On the sidewall of the tire is a series of numbers and letters that the manufacturer designates the technical data of the tires. In the designation, the width is indicated in millimeters - this is the width with which the tire touches the road. The second digit after the slash indicates the ratio of the height and width of the tire and is given as a percentage. The lower the ratio, the lower profile tires. Letter «R» used to designate radial tires, the number behind the letter indicates the diameter of the wheel (is the same for all considered models).