Enduro Flanged Rubber Sealed Deep Groove Ball Bearings: A commonly used bearing, these types are manufactured with rubber seals inserted into the outer raceway and in contact with the inner race providing protection against the ingress of moisture, dust and other foreign matter and serve to retain the pre-filled grease in the bearing. The have a larger diameter flange on one side of the bearing making it ideal to press into housings, once its fully pressed it will stop against the shoulder of the flange. Typically found in cycle wheel cranks and suspension systems.
Seals can be easily removed for applications that only require 1 seal. Benefits: Prevents moisture and dirt getting into the bearing, lubricated for life
Note: These bearings may feature 'C3' on the box, this is not in reference to internal clearance and is a manufacturer code.