Size designation for wheel rim

Wheel and rim dimensions are designated in accordance with the examples in the table below.

All wheel rims have a dimension designations, for example: 8Jx18x42.5.

8Rim width in inches
JRim flange profile
18 Rim diameter in inches
42,5Off-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.