What exactly are these? I believe that they are to fill the gap between the hub and the central bore of the wheel but Im not 100% on where they are put. Do they just sit on the hub itself?
Are they always needed when fitting alloys? I have some new alloys ariving later today but Im not sure whether there is a gap between the hub and the wheel - is there a certain allowable gap before a spigot ring is needed?
Thanks.