Dimension designation for wheel rim

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

The car has an approval for the complete vehicle with certain combinations of wheel rims and tyres.

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

8

Rim width in inches
JRim flange profile

18

Rim diameter in inches

42

Off-set in mm (distance from half wheel width to wheel contact surface against the hub)