What Do the Tire Data Represent?
2 Answers
Tire data indicates the tire section width, aspect ratio, wheel diameter in inches, and tire load index. Example of tire data: For instance, in a 215/55R19 91W tire, 215 represents the tire section width, 55 is the aspect ratio, R stands for radial construction, 19 is the wheel diameter in inches, 91 is the tire load index, and W indicates the maximum speed under load is 270 km/h. Tire profile dimensions: Larger tire profile dimensions are not necessarily better. While a wider tire tread enhances grip, it also leads to higher fuel consumption, noticeable tire noise, and can affect passenger comfort.
With my extensive driving experience, I'm very familiar with tire specifications. The markings like 225/65R17 on tires have specific meanings: 225 indicates the tire's width in millimeters (225mm), representing the tread width; 65 is the aspect ratio (65%), meaning the tire's height is 65% of its width; R stands for radial construction, which is the mainstream design; and 17 denotes the wheel diameter in inches (17 inches). There's also another set of numbers like 98H, where 98 is the load index (approximately 750 kg maximum load capacity - never overload as it significantly increases the risk of tire blowouts), and H is the speed rating (maximum safe speed of 210 km/h). Understanding these key specifications helps ensure safer driving. A higher aspect ratio like 65% provides better comfort and shock absorption but reduces handling performance. A low load index can cause issues when the vehicle is heavily loaded, and exceeding the speed rating accelerates tire wear. Always check the manufacturing date, typically found as the last four digits after DOT on the tire sidewall (e.g., 4523 means the 45th week of 2023). Tires should be replaced after 5-6 years due to aging. Regularly check tire pressure according to the standards on the vehicle's door label. These details directly impact driving safety and fuel efficiency. I've developed a habit of checking them every time I wash my car.
