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XB Wheel Bearing Kit, by Woodcraft Technologies.
Ceramic wheel bearings run with less friction and far less heat than steel, and they do not corrode. On a race bike they free up a small but real amount of drivetrain drag; on any bike they last considerably longer between changes.
Wheel bearings must be pressed in squarely with the correct tooling. This is a job worth having done properly.
Ships to the lower 48 and DC. Returns accepted on most items.