Promo Ceramic Speed 61903 (6903) Single Bearing For Hub Freehub CeramicSpeed Bearing 12x28x8mm #6001 #101199 CeramicSpeed 61903 Coated Bearing Premium Bicycle Headset Bearing CeramicSpeed 6903 Bearing (61903) for sale online eBay CeramicSpeed 61803 Standard Bearing (6803) FirstFlightBikes. Experience the pinnacle of performance with the CeramicSpeed 61903 Coated Bearing. Designed for cycling enthusiasts, this premium bearing offers exceptional durability and efficiency, ensuring a smooth ride every time. Grade 3 Silicon Nitride balls for superior performance Coated races enhance longevity and reduce wear Reinforced polyamide cage and non contact seal protect against dirt and moisture High resistance to inadequate lubrication for reliable operation Versatile design suitable for all cycling disciplines How to use Ideal for: The CeramicSpeed 61903 Coated Bearing is ideal for upgrading your bicycle headset. Simply replace your existing bearing with this premium option to enhance your bike's performance. Perfect for road cycling, mountain biking, or any cycling activity. Details: Bearing I. D.: 17 mm Manufacturer Number: 61903 (6903) coated Bearing O. D.: 30 mm Material: Ceramic Thickness: 7 mm Sold individually and hand built in Denmark. Limited Lifetime Warranty included.