All wheel rims have a dimension designations, for example: 8Jx18x42.5.
| 8 | Rim width in inches |
| J | Rim flange profile |
| 18 | Rim diameter in inches |
| 42,5 | Off-set in mm (distance from wheel centre to wheel contact surface against the hub) |
The car has an approval for the complete vehicle with certain combinations of wheel rims and tyres.