Experience superior performance with this premium 6806 2RS hybrid ceramic ball bearing. Featuring a robust chrome steel ring construction and advanced silicon nitride ceramic balls, this bearing delivers exceptional durability and smooth operation. The precision-engineered design boasts a 30mm inner diameter, 42mm outer diameter, and 7mm width, making it ideal for high-speed applications, particularly in bicycle components. Both sides are rubber-sealed to protect against dust and debris, while the nylon cage ensures optimal ball spacing and reduced friction. The bearing comes pre-lubricated with high-quality grease for immediate use. The combination of ceramic balls and steel rings offers remarkable advantages including reduced weight, outstanding wear resistance, and excellent performance in demanding conditions. This thin-section bearing is particularly well-suited for applications requiring high precision and reliability. Perfect for upgrading your bicycle's bearing system or other precision mechanical applications requiring a 30mm bore diameter.