The wheel rim 'offset' is the distance between the centre line of the rim and the faceplate that bolts onto the hub. It is important to know as different offsets will alter the distance between the inside edge of the rim and the side of the trailer or caravan. It could also increase the overall width of the axle and it may also alter the capacity of a suspension system.
Start by placing the rim on a level surface with the front of the mounting plate facing upwards, then measure the distance 'A' (in millimetres) from the mounting plate edge to the surface.
Please Click Here If you need to find the PCD of the wheel rim.