Type and specification of truck tires

Whether it is a truck, truck or car, the tire specifications are marked the same, in millimeters to indicate the percentage of section width and flat ratio.  Add to it: tire type number, rim diameter (in.), load index (allowable load mass number), allowable speed number.  Assume that the tire specification is 195/55/R16 85V;  

195 -- refers to the tire width of 195 mm, 55 -- refers to the tire flat ratio, that is, the cross section height is 55% of the width.  

R -- refers to radial tire (the inner layer of this tire is made of radial tire), 15 -- refers to rim diameter of 15 inches.  85 - Load index 85 means maximum load capacity of 515 kg, four tires is 515 x 4=2060 kg.