When you see a marking like 83W on a tire’s sidewall, it tells you two important things about the tire’s capability — its load index and speed rating.

Load Index 83: This number indicates how much weight the tire can safely carry. A This load index means the tire can handle up to 486 kg (1071 lbs) per tire when properly inflated.

Speed Rating W: The letter shows the maximum speed the tire can safely sustain. It is designed to safely reach speeds of up to 270 km/h (168 mph).