Tire size refers to the dimensions of a tire, which are crucial for vehicle performance and safety. It is typically expressed in a series of numbers and letters, such as 205/55R16. The first number indicates the tire's width in millimeters, the second number represents the aspect ratio (the height of the sidewall as a percentage of the width), and the letter denotes the tire's construction type, with "R" indicating radial construction. The final number is the diameter of the wheel in inches. Choosing the correct tire size is essential for maintaining proper handling, fuel efficiency, and ride comfort. Using the wrong size can lead to issues like poor traction, uneven wear, and even damage to the vehicle's suspension. Vehicle manufacturers usually provide recommended tire sizes in the owner's manual or on a sticker located on the driver's side door jamb, ensuring that drivers can select the appropriate tires for their vehicle.