How to Identify Tire Size?
2 Answers
Tire size identification method: You can check the data on the sidewall of the tire. Tire size is a fundamental parameter when purchasing tires, and it is recommended to directly choose replacement tires with the same size data as the original factory specifications. Original factory sizes are models that have been designed and verified by the manufacturer to match the vehicle's powertrain. Tire specifications are commonly represented by a set of numbers, where the first number indicates the tire section width, and the latter denotes the rim diameter, measured in inches. Taking 165/70R14 as an example, it represents a radial tire with a tread width of 165 millimeters, an aspect ratio of 70, and a rim diameter of 14 inches. Some tires may also include other letters or symbols with special meanings: "X" denotes high-pressure tires; "C" indicates reinforced tires; "B" stands for bias-ply tires; and "-" represents low-pressure tires.
I've been looking at tire sizes for years because, with my driving experience, I know it's all about safety. There's a string of numbers engraved on the side of the tire, like P215/65R15, which needs to be broken down: P stands for passenger car tire, 215 is the width in millimeters, 65 is the aspect ratio (height as a percentage of width), R indicates radial construction, and 15 is the rim size in inches. This affects driving stability—for example, a tire that's too narrow has weak grip and is prone to skidding in the rain. I check my tires every six months, also taking a look at tread wear. When replacing tires, it's important to match the original factory specifications, or else fuel consumption may increase or handling may worsen. For safety, don't overlook the load index and speed rating, like the 95H at the end—95 is the load capacity, and H is the maximum speed rating. These details are hidden in the owner's manual; flipping through it now and then can increase your knowledge.
