Chris King DropSet Replacement Bearings are made in-house at Chris King's Portland, Oregon facility using the same angular-contact, heat-treated construction as the originals, so the headset returns to factory spec rather than stepping down to a generic replacement. Sizes run 41mm for DropSet 3, 42mm for DropSet 2 and 4, and 52mm for DropSet 2 and 3 positions, with steel and ceramic options across the range to match whatever the original build called for.