How to Understand the Numbers on your Tire. ... It does not indicate the tire is designed for all winter conditions. Severe Service Emblem. If you see an icon of a snowflake inside a mountain, it means you’re riding on some pretty safe tires, equipped for winter conditions consistently below 7° Celsius.
For those of you who wonder what do tire sizes mean, you can check the numbers that are written on the sidewall of the tire. Three digits number that follow the first letter usually represent the width of the tire in millimeters. The two digits numbers that follow after the width of the tire usually represent the aspect ratio of the tire.