Tyres - dimensions

The car's wheels (wheel rims) and tyres have a certain dimension, see the examples in the table below.

The car has an approval for the complete vehicle. This means that certain combinations of wheels (wheel rims) and tyres are approved.

The dimensions are stated on all car tyres. Example of designation:235/45R17 97W.

235Tyre width (mm)
45Ratio between tyre wall height and tyre width (%)
RRadial ply
17Rim diameter in inches (")
97Codes for the maximum permitted tyre load, tyre load index (LI)
WSpeed rating for maximum permitted speed, speed rating (SS). (In this case 270 km/h.)