The dimensions are stated on all car tyres. Example of designation:215/55R16 97W.
205 | Tyre width (mm) |
50 | Ratio between tyre wall height and tyre width (%) |
R | Radial ply |
17 | Rim diameter in inches (") |
93 | Codes for the maximum permitted tyre load, load index (LI) |
W | 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.