A 165/70R13 tire is a specific type of tire commonly used on passenger cars. The “165” indicates the tire’s width in millimeters, “70” is the aspect ratio (the height of the sidewall as a percentage of the width), “R” means it’s a radial tire, and “13” refers to the rim diameter in inches. Radial tires, like this one, have their ply cords running radially across the tire, offering better performance and fuel efficiency compared to older bias-ply designs.