Tire size, type, and size, in millimeters, expressed as a percentage of cross-sectional width and flatness. Add: tire model code, rim diameter (inches), load index (allowable load-bearing mass code), and allowable speed code. Assuming tire size is 195/55/r1685v

195- refers to a tire width of 195 millimeters.

55- refers to the flatness ratio of the tire, which is 55% of the width at the cross-sectional height.

R indicates that the tire is a radial tire (the inner layer of the tire is made of radial tires)

15- refers to a wheel rim diameter of 15 inches.

85- Load index 85 represents the maximum load-bearing capacity of 515 kg, and the maximum load-bearing capacity of four tires is 515 × 4=2060 kg.

V - a speed level of 240 kilometers per hour.