centre bore is the diametre of the flange on the hub, the actuall part the wheels fit snug agaisnt. 57.1mm
Offset is figured out by measuring where the mounting point of the alloy sits in relation to the inner edge of the wheel?
so if the offset is Zero where it mounts will be where the inner edge of the alloy is? making the rest of the wheel stick outwards?
...*waits to be corrected*