Tire sizes are typically expressed in a series of numbers and letters that indicate the tire's dimensions and specifications. For example, a tire labeled as P215/65R15 means it has a width of 215 millimeters, an aspect ratio of 65% (height to width), and fits a 15-inch rim. The "P" indicates it's a passenger tire, while "R" signifies radial construction. Understanding tire sizes is essential for vehicle safety and performance. Choosing the correct size ensures proper fitment, handling, and fuel efficiency. Additionally, using the right tire size can enhance traction and stability, contributing to a smoother driving experience.