Originally posted by Scooby:
The wheel centre bore needs to be bigger so it fits over the hub, the wheel wont centralise properly and it will cause a vibration. You can buy a spiggot to take up the differance.
I would have thought with the bolt being tapered and the holes aswell it should pull central with them, i always thought they were to make it easier when lining the holes up i:e something to support the wheel