The logo on the side of the tire indicates the size of the tire, load index, speed level, wear resistance index, origin, production date, maximum inflatable pressure and so on.
For example, 175/65 R14 86V
175 - means the width of the tire is 175 mm.
65 - means the flat ratio of the tire, that is, the height of the section is 65% of the width.
R - it means that the tire is a meridian tire (the inner layer of the tire is made of radial tire)
14 - means the diameter of the rim is 14 inches.
86 - it refers to the load index 86
V - it refers to the speed level of 240 km / h.