What does 100y mean on car tires?
2 Answers
Car tire 100y refers to the tire's load index and speed rating. Here, 100 indicates the load index, meaning the tire can bear a maximum weight of 800kg under normal inflation conditions, while y represents the speed rating, indicating the tire's maximum speed capacity of 300km/h when carrying the specified load under defined conditions. The functions of car tires include: 1. Supporting the vehicle's entire weight and bearing the car's load; 2. Transmitting traction and braking torque to ensure good adhesion between the wheels and the road surface; 3. Working with the car's suspension to mitigate impacts during driving and dampen resulting vibrations; 4. Protecting automotive components from severe vibrations and premature damage.
As someone who has been repairing cars for many years, I often encounter the meaning of tire markings like 100y: here, 100 is the load index, representing a maximum load capacity of 800 kilograms, and y is the speed rating, indicating a maximum safe speed of 300 kilometers per hour. Understanding these is crucial because mismatches can lead to safety hazards, such as overloading which can cause tire blowouts or loss of control. In daily maintenance, I would recommend car owners to check their vehicle manuals for the correct specifications and models, not just focusing on price while ignoring parameters. For SUVs or heavy-load vehicles, the load index is especially important, while high-speed drivers should pay more attention to the speed rating. Regular checks of tire wear and pressure are also essential, as they can extend tire life and ensure driving safety.
