American Classic Micro 58 (n.s Disc Nodisc) Front HUB Ceramic Bearing Inner Diameter - 2 3/4 inch (2.75") 5206ZZ Nachi Double Row Angular

5206ZZ Nachi Double Row Angular Ball Bearing and bearing is Double Shielded

the 6324ZZE inner diameter is 120mm

small gear trains

the 63/28 outer diameter is 68mm

American Classic Micro 58 (n.s Disc Nodisc) Front HUB Ceramic Bearing Inner Diameter - 2 3/4 inch (2.75") 5206ZZ Nachi Double Row AngularHybrid Ceramic Deep Groove ball Bearings (steel rings with ceramic balls) Fits American Classic Micro 58 (n. s Disc AND Nodisc) Front HUB Bicycle Closures: Rubber Sealed Closure Side: Double Sided Seals Lubrication: Low Friction Grease Material: Corrosion Resistant Chrome Steel Balls: Low Friction Solid Ultra Light Ceramic Balls Brand: VXB Quantity: Set of two Bearings Location : Front Hub