The dimensions are stated on all car tyres. Example of designation:215/55R16 97W.
Tyre width (mm)
Ratio between tyre wall height and tyre width (%)
Rim diameter in inches (")
Codes for the maximum permitted tyre load, load index (LI)
Speed rating for maximum permitted speed, speed rating (SS). (In this case 270 km/h (168 mph)).
The car has an approval for the complete vehicle with certain combinations of wheel rims and tyres.