Answer BMX Alumilite Ti Mini Cassette Rear HUB Ceramic Bearing Inner Diameter - 0.3 inch (0.3") Equal: 6021 ZZ / 6021

Equal: 6021 ZZ / 6021 2Z

Outer Ring Tolerance: 0~-35

S6306-2RS bearing is made from stainless steel and Stainless steel cage

Equal NTN 6308ZZ

6218ZZENR Nachi Bearing with a Snap Ring

Answer BMX Alumilite Ti Mini Cassette Rear HUB Ceramic Bearing Inner Diameter - 0.3 inch (0.3") Equal: 6021 ZZ / 6021Hybrid Ceramic Deep Groove ball Bearings (steel rings with ceramic balls) Fits Answer BMX Alumilite Ti Mini Cassette Rear 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 4 Bearings Location : Rear Hub