What is the meaning of the car wheel? For example, 255/55 R18; behind the R18 is the diameter of it, is the whole tire or wheel hub?
Example: P215 / 60R18 89H "P" refers to car tires. (To distinguish tires for trucks or other models) "215" means the width of the tire section, the width (in millimeters) between the two sidewalls. This width varies with the width of the rims matched by the tires: wide rims with wide tires, narrow rims with narrow tires. The width of the tire, which is generally marked on the sidewall, refers to the width of the tire when the tire is mounted to the desired width of the rim. "60" is the flat ratio of the tire, the width of the tire width and the height of the tire, where the tire height accounted for 65% of the width of the tire, the smaller the value, the more flat. "R" refers to the structure of the tire, indicating that the tire is a meridian structure, that is to say its ply is arranged in the carcass. "B" means that the tire is a skew structure, the current skewed car tires have ceased to exist. "18" indicates the rim diameter (in inches), the tire must match the 18-inch rim, otherwise it can not be installed. "89" indicates the load index: This tire has a maximum load of 1,279 pounds. Different load indices represent different maximum loads (usually in pounds or kilograms). "H" indicates the speed level: the maximum speed of the tire is 130 miles per hour. The old European bead marking system is indicated by 215 / 65HR15. Different English letters indicate different speed levels.
Tire type and specification: International standard tire code, expressed in millimeters as a percentage of section height and flatness, followed by: tire type code, rim diameter (inch), load index (permitting bearing quality code), promise With speed code. For example: 175 / 70R 14 77H 175 represents the tire width is 175MM, 70 means that the flatness of the tire cross section is 70%, that is, the cross section height is 70% of the width, the rim diameter is 14 inches, the load index 77, the allowable vehicle speed is H level
