Shimano SG-8R20 Ball Retainer P (3/16" X 13) (Fits Shimano Nexus & Alfine Internally Geared Hubs)

Shimano SG-8R20 Ball Retainer P Description: The Shimano SG-8R20 Ball Retainer P consists of a bearing retainer stuffed with high quality, stainless steel ball bearings, and the size of this caged bearing is specifically sized to fit within Shimano Nexus and Alfine internally geared hubs. When performing routine cleaning and maintenance of the hub, replacing this bearing as part of the maintenance will improve the durability and lifespan of the hub and ensure optimal performance. Features: Bearing retainer ensures the ball bearings stay spaced apart so they won't bind up against each other during operation 13 stainless steel 3/16" ball bearings resist wear and corrosion and evenly disperse loads for less rolling resistance