3. What is the correct tire dimension for this car?
Check the vehicle registration certificate, under the column “Aksler / dekk / felger”, and see that the dimensions correspond to what is written on the side of the tires.
The vehicle card states that standard tire dimensions on axles 1 and 2 are 215/65R16
On the tire it says that the tire dimension is 215 / 55R18
This is what the marks on the tires mean:
215 stands for tire width in millimeters.
55 is the height of the tire as a percentage of width.
R stands for radial, and explains how the tire is constructed.
18 stands for the rim diameter in inches.
99 is load class, how much weight the tire can carry.
V is speed code. This tells the limit of how fast the tire is designed to drive.
In addition, the tires are marked m · s if they are winter tires.
The vehicle registration certificate states that there are alternative tire and rim dimensions you can use on this car. This means that the tire dimensions of this car are correct.
The deviation in rolling circumference can be a maximum of + -5% in relation to the standard tire dimension stated in the vehicle registration certificate. If you choose to increase the height of the rim, you must also reduce the height of the tire (lower profile).