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@deleted
moose cycles.
the area of contact on a king is very small and quite a shallow angle, hold the race and bottom bearing cup together in your hands and notice how easy it is to move them side to side.
this will show why they should be faced.
when fitted to the bike have a look how narrow the gap is between top cap and race, any change in angle between top and bottom cups will be seen by the change in this gap, a small offset will meant the top cap rubbing and premature bearing wear.