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Facing
From WikiPedalia
The process of finishing the flat surfaces of the frame and fork to which bearing assemblies attach. Correct facing of the head tube, fork crown, and bottom bracket shell ensures correct alignment of the headset and bottom bracket bearings. This is necessary to ensure good bearing performance and reliability.
Facing requires highly specialized milling equipment, among the most expensive of bicycle tools. Even minimal tools to do this job cost several hundred dollars.
