1. 300-18: This indicates the tire's size.

   • 300: This is the width of the tire in millimeters.
   • 18: This denotes the diameter of the wheel rim in inches for which the tire is designed.

2. M6301: This is likely a model or series designation assigned by the manufacturer. "M6301" refers to the specific model of the tire.

In summary, the "300-18 M6301" tire is a motorcycle tire with a width of 300 millimeters and designed for a wheel rim with an 18-inch diameter.