What are the specification parameters of car tires?
3 Answers
Car tire parameters include: production date, tire specifications. Taking the 185/60r17 89h model tire as an example, the tire parameters represent: 1. 185 indicates the tire width is 185mm; 2. 60 indicates the aspect ratio of the tire section is 60%; 3. r indicates the tire has a radial structure; 4. 17 indicates the rim diameter is 17 inches; 5. 89 indicates the load index; 6. h indicates the speed rating. Car tires are one of the important components of a vehicle, directly contacting the road surface and working with the car suspension to cushion the impact during driving, ensuring good ride comfort and smooth driving performance, maintaining good adhesion between the wheels and the road surface, improving the vehicle's traction, braking, and passing ability, and bearing the weight of the car.
I always pay close attention to my car tires, especially the specifications, as they are crucial for safety and driving experience. The numbers on the tire, like 215/60R16 98H, have specific meanings: 215 is the width in millimeters, indicating how wide the tire's contact surface is, which affects grip; 60 is the aspect ratio, a percentage showing the height relative to the width—higher ratios mean softer tires, better for uneven city roads; R stands for radial construction, known for durability; 16 is the rim diameter in inches, which must match the wheel size for proper fitting; 98 is the load index, meaning each tire can carry about 650 kg to ensure safety by avoiding overload; H is the speed rating, allowing up to 210 km/h, suitable for highways. I’ve also noticed the recommended tire pressure values on the door frame, which affect fuel efficiency and lifespan. I check the tire pressure monthly with a gauge to prevent unexpected blowouts, especially before long trips. I always remind myself to adjust for seasonal changes, like not overinflating tires in summer.
As someone who has been doing repairs by cars for years, I understand that tire parameters are not just about the surface—you need to dig deeper into performance. For example, width: a narrow tire like 185mm saves fuel, while a wide one like 245mm offers better handling but more noise. Aspect ratio, say 55%: a lower ratio improves cornering stability but reduces comfort due to poor shock absorption. Wheel diameter: 15 inches or above is common, as car manufacturers set it to match the suspension system. Speed rating: V means 240km/h, suitable for racing, while T at 190km/h is enough for daily use—don’t exceed limits or you’ll burn the tires. Load index: 90 corresponds to 600kg—check the manual to avoid overloading, as overlooking this can damage the suspension and braking systems. I emphasize that these parameters are critical for driving safety. Regular tire rotation extends lifespan, and always verify OEM specs when replacing tires—don’t cut corners to save money or effort, or you’ll face longer braking distances and increased risk of skidding in the rain.
