Whether it is a truck, truck or car, the size of a tyre is the same, in millimeters as a percentage of cross section width and flat ratio. Add: tire type code, rim diameter (in.), load index (allowable load quality code), allowable speed code.
Assume the tire size is 195/55/R16 85V;
195 -- refers to the tire width of 195 mm, 55 -- refers to the tire flat ratio, that is, section height is 55% of the width.
R - refers to the radial tire (the inner layer of this tire is made with radiation), and 15 - refers to the rim diameter of 15 inches. 85 -- The load index 85 represents the maximum load-bearing capacity of 515kg. Four tires are 515×4= 2060kg.