What Do the Markings on Tires Represent?
3 Answers
The meanings represented by tire markings: For example, 215/60R17 102V, where 215 indicates the tire width is 215 millimeters; 60 represents the aspect ratio of the tire; R stands for radial tire; 17 denotes the rim diameter is 17 inches; 102 is the load index; and V signifies the speed rating of 240 kilometers per hour. Automobile tires are one of the crucial components of a vehicle, directly contacting the road surface. Together with the car suspension, they help mitigate the shocks encountered during driving, ensuring excellent ride comfort and smooth driving performance, as well as maintaining good traction between the wheels and the road surface.
See that string of numbers and letters on the tire? As a long-distance driver, I always study these markings carefully when changing tires. Take something like 215/65R15 for example: 215 is the tire width in millimeters, 65 represents the aspect ratio percentage, R indicates radial construction, and 15 is the wheel diameter in inches. For combinations like 95H, 95 is the load index (capable of carrying about 690 kg max), while H is the speed rating (up to 210 km/h). There's also the DOT code, such as 3120, meaning the tire was manufactured in the 31st week of 2020 – older tires wear faster and should be replaced. Snow tires marked with M+S are suitable for mud and snow conditions, ideal for winter use. Don't overlook the UTQG rating either, like A B 400, which stands for traction, temperature resistance, and treadwear index – higher numbers mean better durability. When choosing tires, don't just go for the cheapest option; these markings all relate to driving safety and fuel efficiency. It's recommended to check the wear indicators every six months to prevent blowouts.
Having worked in the workshop for over a decade, customers often ask me about the significance of tire markings. Simply put, the size like P205/55R16: P stands for passenger vehicle, 205 is the width, 55 is the aspect ratio affecting cornering grip, and 16 is the rim size. Load and speed ratings like 92V: V allows a maximum speed of 240km/h, 92 supports 630kg—don't overload to avoid blowouts. The DOT manufacturing date, such as 1718, means the tire was produced in the 17th week of 2018; replace it after six years. Seasonal markings like M+S indicate standard snow tires, while the snowflake symbol is better. A high UTQG treadwear index like 500 means longer durability. Key points: If you often drive on rough roads, check for reinforced sidewall markings; if the markings are worn, use a magnifier to inspect them—don't ignore this, or you might skid in the rain and cause an accident.
