The “105W” marking on a tire refers to two important specifications: the tire’s load index and speed rating.
Load Index (105): The number “105” indicates the tire’s load index, which is a numerical code that corresponds to the maximum weight the tire can safely carry when properly inflated. A load index of 105 means that the tire can support a maximum load of 2,039 pounds (925 kg) per tire. This load capacity is essential for ensuring the vehicle operates safely under the weight it carries.
Speed Rating (W): The letter “W” represents the tire’s speed rating, which indicates the maximum speed at which the tire can perform safely. A “W” speed rating means the tire is rated for speeds up to 168 mph (270 km/h). This is important for ensuring that the tire can handle the dynamic forces at high speeds without compromising safety.
In summary, “105W” on a tire indicates that it can carry a maximum load of 2,039 pounds and is rated for speeds up to 168 mph, making it suitable for high-performance vehicles that require both load capacity and speed capability. Always ensure to check the vehicle manufacturer’s recommendations for tire specifications to ensure safety and performance.