tire when moving forward, which is critical for proper water evacuation and tread stability.
2. It points toward the front of the motorcycle to assist in mounting the wheel assembly.
3. It indicates where the tire valve stem should line up during mounting.
4. It shows the direction the tire should be stored when stacked on warehouse shelves.