The marking "89H" on a tire is part of the tire’s size and load index information, and it provides two key details: the load index and the speed rating of the tire.
Load Index (89): The number "89" represents the tire’s load index. This index indicates the maximum load a tire can carry at its maximum inflation pressure. For a load index of 89, the tire can carry a maximum load of 1,279 pounds (580 kg) per tire. This figure is established by testing and is standardized by the tire industry.
- Speed Rating (H): The letter "H" denotes the tire’s speed rating, which indicates the maximum speed the tire can safely sustain under optimal conditions. An "H" speed rating corresponds to a maximum speed of 130 mph (210 km/h).
Together, the "89H" marking provides essential information for ensuring that tires are suitable for a vehicle’s load requirements and intended speed capabilities, which are critical for safety and performance. When replacing tires, it’s important to match or exceed the original load index and speed rating recommended by the vehicle manufacturer.