The Haida Racing HD921 is a performance and high performance, summer tire manufactured for passenger cars and SUVs. This model from Haida Tires comes in rim sizes that range from 14 all the way up to 24 inches. They offer a huge list of sizes and various tire characteristics to satisfy the needs of as many sports car drivers as possible.

There is some diversity in the speed rating as well, some sizes being Y (300 kmh or 186 mph) and H (210 mph or 130 kmh), while the vast majority of them are W (270 mph or 168 kmh) and V (240 mph or 149 kmh). These are safe limits, meaning you can drive at these exact speeds without pushing the tire’s limits too much.

The load index for this model varies between 78 (937 lbs or 425 kgs) and 117 (2833 lbs or 1285 kgs). This ensures that the model is suitable for heavier SUVs and lighter sports cars as well. You can find the recommended load index for your own car in the vehicle manual.

The Racing HD921 from Haida Tires is specially designed for summer use. Its compound and tread pattern are not suitable for winter weather conditions. This is just the basic difference between all season and summer tires.